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Originally Posted by cmac2012
It may not be cheaper but it is much easier on the resource base. Straw is a virtual throwaway item in many places, though I read that rice farmers in N. Cal are making ethanol out of it. And the R-factor is awesome. Some framing required, modified timber framing maybe, and steel could be used to good advantage.
T, you surely know the answer to my question (I should know it): how thick would a framed wall with fiberglass insulation need to be to have R-factor of R-28?
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the way i usually build, a 2x6 wall with fiberglass and plywood or osb sheathing you have about r 22. to get r 28 you could add 3/4" styrofoam on the outside or go to a 2x8 wall with r30 insulation for a total r of about 33. i have built up to 12" thick frame walls with fiberglass insulation.
the hay bale thing sounds appealing, but you have to have a separate structural frame, and give up a lot of floor space to the thick walls. framing and sealing around windows would be an area of concern too. i hope it works out for you, r leo.
for me, i have to be able to get normal contractor types to build things so that my clients can have a predictable price and outcome. experimenting with new methods of construction would be a good way for me to get my a$$ sued out of business if there were problems.
so non professionals have to be the vangard of experimentation. like in many fields.
tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.
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..I also have a 427 Cobra replica with an aluminum chassis.