The Endeavour Centre in Peterborough, Ontario has consistently developed excellent, hands-on courses for students of all ages to learn the craft of building low-impact, sustainable homes. The “low-impact” aspect is important because there are lots of “green buildings” out there that use materials with toxic chemicals and have a high carbon footprint. Our version of “traditional building” is so far removed from the traditional building before the 20th century, it is almost unrecognizable. The Endeavour Centre’s sustainable building programs highlight the use of natural materials, many of which are renewable (ie., wood, straw, cork, flax, wool), or are made from recycled materials (insulation, roofing).
If you’ve ever had a dream of learning how to build sustainable homes, there are two great courses coming up in 2018.
From the Endeavour Website:
Natural Building Intensive – Though we do lots of work with natural materials, this is the first time we’re offering a natural building intensive. This one-month course will give participants a chance to construct two small buildings from foundation to finish, and gain experience with just about every natural material/strategy available in this part of the world.
Sustainable Renovations – We’re expanding the successful model of our five-month, full-time Sustainable New Construction program, but giving participants the chance to focus on making a net zero energy, net zero carbon, zero toxin and zero waste renovation to an urban lane way garage to turn it into healthy and efficient living space.
The Mosaic Centre, Edmonton, Alberta, Net Zero building , (via Flickr https://www.flickr.com/photos/130826943@N07/with/25286762851/)
At the Green Building Festival, Jen Hancock gave a presentation on how her company, Chandos, delivered a net zero building commercial project to the client, four months early, under budget. To deliver a building under budget is rarely heard of, but throw in net zero while delivering a completed project four months early, and now you’re into territory that is pretty much uncharted in the construction industry. I contacted Jen after the presentation because I wanted to find out more about how they accomplished this feat. Chandos isn’t like other construction companies and this is immediately evident when you see that Jen’s title is the Director of Innovative Construction. How many firms have that title on their roster?
I asked her if she’d been busy presenting this project to other conferences and she said, “I’ve been really busy presenting this concept — the way we built the Mosaic Centre has overshadowed, to some degree, the fact that it’s a net-zero building.” It should be noted that Chandos and The Mosaic Centre are located in Edmonton, AB, where temperatures can dip into the -30Cs in the winter months, so building a net-zero building is a huge accomplishment. In fact, it is the most northern commercial net-zero building in North America. » Read more: How Integrated Project Delivery reduces costs, waste and time for construction jobs
In the wake of record-breaking warming temperatures, you might be wondering what you can do to lighten your carbon footprint. Besides curbing your air travel and becoming a vegetarian, you can looking at tightening your residence’s building envelope, or renovating using more benign materials. The Endeavour Centre in Peterborough, ON, hosts a bunch of different kinds of green building workshops, and the first one on designing your sustainable home will be held in Toronto on February 6-7th. The schedule for all of their courses is below, but visit the Endeavour Centre’s website for more information.
I haven’t spent any time writing about rain screens — a building technique that has tended to be associated with wetter climates. The point of rain screens is to let the water that gets behind the facade drain out so that the building stays dry. As our buildings are designed to be tighter and tighter, any penetration can lead to water getting into a wall assembly but having nowhere to get out causing all kinds of havoc from wood rot to mould build-up. Eventually, these two things can lead to structural failure and health issues for building occupants.
I contacted Dave Petersen from Outside In Design Build to discuss rain screens, a technique for constructing a wall assembly that has gained traction over the years due to its ability to keep water away from infiltrating walls. According to Dave, it is a requirement of most local building codes. While it is used on the (usually) rainy West Coast (note they’ve instituted drought restrictions in Vancouver), it is also a good method for building here in the east, even in colder climates, and, in fact, many cladding materials require its use with their products.
How it works (from correspondence with Dave Petersen):
The rain screen assembly allows for water getting past the outer (face) barrier to weep down and outward (gravity assisted and pressure equalized) once the wind abates through a series of engineered flashings and weep-assemblies. These often include bug screens, through wall flashings in metal and ice and water shield materials. The key with this system is to allow for pressure equalization behind the face materials which will allow the water to drain away instead of continuing its way through the wall assembly. Most wall systems (brick and stone veneer, siding, EIFS*, cement board, etc.) are designed to work as part of a rain screen wall system – there are few barrier walls left, other than precast concrete panels, which have a rain screen caulking system that helps drain these assemblies. Hot/dry climates can even benefit from a rain screen cladding as it may act as a radiant barrier and slows heat transfer through the façade into the building.
