I'm sorry I haven't gotten back to this thread yet; it wasn't giving me notifications like I asked it to.
I'm comparing the cost for a 16' x 10' stud walls (framing only) to a wall the same size made of hyperadobe.
The wooden framing is being figured as a 16' x 10' based on 2"x4"x16' treated boards for the top and bottom, and 2"x4"x10' studs on 16" centers.
The hyperadobe numbers are based on these calculations:
- On another site, I saw that a typical 18" x 30" individual earthbag winds up about 24" long after it's filled.
- The same site said an individual bag holds a out 100 lbs
- I've also been told the average course height is 4".
- I've been told that a good mixture is 64% sand, 30% clay, 6% cement. I'm figuring on that, even though the final mix just have different proportions.
- The clay is $30/ton and the sand is around $10-20/ton. The cement is about $5.50/80 lbs.
- The tubing I'm looking at is roughly 30¢/foot.
Given all that, a traditional 24" bag that holds 100 lbs in those proportions would be 30 lbs of clay, 64 lbs of sand, and 6 lbs of concrete. I figured the price/lb from the prices of the tons, worked up the cost for 24", then divided it half to get the price per linear foot for a single course. That came out to about 88¢ per foot.
Given a 4" course over a 10' tall wall, I'd need 3 courses/ft of height, meaning 30 courses. So I figured a section 1' long and 10' high would be around $26.37. Multiplying that by 16 (to compare the length of the stud wall), I came out with $421.92 per 16'x10' section.
Hope that helps. Seems clear as mud when I try to explain it.
Edit - I'm going to have to do a stud wall inside eventually anyhow, because the wife refuses to live in a place where she can't use a normal drill bit to hang pictures, and she hates the look of the interiors of earthbags building. Happy wife, happy life, and all that.