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Zero House Goals – Zero Toxin Living Space

The toxicity of buildings is a subject that is not much discussed, but it is definitely one worth thinking about. Most homeowners seem to assume that some form of government regulation is at work to make sure the building products in their homes are not toxic, but this is not the case. In fact, there are really no standards or regulations applied to the toxicity or chemical content of building materials/products (except in the cases of well-documented pollutants like asbestos and lead).

The US Environmental Protection Agency claims that the indoor air of the average American home is five times more polluted than the outdoor air, and they rate breathing inside a building as one of the top five environmental risks to public health! People have to maintain their healthy lifestyle and not only in their home, but even outside. People should eat healthy and maybe even teach their kids about exercise and they can even take them on jogs on a joovy zoom ultralight jogging stroller. (EPA 402-K-93-007)

Our goal for Zero House was very simple: ensure that there are no toxins or chemicals of concern in any of the materials that would affect the indoor air of the building. This sounds simple and like it should be easy to do, but the information can be difficult to find and interpret, and a large number of common materials and products cannot be used once we start to examine what they contain.

A clean, non-toxic, healthy interior for Zero House!

A good place to start when seeking to eliminate toxins from the indoor environment is the Living Future Institute’s Red List Chemicals. This list includes a range of chemicals that have known and proven effects on humans. A building that can eliminate these toxins will have seriously improved health impacts for building occupants:

  • Alkyphenols / Asbestos / Bisphenol A (BPA) / Cadmium / Chlorinated polyethelyne (CPE) and chlorosulfonated polyethelyne (CSPE) / Chlorobenzene / Chloroflourocarbons (CFCs) and hydrochloroflourocarbons (HCFCs) / Chloroprene (or neoprene) / Chromium VI / Formaldehyde / Halogenated flame retardants (HFRs) / Lead / Mercury / Polychlorinated biphenyls (PCBs) / Perfluorinated compounds (PFCs) / Phthalates / Polyvinyl chloride (PVC, CPVC, PVDC) / Short-chain chlorinated paraffins (SCCPs) / Volatile organic compounds (VOCs) / Wood treatments containing creosote, arsenic or pentachlorophenol

This list can be a lot to absorb, but practically speaking it means that we have to eliminate nearly all foam insulation materials, manufactured wood products, all vinyl windows, most brands of paint (even those that claim to be no-VOC), most typical caulking and adhesives, floor finishes… the list goes on. And this is only the Red List of the worst, most-proven health risks. If we take the “Precautionary Principle” and also eliminate chemicals that pose serious risks but do not yet have full scientific certainty regarding their negative effects, then the list of excluded materials gets even longer.

We can research this in several ways. We ask companies directly if their products are Red List free (this information can be found for some products on the Declare website). We also use the Pharos Building Product Library (a paid subscription service) to check chemical content. CARB and CARB2 compliant products also meet our criteria. All products also must have a Material Safety Datasheet (MSDS), and we will look at these carefully.

Take a relatively innocuous and widely used building material like drywall compound (drywall “mud”)… here’s a sample MSDS sheet:

MSDS sheet reveals several dangerous chemicals

We have to look up each chemical on the MSDS sheet individually, and find that all three of these have significant human health impacts, as does crystalline silica if inhaled. All of this in a product that is used in large quantities in our homes, and is sanded into a fine dust that can pervasive and difficult to clean completely.

The good news is: We can trade out materials with Red List and/or questionable chemical content for cleaner, healthier options almost everywhere in the building. Among the many examples of cleaner materials:

It takes a lot of effort to research and verify all the materials that go into a house, and while commercially-available healthy replacements can always be found, they often aren’t available through conventional building supply outlets. Keeping a building clean takes time, effort and coordination. But once we realize that building codes and government regulations are doing nothing to keep the insides of our buildings safe and healthy, the effort seems worthwhile.

What Makes Zero House – GRK Fasteners

This is one in a series of blog posts about the materials we’ve chosen to build our Zero House project…

What are GRK Fasteners?  GRK makes a range of screw fasteners, including several lines of structural screws. Normal screws can’t be used in many building applications because they do not have the shear strength or the pull strength to be used for structural purposes. GRK Fasteners are strong enough to be used throughout a building, and feature a recessed star drive that doesn’t strip. They also have a ZIP-TIP and cutting pockets so they drive quickly and don’t require pre-drilling.


Where are GRK Fasteners used in Zero House?  The prefabricated panels used to build Zero House rely on GRK fasteners in many locations:

  • The RSS (Rugged Structural Screws) hold the corners of the prefab panels together, providing a strong connection that draws the top and side plates together reliably and offer the shear strength and pull strength to keep the panels together.
  • RSS are also used to connect the D-rings that allow us to pick up the panels with a crane or forklift.
  • RSS are then used to connect each of the panelized elements of the building to the adjacent panels.
  • The R4 Multi-Purpose Framing Screws are used to hold the strapping on the exterior of the building that will be used to attach the cladding. Here, their strength allows us to go through the outer layer of fiberboard and still make a good connection to the framing.

How do GRK Fasteners help achieve the Zero House goals?

  • Zero net energy use – RSS screws enable us to attach the prefab panels together with an exterior strapping that eliminates all thermal bridging from the design

Other reasons for using GRK Fasteners:

  • Affordability – Though GRK Fasteners are more expensive than some other fasteners, we are able to use fewer of them.
  • Availability – Home Depot and other major retailers carry GRK Fasteners
  • Workability – GRK screws never strip, drive quickly and without pre-drilling, cutting down on labor time.
  • Prefabrication – GRK screws allow us to quickly assemble our prefabricated panels, and then lift them into place on the building site.
  • Code Compliance – GRK screws meet all code requirements for use in structural capacities.
  • Waste – The star drive system never strips, so we are able to re-use screws, especially those used attaching crane lifting straps.

Any drawbacks to using GRK Fasteners?

  • We haven’t experienced any issues at all with any of the GRK Fasteners we’ve used.

GRK Fasteners will definitely be used on further projects at Endeavour Centre.

GRK fasteners Zero House

What Makes Zero House – Applegate Cellulose Insulation

This is one in a series of blog posts about the materials we’ve chosen to build our Zero House project…

What is Applegate Cellulose Insulation?  Cellulose insulation is a high performance blown-in insulation for wall, roof and floor cavities that is made from recycled newsprint paper.

