There are three illustrations of that on page 76 of the book, Figures 3-10a, 10b., and 10c. per linear foot.īut if you're using the 8" CMUs for a basement wall, just place your bales on the floor above that, with the inside edge supported by floor joists. For wall weight comparison, a 6" stud wall filled with fiberglass insulation and clad with cement board siding on the exterior and drywall on the interior is around 12 lbs. The weight of the inside wall surface-just the plaster-is close to 15 lbs. If you multiply that times your wall height, you'll have some idea of what the linear foot weight is it's usually over 300 lbs.
#Cmu stem wall full
On pages 69 - 73 we detail what's involved in calculating the weight of the full wall assembly, which can range from 45 lbs. Straw bale wall assembles are actually quite heavy-we summarize this in the Structural Design Chapter of the California Straw Building Association's book S traw Bale Building Details: An Illustrated Guide for Design and Construction. Better to support both edges of the bales (outside and inside) than attempt to cantilever that amount of weight. The bigger weight seems like it will be from the rest of the structure (the post and beam and roof and 2nd floor). It just seems like such a minor weight on the CMU blocks. Were you having some fail with overhangs?įrom what I understand CMU blocks on paper seem like they should be fine.ĬMU blocks are rated at 1700 pounds per square inch compression strength at minimum (and I'm reading that they go up more towards 2500 - 3000 psi).įor a wall of 7 bales high, at 60 pounds per bale (420 pounds) across 2 bricks (since bales are double the length), that's only 1.65 pounds per square inch (without the clay render or considering the roof and posts and all that).Įven if the weight of the coating and internal support was another 3000 pounds, that is still only adding another 12 pounds per square inch. I'm curious what your experience has been with them. The straw bales will have a lot of weight added with the clay coating. John C Daley wrote:I believe from experience that amount of overhang, even with timber would be bad news.
0 kommentar(er)
