In a short post the following could be considered:
This is not a "permie build" system...with way too many "buzzwords" trying to attract folks wanting a "green build."
EPS foams (whether recycled or not) are not the "best" foams available today.
There are (from a quick review of the web page) superior framing systems to the one demonstrated to mitigate "thermal bridging." A "wall truss" or "staggered stud" method is more efficient than what the web page suggested.
Take there projected cost per square foot for a "turnkey project" and compare that with other systems. Also, question the "age of the system" and the company...Few of these have been around for more than 40 years...while the "natural build" systems profiled here have often been in use for well over 100 years...with good effect.
I agree with Jay in that its tough to compare the entire system to other approaches but I like many aspects of the system too. My quick concerns are the apparent thermal bridging, lack of shear strength, the accuracy and difficulty site modifications to the panels and that they offer double hung windows as part of the package??
As for the appropriateness of the foam in permaculture, I think reducing the ongoing, monthly un-renewable energy costs is among the most important goals for a permies or green build. The advertised R values seem to address this concern.
"If you want to save the environment, build a city worth living in." - Wendell Berry
posted 5 years ago
Thanks for both of your input. I would prefer to do something like straw bale or an earthship, but I have spoken with the building department and I really don't think that I will be able to pass their codes. I am looking at more main stream, greenish options that are in my price range to be more energy efficient.
Jay C. White Cloud
posted 5 years ago
When you get closer to a coalesced plan...please place a "project post" here at Permies in the appropriate section like SB, timber frames, earthship, etc. In the interim...to give hope...many code department can have their "understanding" challenged if the presented design is offered in the correct format with often necessary credentialing to go with it. Many of the presented designs must have "language" and "simatics" that adhere with the code departments understanding. Very often it comes down to better communication...especially when the build is preserved as "atypical," even though it is not.
As always the debate about how Permi foams are rages on. The only thing I would add for the lay person is that yes EPS foam is not "the best" foam product on the market, however it is depending on your perspective and use probably your best bang for the buck product on the market.
Looking at their construction video, the major thing I would do differently is I would probably spray foam the foam joints at the inside to ensure that there is a consistent vapor barrier on the inside of the envelop that will allow the wood studs to still somewhat dry to the outside of the wall if necessary.
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