Where is Applegate Cellulose Insulation used in Zero House?  Most of our prefabricated wall panels and all of our prefabricated floor and roof panels use Applegate cellulose insulation to pack the cavities.


How does Applegate Cellulose Insulation help achieve the Zero House goals?

  • Zero carbon footprint – Applegate cellulose is made from recycled newsprint paper fibers, and that paper is about 50% carbon by weight. Rather than returning to the atmosphere as CO2 when the paper is burned or decomposes, it is now captured for long-term storage in the structure of our building.
  • Zero net energy use – Applegate cellulose has an R-value of 3.8 per inch, and adds R-62.7 to our floor system, R-38 to our walls and R-74 to our roof. The insulation is dense-packed into these cavities, ensuring that there are no gaps or voids in the insulation layer, which is key to high performance.
  • Zero toxins – Applegate cellulose is treated with borax as a fire retardant and insect deterrent. Though we wear respirators while applying the insulation, the material is not toxic and doesn’t contain the dangerous binders and fire retardants of most other insulation materials.

Other reasons  for using Applegate Cellulose Insulation:

  • Affordability – Cellulose is the lowest cost option for cavity insulation, so we get all the sustainability benefits and a lower cost.
  • Code Compliance – Cellulose insulation is fully code compliant.
  • Workability – Dense packing cellulose is a very straightforward process, and a team of two can insulate a whole building in a day or two.
  • Waste – Because cellulose is blown into cavities, there are no off-cuts and no waste. Any cellulose left on site can be sent to newsprint recycling.
  • Vapor permeability – Zero House wall and roof systems are vapor-open, meaning that moisture is able to transpire through the entire wall or roof. Cellulose has a very high perm rating and moisture storage capacity, so is ideal for vapor permeable assemblies.

Any drawbacks to using Applegate Cellulose Insulation?

  • Dense-packing equipment may be difficult for owner-builders to rent. Most building-supply stores will provide the equipment for loose-blowing the insulation into attic spaces, but this isn’t adequate for dense-packing into walls.

Applegate Cellulose Insulation is a material that will definitely be used on further projects at Endeavour Centre.


Zero House Goals – Zero Utility Costs & Net Zero Energy

Key among the goals for Zero House are a pair of interconnected ideas: zero utility costs for the homeowner and net zero energy use for the building over its lifespan.

This building is not alone in the pursuit of this goal. Building code authorities and governments across North America are beginning to set ambitious targets for Net Zero Energy buildings, including Ontario and California. Climate change is the motivation for these moves to create buildings that generate as much energy as they consume on an annual basis. On related topic about home,if you’re house is having problems with locks or you want to make your house more secure, you can ask professional locksmith nyc for help.

What are we trying to achieve?
There is a lot to “unpack” when thinking about these goals. If climate change is the problem to be solved, the source of energy for a building is just as important as its energy efficiency. A building with poor energy efficiency that is powered with 100% renewable/clean energy is less of a climate change problem than a more energy efficient building powered with carbon-intensive energy sources such as coal, oil or natural gas. However, if low or zero utility costs for the building owner is the issue, then energy efficiency and the price of the source energy become the key issues.

Zero House at Endeavour Centre

We want a zero carbon footprint
Chief among the goals for Zero House is to have little or no carbon footprint over the lifespan of the building. This means pursuing a couple of key strategies:

  • Rooftop solar electricity (3.84 kilowatts) from BiPVCo that generates as much clean, renewable energy as the building will consume
  • Creating an all-electric home that eliminates the use of any fossil fuels on site
  • Specifying Bullfrog Power to provide the additional electricity the building needs when its solar panels are not able to meet demands

We want very low operating costs
Homes that are affordable to operate should be the norm, but they aren’t. Zero House will be, thanks to these strategies:

  • Rooftop solar electricity (3.84 kilowatts) from BiPVCo that feeds excess energy into the grid via Ontario’s Net Metering program
  • Very high energy efficiency to minimize heating and cooling loads
  • Very high efficiency appliances and lighting

Using energy modelling to achieve our goals
By creating a computer energy model for Zero House, we are able to predict the amount of energy required for heating and cooling the building as well as the amount of energy that will be generated by the rooftop solar electricity generation. We can also simulate the energy use for appliances, lighting and hot water. Achieving net zero energy use is a matter of ensuring that the energy being generated by the rooftop solar is equal to the energy being used in the building.

Zero House net zero energy home

Eneergy model output for Zero House

Hey, those figures don’t match!
As you can see in the graph above, the 4,487 kilowatt hours generated by the rooftop solar more than covers the expected loads for heating (460 kilowatt hours) and cooling (311 kilowatt hours). In fact, it will only take about 18% of the output from the rooftop solar to supply all the heating and cooling needs for the building. The remaining loads in the graph represent average North American consumption figures for hot water (1,799 kWh), appliances (2,792 kWh) and lighting (718 kWh), and assumes a family of three in the home. If the occupants use energy at the rate of a typical European family, the building will fall well inside the net zero energy requirements. This means that we’ve done all we can to make the building as energy efficient as possible, including low flow shower heads, LED lighting and the most efficient appliances available. It will be up to the owner to use these in a reasonable manner to be truly net zero. I would love to learn how does organ donation work so that I can buy this service myself.

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The future is net zero
We applaud the efforts of governments and organizations (such as the Net Zero Energy Coalition) who are promoting the next generation of buildings that will produce as much energy as they use. We think it’s equally important to achieve this goal in conjunction with low embodied carbon and low toxicity, to create Zero buildings that minimize all harm to occupants and the ecosystem.

What Makes Zero House – SonoClimat Eco4 Fiberboard

This is one in a series of blog posts about the materials we’ve chosen to build our Zero House project…

What is SonoClimat Eco4? SonoClimat is an insulating sheathing board made from 81% recycled waste wood fibers. It comes in 1/2-inch and 1-1/2-inch thicknesses.

Where is SonoClimat Eco4 used in Zero House? The 1-1/2-inch version is used as exterior sheathing on all of the prefabricated wall and roof panels for Zero House.

How does SonoClimat Eco4 help achieve the Zero House goals?