Traditional Face-sealed facades (Diagram from: http://www.buildingscience.com/documents/digests/bsd-013-rain-control-in-buildings)
The pros and cons of rain screens are listed below (again, thanks to Dave Petersen).
Enhanced water management in all climate zones (USA and Canada)
Improved material durability
Effective at blocking radiant heat gains
Possibly higher costs
More detailing at the site level
May be prone to detailing errors that limit its effectiveness (mortar dams, etc)
The cons can be minimized by using an integrated system approach and most cladding products are readily detailed for these types of walls. Education of trades and proper site management will minimize most of the other issues.
(*EIFS – “Exterior Insulation and Finish Systems”).
By daveynin from United States (Largest Vertical Garden in North America) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
As a precious architectural approach that supports sustainable design, living walls and rooftop gardens are not just excellent choice for green house arrangement, but a great ecological contribution and energy efficient venture. Consisted of lush vegetation layer grown on the top of the building, green roofs are perfect natural insulator. Their depth, dimensions and type can vary from subtle green surfaces to impressive roof garden spaces. Vertically planted greenery on inside or outside walls is another popular green architectural solution, equally used on public buildings, huge constructions and private homes. Installation of living walls and green roofs in houses abound with benefits for house owners and entire surrounding:
Environmental impact of green walls and roof gardens
While installing outside green facade brings improved house aesthetics and pleasant wall landscaping, its affection on wider environment is not just positive, but extremely valuable. Apart from creating precious onsite cooling, vegetative wall and roof, the green designs contribute to the production and spreading of cool air throughout entire urban area, preventing extreme heat waves. Thick exterior wall greenery and roof gardens, thanks to the photosynthesis process, release tremendous amounts of oxygen while at the same time absorb harmful air components, enriching the environment with continuous sources of fresh air. Living walls as well as green roofs stand out as extraordinary heat insulation, meaning that its implementation reduces energy utilization and polluting outlets. Green roofs are particularly beneficial for the minimization of stormwater runoff, rainwater purification and lowering the pressure on drainage systems. In addition, these benefits help save the environment from water waste and improves overall water quality. Lush roof vegetation is secure shelter for dozens of insects and birds, whose existence is particularly jeopardized in urban parts, so there is a huge positive influence on biodiversity preservation.
By 20080708_Chicago_City_Hall_Green_Roof.JPG: TonyTheTiger derivative work: — raeky (talk | edits) (20080708_Chicago_City_Hall_Green_Roof.JPG) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons
Houses covered with living walls and green roofs stand out for its distinguished attractiveness which refreshes not only backyard area, but the appearance of entire neighbourhood and community. Apart from impressive outside scenery, both green walls and massive rooftop gardens are excellent noise neutralisers, what contributes to common public comfort and serenity. Walls carrying the most stable green wall system can serve as powerful stopper of squall and rain drifts, diminishing an opportunity of great blizzard hits. Outside house vegetation empowers local fauna and creates natural balance within urban regions, saves local natural sources, but also protects community from floods and downsizes the quantity of sewage water. In the end, green walls and roofs improve local air quality and better the public health.
The advantages for home owners
By Downtowngal (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons
Private houses covered with vegetative walls and roofs are provided with excellent thermo and cooling insulation what results in less energy spent for heating and air-conditioning, so home-owners are achieving minimization of their household expenses. While outside green walls offer perfect backyard cooling and oxygen supply, house owners also decide for improving indoor air with wall greenery. Both green walls and rooftop gardens provide households with noise and construction protection, but also with possibility of creating stormwater based irrigation systems. That reduces overall water consumption, saves resources and minimizes the amount of utility costs. Although green roofs are pretty simple to install, it’s recommendable to always work with a licensed roofing contractor to make sure your roof can withstand the added weight of a green roof since they are much heavier when wet than asphalt shingles. Above all mentioned benefits, vegetative walls and roofs improve overall life quality and provide incomparably healthier living environment.
For the most part we rely on third party organizations to determine what is and isn't a "green building material." The only time we might not is when products are locally produced or no third party green designation is available for the product.