This is what I am doing to go through the wall with my flue. I will probably use black single wall inside and insulated pipe outside. This setup will be for a wood stove temporarily to heat a large sun room until I can build an aircrete sub-floor with a hard finish on top. Then I can build a rocket mass heater. I will run the wood stove full throttle and stack concrete blocks and sand to hold heat to help prevent creosote.
Any ideas or comments are welcome.
I've a couple of questions for you:
-what is the weight of your aircrete thru the wall?
-do you know the R value of aircrete?
....I know we all do what we can instead of what we will sometimes but I still wonder if there is a natural mix other than concrete (which Mr. Wheaton points out has a huge carbon foot print), which would foam up so nicely and have similar compression strenghts to concrete.
You can use cob, but it is a little harder to get right and needs to be protected from rain. Add perlite for insulation.
"You must be the change you want to see in the world." "First they ignore you, then they laugh at you, then they fight you, then you win." --Mahatma Gandhi
"Preach the Gospel always, and if necessary, use words." --Francis of Assisi.
"Family farms work when the whole family works the farm." -- Adam Klaus
posted 2 weeks ago
Orin Raichart I'm not sure of the weight or the R value but I do know the R value is fairly significant. I have seen guys put a propane torch to it for several minutes, like 10 to 15 minutes on 2 or 3 in. peace and still not feel the heat. I do not have an accurate way to measure other than bathroom scales and measuring cup an I like to keep things quick and simple. The main thing I'm concerned with when I make my sub floor with aircrete, other than being structural enough to hold the weight of a 1 or 2 inch hard concrete floor is to have enough insulation to give a good thermal break from the earth below. It would also use a little less Portland than a solid concrete floor and then with solid concrete you would have to put insulation under for a thermal break. How toxic is it to make that blue foam, plus I figure it is at least half the cost of The blue foam.I may even consider trying a cob floor on top of the aircrete subfloor.
R Scott, interesting concept, cob-foam or aircob. I may try some experiments with that. maybe even add a small amount of cement to help stabilize it, or plaster of paris or hydrocal. Crap here I go spending more money on experimentation.