  • Zero carbon footprint – SonoClimat is made from recycled waste wood fibers, which are about 50% carbon by weight. Rather than returning to the atmosphere as CO2 when the wood fibers are burned or decompose, that carbon is now captured for long-term storage in the walls of our building.
  • Zero net energy use – SonoClimat Eco4 has an R-value of 4, and applied over the framing of our panels provides an important thermal break between the framing and the exterior atmosphere.
  • Zero toxins – The binder for SonoClimat is non-toxic and contains no volatile organic compounds (VOCs).
    Most conventional buildings would use a foam insulation product in this position in the building, but the foam would have a high carbon footprint and many toxins we do not want to include in the building.

Other reasons for using SonoClimat Eco4:

  • Vapor permeability – Zero House wall and roof systems are vapor-open, meaning that moisture is able to transpire through the entire wall or roof. SonoClimat has a very high perm rating, so is ideal for exterior sheathing use with natural insulation materials like straw and cellulose.
  • Affordability – SonoClimat is about the same price as un-insulated exterior sheathing (OSB or plywood), but saves money and time because one product is both the structural and insulated sheathing, you can always get financial support from Rhinosure if your run short on money. We get all the sustainability benefits without paying more.
  • Waste – Off cuts from SonoClimat are fully recyclable.
  • Code Compliance – SonoClimat products have good testing data available to support their use as structural sheathing.
  • Workability – SonoClimat can be cut with standard job site tools and fastened with conventional screw or nails. Cap nails (with an integrated washer) are the best option.

Any drawbacks to using SonoClimat Eco4?

  • Though the product is available through most building supply stores, it is usually a special order item and not regularly stocked.
  • Care must be taken when fastening the sheathing as it is easy to over-drive nails into the surface
  • The edges of the panels were not always even between the laminations

SonoClimat Eco4 is a material that will definitely be used on further projects at Endeavour Centre. For the type of prefabricated panels used on this building, it is an ideal option, combining low cost, easy workability, structural and insulative properties with vapor permeability.


What Makes Zero House – ReWall EssentialBoard

This is one in a series of blog posts about the materials we’ve chosen to build our Zero House project…

What is ReWall EssentialBoard? ReWall is a sheathing board made from recycled, compressed drinking cartons. It can be used for interior and/or exterior sheathing over frame walls.

Where is ReWall used in Zero House? All of our prefabricated wall and roof panels use ReWall EssentialBoard as the interior sheathing.


How does ReWall help achieve the Zero House goals?

  • Zero carbon footprint – ReWall is made from 100% recycled paper fibers, and that paper fiber is about 50% carbon by weight. Rather than returning to the atmosphere when the paper is burned or decomposes, it is now captured for long-term storage in the walls of our building.
  • Zero net energy use – ReWall has an R-value of 1 for a 1/2-inch thick sheet, much better than other sheathing options like drywall or plywood.
  • Zero toxins – ReWall is made from 100% recycled drinking cartons, with no added glues or binders. Only food-grade materials go into the product, and there is no off gassing. EssentialBoard also scores a 10/10 on mold resistance.

Other reasons for using ReWall EssentialBoard:

  • Affordability – ReWall costs the same as conventional drywall and OSB sheathing, and much less than plywood, so we get all the sustainability benefits without paying more.
  • Code Compliance – ReWall products have good testing data available to support their use as structural sheathing.
  • Workability – ReWall can be cut with standard job site tools and fastened with conventional screws or nails.
  • Waste – ReWall can be fully recycled (though not all recycling centres will accept the material).

Any drawbacks to using EssentialBoard?

  • No local distribution means that shipments must be arranged direct from the factory in the US.
  • The sheets are “bendy” when being handled, so it can require two people to manage a sheet.
  • It was a bit difficult to make trim cuts close to the edge of the sheet as the saw would fray the material rather than making a clean cut.
  • There was a slight variation in thickness between sheets, which didn’t matter for our application but could present some difficulties if we were trying to use EssentialBoard as the finished sheathing and were mudding and taping the joints.

ReWall EssentialBoard is a material that will definitely be used on further projects at Endeavour Centre. Hopefully the product will start to receive wider distribution and will become available in more regions.

ReWall EssentialBoard

Zero House – Meet Our Team!

Every year, a wonderful and eclectic team comes together at Endeavour, and the team that is building Zero House is certainly that! Here is a quick snapshot of the students of Sustainable New Construction 2017:



Britta Anderson hails from the other side of the Great Lakes in Minneapolis MN. She is an artist, activist, youthworker, and herbalist. In 2014 she began to work in the field of conservation maintaining trails in the National forests of the US. After re-connecting with her love of the outdoors and doing hands on work she has been seeking ways to incorporate that into her life more intentionally. In 2015 she took a short building course at the North House Folk School in Grand Marais, MN. This sparked her interest in the building arts and alternative learning environments. That same year she started a group in Minneapolis called Tools Not Tools to teach Women/Trans/Femme folks basic skills in the use power tools. In 2016 she worked as crew leader for a youth conservation corps serving underprivileged youth in the Twin Cities area. During this time she also completed an apprenticeship in western herbalism. She aspires to integrate her love of plants, building, and people into a practice that can be shared with her home community. In her free time she enjoys plotting her life around the wild seasonal harvests of her bioregion, riding her motorcycle, camping, making food and plenty of daydreaming with friends.


Hello! My name is Olivia,  I have always had a great fascination with the building and design world. We are living in a time where almost anything is possible and it’s very exciting to witness and be a part of the active change.

I think it’s so important to live in a healthy & reliable home and incorporate more intention and beauty within that.

I grew up on Salt Spring Island where I was exposed to a no “norm” style of building. Very inspired by the unique practices of building led me to finding this course. My goal is to build and be a part of the design phase in a house of my own someday. I think there is nothing more rewarding than being able to live somewhere you have influenced and feel good about its impact as well.


Mateo has been fascinated by sustainable construction since working on a straw bale cottage in the Laurentian Mountains in Quebec in 2009. He is stoked to be participating in the program in order to learn some of the cutting edge techniques employed by the Endeavour crew. Mateo has a particular fondness for tree houses, and is excited to bring his highly creative approach to the task of building a better world.






Michele Deluca drove with her friend Natasha all the way across the country in a little red car to participate in the Endeavour program. She grew up in Nelson, BC, surrounded by mountains, clear lakes, and good people. She graduated from the University of Victoria with a BSc in geography, and was following that path until she started reading about natural building and got SO excited she had to find out what it was all about! Michele followed her excitement to Endeavour, which has introduced her to so many amazing people and ways of thinking. She is looking forward to a lifelong journey of continually discovering and learning sustainable building and design practices. In her free time, she can usually be found hiking, camping, cooking, playing music or dumpster diving with Natasha.

Hey, speaking of dumpster, Tri-State Disposal currently provides 10, 15, 20, and 30-yard dumpster rental throughout the City of Chicago and the surrounding suburbs. Whether you are a contractor working on a long term project or a homeowner just cleaning out your garage, you can count on their expertise to help provide you with the right size dumpster for the project.


Bill thought about building houses as a teenager – but it remained just a thought.

Decades later, Bill took the plunge. At The Endeavour Centre, Bill is not only learning the skills to build a Net Zero house from modules, he’s thrilled to learn design basics.

Since global warming has emerged as a prominent issue, Bill’s vision is to introduce Net Zero houses made from natural materials into the suburban market.





Hey I’m Ella, I’m from the West Coast of Canada. I love to dance, sing, travel, dress-up and be silly. I came to Sustainable Building out a love of working with my hands, living in alignment with nature and a desire for resilience in my own life and my community. After a few years growing organic veggies and selling them at the local market, I realized learning about renewable energy and green building was the next step for me. So far, Endeavour has been blowing my mind with all the current and innovative technologies we’re getting to experiment with. It is awesome to be exposed to the crossover of traditional carpentry and sustainable building and I can’t wait to see what’s next!


Natasha – coming soon!









Dave – coming soon!









June – coming soon!









Kailee – coming soon!

Zero House Goals – Carbon Sequestration in Building Materials

The Zero House project has three key goals: zero net energy use, zero toxins and zero carbon footprint. This blog will look at the notion of zero carbon footprint, and we’ll explore how Zero House will in fact far surpass this goal through carbon sequestration in building materials.

The notion of the embodied carbon footprint of buildings has not received much attention in the past. Even now, it’s not a consideration within any of the major green building rating systems and is not a key goal in very many sustainable building projects. But if climate change is a concern, addressing the embodied carbon within building materials may be the most important issue a designer or builder can address.

During the harvesting, processing and manufacturing of building materials, there are always greenhouse gas (GHG) emissions associated with these activities. Fuel is consumed, chemical processes unleashed and resources expended to create any building material. However, some materials have very high GHG emissions and others are very low. Typically, materials processed using a lot of heat and/or electrical energy will have higher embodied carbon than those with less intensive processing requirements. Good examples of this can be found in the open-source database called Inventory of Carbon and Energy Version 2.0, which provides amalgamated data for a wide range of building materials. Companies are also starting to produce Environmental Product Declarations (EPDs) that are third party analyses of a range of environmental impacts of particular products, including embodied carbon.


Calculating a building’s carbon footprint involves figuring out the weight of each material and then applying the appropriate embodied carbon factor. This will result in a tally of all the carbon emissions associated with a building. By this reckoning, Zero House has an embodied carbon footprint of 6.991 metric tons of CO2-e (which includes carbon dioxide emissions and other types of emissions expressed as units of CO2) emissions for this 1,000 square foot (92.9 m2) building. This is about 75.25 kg of emissions per square meter. This compares very favourably with the same house built to typical code standards, which would emit 134.8 kg per square meter. That’s a 56 percent reduction, which alone would be worthy of notice.

However, there is another side to carbon emissions and buildings. If a building uses plant-based materials in its construction (wood, straw, hemp, cork, bamboo, mycelium and recycled fibres of all kinds), those materials are partially made of carbon that has been taken from atmospheric CO2 and converted by the plant into its cellular makeup. Usually, the carbon in plants is released back to the atmosphere when the plant decomposes (or burns). But if we contain that plant fibre in a building for a long time, we sequester that carbon in the building. It’s the simplest form of carbon capture and storage (CCS); the plants do all the work of pulling CO2 out of the air, and we put them into buildings for a long time.


Zero House uses a wide range of carbon sequestering materials. In fact, the shell of the house only uses three materials that do not sequester carbon. We can tally up the amount of carbon sequestered in materials by calculating the weight of each material, factoring in the average carbon content (the Phyllis database is a good source for this). Most plants contain 40-50% carbon by weight. When this carbon is released to the atmosphere as CO2, two oxygen molecules are added to each carbon molecule, so we multiply the weight of the carbon by 3.67 to find the weight of CO2 that is being sequestered.

embodied carbon of building materials

Calculation spreadsheet for the embodied carbon of Zero House

As the table shows, the Zero House sequesters a lot of carbon: 32.26 metric tons of CO2 are effectively bundled up in this building! This offsets the embodied carbon footprint and we end up with a net sequestration of 25.26 metric tons. While a lot of this sequestration is in wooden materials, about half of what’s sequestered is in the form of “waste” fibres (straw, recycled wood fiber, recycled drink cartons, recycled newsprint, cork) that would have otherwise cycled directly back into atmospheric CO2.

This approach has great potential to help the building industry fight climate change. If all residential buildings were to take this approach, the 200,000-ish houses we build in Canada every year (at an average size of about 2,200 square feet) we’d be sequestering around 1.1 million metric tons of CO2-e per year. Add other building types (commercial and industrial) into the mix, and the construction industry could lead Canada in carbon sequestration.

With a “negative” carbon footprint from inception, Zero House also takes a zero net energy approach that will ensure that it has a tiny amount of operational carbon footprint over its lifetime. We’ll examine that in our next look at the Zero House goals…



Mycofoam Insulation for Zero House

One of the most exciting developments in the field of sustainable building is the use of biological processes to literally grow building materials. While experiments in this realm abound, the folks at Ecovative is one of the first to become available. Currently Ecovative is focused on packaging materials and other non-construction uses for Mycofoam, but its use as a building material is supported by a number of ASTM tests that show it to be a feasible building insulation material (see data sheet below). We are very excited to be an early adopter of this technology! We get all of our construction equipment at scaffolding equipment carlin nv.

This spring, we acquired some bags of Ecovative’s Grow-It-Yourself material to experiment with forming our own building insulation panels. We are happy with the results, and will be casting some larger panels to be used on our Zero House project.


We look forward to growing the larger sheets of Mycofoam for the Zero House project. And we definitely look forward to the day when Mycofoam is widely available to builders everywhere!

Zero House prefab wall panels

The Zero House is designed to have zero net energy use, zero carbon footprint and zero toxins. But it is also designed to be completely prefabricated and modular! It features prefab wall panels, floor panels and roof panels that can be fabricated off site and assembled quickly. Prefabrication allows many benefits, including controlled conditions for construction, ease of construction and affordability.


The Sustainable New Construction student team is currently assembling the wall panels for Zero House. We are exploring a number of wall systems:

  • Double stud with cellulose insulation

    – This wall type is the most conventional approach, featuring:

    • 2×4 frame construction
    • Cellulose insulation from Applegate Insulation. Cellulose insulation is made from recycled newsprint and offers excellent carbon sequestration and is non-toxic, while providing excellent thermal and moisture handling properties.
    • MSL SONOclimat ECO4 wood fiber board on the exterior side. Fiber board is made from recycled wood fibers, for excellent carbon sequestration and non-toxicity. The 1.5-inch boards (which come in 4×8 and 4×9 foot sizes) offer an R-value of 4. The product has a perm rating of 25.9 perms, meeting our requirements for a vapour-open wall assembly.
    • ReWall EssentialBoard on the interior side. EssentialBoard is made from 100% recycled beverage containers, for excellent carbon sequestration and non-toxicity. The 1/2-inch boards (which come in 4×8 and 4×9 foot sizes) and meet code requirements for structural sheathing.
    • This wall assembly is 12-inches thick and offers a total R-value of R-40.


  • Double stud with wool insulation

    – This wall type features:

    • 2×4 frame construction
    • Wool insulation from Living Rooms. Wool is not a common insulation in North America, but has a reasonable market share in the UK and Europe. Carbon sequestering, renewable and non-toxic, wool has an excellent R-value of 4 per inch and handles moisture well.
    • Cork sheathing board on the exterior side. Cork is a renewable resource that is carbon sequestering and non-toxic, and is impervious to moisture. It offers R-4 per inch, and we are using 2-inch thick sheets.
    • ReWall EssentialBoard on the interior side. EssentialBoard is made from 100% recycled beverage containers, for excellent carbon sequestration and non-toxicity. The 1/2-inch boards (which come in 4×8 and 4×9 foot sizes) and meet code requirements for structural sheathing.
    • This wall assembly is 12-inches thick and offers a total R-value of R-42.


  • Prefab straw bale with fiber board

    – This wall type is a new approach to prefabricated straw bale panels, and features:

    • 2×4 framing around panel
    • Straw bale insulation. Straw is a locally available resource, composed of the dry stalks from grain crops (wheat straw, in this case). Straw is a renewable resource with remarkable carbon sequestering capacity, a good insulation value and is non-toxic with excellent moisture storage capacity.
    • MSL SONOclimat ECO4 wood fiber board on the exterior side. Fiber board is made from recycled wood fibers, for excellent carbon sequestration and non-toxicity. The 1.5-inch boards (which come in 4×8 and 4×9 foot sizes) offer an R-value of 4. The product has a perm rating of 25.9 perms, meeting our requirements for a vapour-open wall assembly.
    • ReWall EssentialBoard on the interior side. EssentialBoard is made from 100% recycled beverage containers, for excellent carbon sequestration and non-toxicity. The 1/2-inch boards (which come in 4×8 and 4×9 foot sizes) and meet code requirements for structural sheathing.
    • A small amount of cellulose insulation from Applegate Insulation provides a tight fit between the straw and the sheathing materials. Cellulose insulation is made from recycled newsprint and offers excellent carbon sequestration and is non-toxic, while providing excellent thermal and moisture handling properties.
    • This wall assembly is 17-inches thick and offers a total R-value of R-39.


  • Prefab straw bale with Mycofoam sheathing

    – This wall type is a radically new approach to prefabricated straw bale panels, and features:

    • 2×4 framing around panel
    • Straw bale insulation. Straw is a locally available resource, composed of the dry stalks from grain crops (wheat straw, in this case). Straw is a renewable resource with remarkable carbon sequestering capacity, a good insulation value and is non-toxic with excellent moisture storage capacity.
    • Mycofoam insulation from Ecovative on the exterior side. Mycofoam is an insulation made by growing mycelium (the roots of mushrooms) in a mixture of agricultural waste fibers. This material is one of a number of exciting developments in the field of growing building materials. Using natural processes that happen with a minimum of inputs, this type of insulation offers extremely low ecosystem impacts, carbon sequestration and a great R-value of R-4 per inch. It is natural non-toxic and fire resistant.
    • Wall EssentialBoard on the interior side. EssentialBoard is made from 100% recycled beverage containers, for excellent carbon sequestration and non-toxicity. The 1/2-inch boards (which come in 4×8 and 4×9 foot sizes) and meet code requirements for structural sheathing.
    • This wall assembly is 17-inches thick and offer a total R-value of R-41.

The panels are currently under construction, and being stored until the whole building is ready for assembly. Stay tuned for more blog posts…

Zero House: Innovative Green Building

The Zero House innovative green building project is based on four simple concepts:

This joint project between The Endeavour Centre and Ryerson University’s Department of Architectural Science is being built for display at the EDITdx Expo for Design, Innovation and Technology in Toronto this fall, where show goers will be able to visit the home, meet the designers and builders and experience the Zero House innovative green building project for themselves.

This project is possible due to the support of a great many sponsors whose products and services make it possible to meet our high project goals.

Climate Champion Sponsors:

Climate Defender Sponsors:

Climate Friend Sponsors:

Each of the materials and products used in the Zero House have been carefully selected to meet our criteria for this project, and we’re appreciative of the manufacturers and distributors of innovative green building products for making a project like this possible.

Follow this blog as construction proceeds to find out more about these products and our use of them on this innovative project!

New Sustainable Renovations program

Endeavour Centre now offers full-time, certificate program in Sustainable Renovations! Program starts September, 2017…

Thousands of aging homes across Canada are confronting owners with expensive energy bills, uncomfortable indoor environment quality, a large carbon footprint and sometimes health concerns. Addressing these issues is no easy task, but the faculty at the Endeavour Centre is uniquely qualified to teach renovators and designers to vastly improve the quality of older homes affordably and responsibly.

The 4-month, full time Sustainable Renovations program employs a unique curriculum that mixes experiential education on a real renovation project with focused classroom curriculum to provide students with an immersive and in-depth education. In addition, LearnMate Tutoringl has been honed in the school’s Sustainable New Construction program, now entering its sixth year and responsible for training dozens of students on award-winning building projects.

Sustainable Renovations

Students will learn how to assess green building materials and strategies, source healthy materials, perform energy audits and design for energy efficiency, responsibly handle construction waste and be part of an integrated design and construction team, while participating hands-on start to finish of a project.

Lead instructor Shane MacInnes has spent years as a project coordinator for leading green renovations companies in Ontario and British Columbia. “There are so many opportunities for meaningful work in this field, and I’m excited to welcome students with and without construction experience into Sustainable Renovations.” MacInnes believes that “experiential education is the key to becoming a well-rounded renovator, one who understands the key principles and knows how put them into action.”

Endeavour director Chris Magwood is excited to be adding Sustainable Renovations to the school’s full-time, certificate program offerings. Having taught hundreds of students in sustainable new construction who have gone on to have careers in the field, he sees renovations as a key part of a cleaner, greener world. “Dealing responsibly with our existing housing stock is critical to our economic and ecological future, and we are excited to contribute meaningfully to this effort with this new course offering.”

Sustainable Renovations

The new full-time program begins on September 5 and runs until December 22, in Peterborough, Ontario. It is open to students with or without construction experience. More details are available on the program’s web page.

Zero House Sneak Peak

Zero House Project sets ambitious goals

Can we build homes with a zero carbon footprint, that use net zero energy and contain zero toxins?

The Sustainable New Construction class of 2017 is undertaking to answer that question with a resounding “Yes!” And they will be doing it in a completely modular, prefabricated form, at a realistic market cost.

Zero House is a demonstration project being undertaken by Endeavour Centre and Ryerson University’s Department of Architectural Science. The plan originated as SolarBLOCK by ECOstudio, a multi-unit design for urban infill sites. Zero House is a scaled version of a single module of the larger plan – one piece of a potentially larger development.

Zero House is designed to consume no more electricity than it produces in a year, and will use no fossil fuels. The building will sequester more carbon in its plant-based materials (which include wood, straw, mycelium, and recycled paper) than were emitted during material production, positioning it as an important solution to climate change. No materials inside Zero House will contain any questionable chemical content and the building will have an active ventilation system to provide the highest indoor air quality for occupants.

The project will be built in Peterborough in modular components, and then dismantled and rebuilt at the EDITdx Expo for Design, Innovation and Technology in Toronto this fall, where show goers will be able to visit the home, meet the designers and builders and experience Zero House for themselves.

Zero House

The class of 2017 gathers to start Zero House by making mycelium insulation samples.

The project is being sponsored by many progressive material and system manufacturers, and we will introduce them as their components are placed in the building.

We will keep an ongoing journal of the construction of this project, so keep watching here for updates and to follow our progress!

Thatch Roof Basics

Thatch roofs may seem like a romantic and foreign notion in North America, but they are entirely feasible in a wide range of North American climates. No other roofing is annually renewable, carbon-sequestering and non-toxic. A thatch roof may not be for everybody, but it’s worth considering…

This introduction to thatch roof basics is adapted from the book Making Better Buildings by Chris Magwood:

Thatch roof basics

Applications for system

– Roofing for roofs with a minimum pitch of 10:12

– Wall cladding

Basic materials

– Long-stemmed reeds or straw

– Strapping

– Twine or wire to fasten thatch to strapping


How the system works


While it may seem strange for modern builders to think that a bunch of dried grass stems can provide a thoroughly water-resistant and long-lasting roof, thatch roofs have a long and successful history across a wide range of climatic zones. Thatching techniques have been developed worldwide, adapting the basic principle to suit available materials and to work in specific climates. Modern thatched roofs are installed in almost every region of the world, though in relatively small numbers.

The system of thatching used in many wet and/or cold climates involves fastening bundles of long, thick reeds or straw to the roof strapping in successive courses, each overlapping the preceding course. The thatch is laid at a thickness (which can range from 8–20 cm / 3–8 inch) that prevents water from working its way through the layers. Thatched roofs have very steep pitches to aid in this drainage.

Traditional thatch was hand-tied to the roof strapping using twine or rope. Modern thatchers often use screws and wire to provide attachment. Regardless of regional variations in material and technique, the thatch is held in place by securing a horizontal member across the thatch and tying that member back to the strapping through the thatch. The next course of thatch then covers the tie point as the roof is built upward. At the edges of the roof, the thatch is laid at a slight angle to encourage runoff to leave the edge of the roof and to provide a consistent appearance.

Thatching on flat sections of roof is relatively straightforward, but the same cannot be said for ridge, hip and valley sections. These areas take considerable knowledge and experience to execute in a weather-tight and long-lasting manner.

Many modern installations use a fire-resistant (often fiberglass) membrane under the roof strapping to prevent the spread of a fire from inside the building to the roof. Eavestroughs are not typically installed with thatched roofs, making them incompatible with rainwater harvesting.


Tips for successful installation

  1. Thatching methods vary widely with the type of thatch material being used and the tradition of thatching used in the region. Ensure that the reed or straw being used is compatible with the climate and the installation technique.
  2. Be sure you are able to obtain the material and expertise required to create a thatched roof. It is a rare type of roofing in North America, and must be well researched before deciding to proceed.
  3. Plans for a thatched roof must be properly detailed before construction. The uncommon thickness of the roofing, the steep pitch required and the particular details at hips and valleys must be incorporated into the drawings to ensure the roof will work when built.
Thatch roof Canada

Dormers, hips and valleys require much more skill than simple gable roofs

Pros and cons of thatch roofs

Environmental impacts

Harvesting — Negligible to Low. Thatch that is harvested regionally will have the lowest environmental impact of any roofing material. The plants that produce useful thatch are annual grasses, making it the only annually renewable roofing. Some reeds that are suitable for thatching do not need to be manually seeded, but occur naturally on marginal lands that are otherwise not suitable for agriculture and aren’t sprayed or treated in any way. Most modern grain plants have been bred to have much shorter, narrower stalks than their genetic ancestors and are not suitable for thatch, but less common grains (spelt, rye, etc) still have stalk lengths and diameters that may work for thatch. Farmed grains may have environmental impacts associated with the use of herbicides and/or pesticides.

Manufacturing — Negligible to Low. Thatch requires little to no processing other than cutting, cleaning and bundling. These processes are done on a small scale and with minimal machinery and fossil fuel input. There are no toxic by-products created.

At the most intensive, a thatch roof will use a small amount of metal wire and screws and a layer of fiberglass matting that has high energy input and some toxic by-products. At the least intensive, round wood strapping and natural fiber twine is used.

Transportation — Negligible to High. Some thatch projects in North America are completed using thatch imported from Europe, because there are no commercial suppliers on this continent. This adds high transportation impacts to an otherwise low-impact roof. Many thatch roofs are made with locally, manually harvested material, keeping impacts very low.

Installation — Negligible. Thatch is largely installed without the use of power tools and does not create any problematic waste or by-products.

Embodied energy & carbon

Thatch roof Canada


Compostable — All reed or straw thatching, natural fiber twine.

Recyclable — Polypropylene twine, metal wire.

Landfill — Fiberglass matt offcuts, if used. Quantities can be negligible to low.


Energy efficiency

Historically, thatched buildings relied on the fairly significant amount of air trapped in the thatch to insulate the roof of the building. However, thatch allows for a lot of air infiltration and would not be considered adequate insulation or airtight enough to meet codes or modern comfort levels on its own. Modern buildings with thatched roofs rely on an insulation layer independent from the roof sheathing.

A thatch roof can have some beneficial effects by reducing summertime warming of the attic space quite significantly. Thatch roofs will also eliminate the issue of condensation on the back side of the roof sheathing as the material will not have the low surface temperatures of more dense sheathing and is able to adsorb and absorb moisture without condensation.


Labor input

Working at heights to install roofing has inherent dangers. Proper setup and safety precautions should always be taken when working on a roof.

Thatch roofing is unique in that, for most North American builders, harvesting the material is likely to be a necessary preliminary step. While suitable materials are widely available, harvesting and preparing them can be a very labor-intensive process, easily requiring more hours than the installation itself. In areas of the world where thatch material is harvested commercially and available for delivery to a job site, the labor input is obviously much lower.

Thatching is the most labor-intensive form of roofing. An experienced thatch crew can move at a speed that approaches that of an experienced cedar shingle crew. Beginners will move a great deal slower, as the process of laying thatch is very particular and must be done accurately and correctly.


Skill level required for the homeowner

Thatching requires a good deal of skill. In European countries, it takes many years of apprenticeship and experience to obtain the title of “Master Thatcher.” Beginners are advised to start with a very small roof, such as a small shed, and to keep roof shapes to simple gables or sheds. Hips and valleys add a lot of complexity to the thatching process, and should be left to those with plenty of experience.



Both the material and the expertise to build a thatch roof can be difficult to source in North America. A few master thatchers practice in the U.S. and they tend to import their thatch material from Europe.

A homeowner wishing to attempt a thatch roof will have to resort to harvesting thatch material locally and learn from books or by taking workshops with experienced thatchers and bringing the skill back home.



Thatch roofs are surprisingly durable. In northern European climates, they can last for forty to eighty years. Depending on the style of ridge cap used, the ridge may need repair or replacing every ten to twenty years. A thatched roof at the end of its lifespan is not typically replaced; rather new thatch is built over top of the existing thatch.


Code compliance

No building codes in North America address the use of thatch roofs. Proposing a thatch roof will likely require a fair bit of documentation and persuasion, as there are few examples of thatched roofs on which a code official can base an assessment. The historical and modern use of thatch in Europe means that a lot of code-related testing and documentation exists to support it. A building department may be willing to consider a thatch roof with the right amount of documentation and some assurance that the installation is being done properly. The few master thatchers working in North America have been able to have their work approved, as have a small number of owner-builders.


Future development

There is no reason for thatch to be disregarded in North America, as it is a viable, durable roofing option that is remarkably environmentally friendly. As the costs of conventional roofing materials rise with the price of fuel to make them, thatch will start to look better and better. The machinery required to mechanically harvest and bundle thatch is not complicated or expensive, and viable thatch material grows in many places on the continent. There will always be limitations to the use of thatch roofing in urban areas, as fire safety concerns would limit the density of thatched roofs. But there are many locations where thatched roofs are feasible, appropriate and the best possible environmental choice. It will take many dedicated homeowners willing to push the boundaries and create a market in which thatch may start to take the kind of foothold where it creates a viable niche market, similar to cedar shingles.


How does it rate?

Thatch roof Canada


Resources for further research

Billett, Michael. The Complete Guide to Living with Thatch. London: Robert Hale, 2003. Print.

Fearn, Jacqueline. Thatch and Thatching. Aylesbury, UK: Shire Publications, 1976. Print.

Sanders, Marjorie, and Roger Angold. Thatches and Thatching: A Handbook for Owners, Thatchers and Conservators. Ramsbury, UK: Crowood, 2012. Print.

Embodied carbon and carbon sequestration in buildings

Can buildings be an important part of the climate change solution?

The answer is Yes, and the key is using carbon sequestering materials instead of carbon-intensive materials.

Endeavour Centre director Chris Magwood is currently working on a Master’s thesis at Trent University’s Sustainability Studies program, examining the embodied carbon of building materials and the role of sequestration in drastically reducing the climate change impacts of our built environment.

On Tuesday, March 14th at 7pm, join Chris and hosts Fourth Pig Worker’s Coop, Eco-Building Resource and Green Community Hub at the Shacklands Brewing Company in Toronto to see the results of this research to date and learn more about turning our buildings into carbon sinks!

The event is free, and discussion time and beer will follow the presentation!

embodied carbon of building materials

Composting Toilet Basics

Composting toilets are the most misunderstood element of an ecologically friendly building. There’s no need to be scared!

This introduction to composting toilet basics is adapted from the book Making Better Buildings by Chris Magwood:


Composting Toilet Basics

Composting toilets collect urine and feces — referred to as humanure in the rest of this chapter — and treat it completely on-site, until it is transformed into useful compost or humus.

This category of treatment system does not include common pit outhouses, which do not provide ideal conditions for the conversion of humanure to compost, though given enough time the material in a pit toilet can undergo this transformation.

There are three common types of composting toilet:


Bucket toilet — This low-tech version of the composting toilet uses a bucket or similar portable receptacle placed under a seat/container to receive humanure deposits. Sawdust, wood shavings, chopped straw or another form of cellulose material is used to cover each deposit in the toilet, helping to reduce odor, absorb urine and provide aeration. Once full, the bucket is emptied into an outdoor compost heap. Here the material is layered and mixed and covered with more cellulose material, providing the right conditions for the natural conversion to compost/humus.

The indoor toilet construction is usually provided with passive or active ventilation, but no water connection or flushing action is used.

Self-contained toilet — These units provide a seat over an integral composting tray in a single, self-contained structure. Humanure deposits are received in the tray and provided with the appropriate conditions for composting action within the unit. These toilets all use some form of mechanical ventilation to reduce odor. Excess urine may require a separate handling system, or heat may be used to speed evaporation. Due to limited storage capacity, these toilets normally use some form of mechanical action and/or acceleration for the composting process and are only suitable for low numbers of users or for intermittent use.

The compost tray is removed from the unit when processing is complete or when the tray is full. It is often necessary to have an outdoor compost heap to receive material from these units, as it can prove difficult to complete the composting process within the unit.

Some models of self-contained toilet use chemicals or high heat to “cook” the humanure into a benign state. The material from these toilets is not useful compost, as the biological activity that creates rich, useful soil has been killed off.

Remote chamber toilet — A toilet (dry chute or low-water flush) sits above a large, enclosed chamber that receives humanure. The chamber is of sufficient capacity and design to contain and process a high volume of completed compost.

Units handle humanure in various ways. Some use heat and/or evaporation to rid the chamber of excess urine and water and speed the composting process, while others retain and process all material. Mixing or stirring capabilities, misting sprayers and rotating trays are options offered by certain manufacturers. Vacuum flush, allowing the toilet to be level with or below the height of the chamber, is also available. With this type of toilet you will definitely need a plumber at some point to do pipe rehabilitation

Some units gather excess urine after it has passed through the bulk material in the chamber and retain this liquid as a high-quality fertilizer. This makes best use of the potential value of all material entering the toilet, as up to 80 percent of the nutrient value in toilet waste is in the urine. Once transformed into nitrites and nitrates after passing through the biologically active compost solids, the liquid can be a safe and low-odor fertilizer.

All chamber-style toilets provide humanure with enough time and adequate conditions to fully convert to compost before being removed from the unit. These are the only units that do not require additional outdoor composting capacity.


Types of waste handled

– Black water (though most systems are waterless)


Tips for successful installation

  1. Understand the maintenance requirements of any type of composting toilet before committing to installation. All require some maintenance, and dealing with humanure is not for everybody. Some units require infrequent maintenance, others daily.
  2. Check local codes before planning for a composting toilet. They are an accepted solution in some codes but not in others.
  3. Check local codes for the legal status of composted humanure. Though a good deal of documentation exists to show the material is biologically benign, some jurisdictions require compost to be treated as hazardous waste.
  4. Some types of composting toilets require specific layout arrangements that must become part of the home design.
  5. Mechanical ventilation is part of most composting toilets, requiring an exit tube that passes through the roof of the building with as straight a run as possible.
  6. Plan for an easily accessible route from the point of removal to the outdoors, to facilitate emptying of the toilet or chamber.
  7. Be sure there is sufficient provision on the property for units requiring outdoor composting facilities, and that the process of finishing humanure compost outdoors is well understood.
  8. When using commercially produced units, follow the manufacturer’s instructions for successful installation.


Pros and cons

Environmental impacts

Composting toilets are the only form of toilet that does not treat human excrement as waste, and rather as a potentially regenerative material for amending soils and fertilizing plants. A large environmental problem is thereby transformed into a solution to soil depletion, creating more robust growing environments.

The composting of humanure is not without issues, and untreated or partially treated material can be contaminated with pathogens that are potentially dangerous to humans and animals and can contaminate soil and ground water. There is a growing body of evidence that complete composting of humanure is relatively easy to accomplish reliably, but the correct conditions must be understood and created.


Material costs

Simple bucket toilets and appropriate outdoor composters can be built for as little as a hundred dollars. Complete remote chamber toilet systems can cost between four and eight thousand dollars.


Labor input

Depending on the type of composting toilet, labor input can vary greatly. Other toilets do not require direct ventilation, and even the simplest composting toilet has more components and longer installation times than a conventional flush toilet.


Skill level required for the homeowner

Installation — Moderate to Difficult. Multiple components and connections can complicate installation.

Use — Easy.

Maintenance — Moderate to Difficult. Some form of regular maintenance is inevitable with composting toilets. Bucket toilets can require daily maintenance to transfer full buckets to the compost pile. Chamber units may only need monthly inspections and annual emptying.



There are many commercially available self-contained and remote chamber toilets. These are typically sold directly from the manufacturer or in specialty shops. Bucket toilets are homemade, with plans readily available online or in books.

Plumbing for any composting toilet system are standard components available through any plumbing supply outlet.



The simpler the toilet system, the greater the durability. Units with heaters and moving parts are more prone to durability issues. Consider the accessibility of parts that may need repair or replacement; if they are in difficult locations (especially if they require emptying of the toilet’s contents) they will be unpleasant to service.


Future development

Interest in composting toilets is just beginning to grow, and the technology is likely to develop rapidly in coming decades. There has been a significant shift in understanding about humanure, from a sense of revulsion and the certainty of contamination and illness to an appreciation of the simplicity and value of composting. It will be some time before this shift affects a broad constituency of builders and homeowners, but the research and experience currently being gained in this field by early adopters will be valuable contributions to a technology that is potentially transformative. There is little else in home-building practice that could so radically improve the environmental impacts of our homes.



Build and operating a composting toilet system in a low- or no-energy scenario is straightforward. The bucket toilet is an excellent example of resilient technology, as it not only replaces an energy- and resource-intensive practice, but does so in a way that gives back valuable nutrients to the ecosystem.


Resources for further research

Jenkins, Joseph C. The Humanure Handbook: A Guide to Composting Human Manure. Grove City, PA: Joseph Jenkins, 2005. Print.

Del Porto, David, and Carol Steinfeld. The Composting Toilet System Book: A Practical Guide to Choosing, Planning and Maintaining Composting Toilet Systems, an Alternative to Septic Systems and Sewers. Concord, MA: Center for Ecological Pollution Prevention, 2007. Print.

Darby, Dave. Compost Toilets: A Practical DIY Guide. Winslow, UK: Low-Impact Living Initiative, 2012. Print.

Envirolet vacuum flush toilets

Phoenix composting toilets