[GSBN] Load-bearing straw bale idea

Derek Stearns Roff derek at unm.edu
Sat Jun 24 10:00:57 CDT 2017


If we are going to replace the architect’s plan with a post, as Bruce, Lance, and David suggest, then the “appropriate post” needs to run to the foundation, in my opinion.  Like David, I doubt that a simple post running only from the ridge beam to the roof bearing assembly would be sufficient to distribute the loads.  Running the post all the way down to the ground/foundation is the simple and secure solution.  I’m thinking that this is what Lance and Bruce probably had in mind.  Of course, a full-length post must either go through the roof bearing assembly, or be completely outside or inside the plane of the wall.  The latter two choices can be an attractive design element, in addition to the structural role.

Derek

Derek Roff
derek at unm.edu<mailto:derek at unm.edu>




On Jun 23, 2017, at 10:55 PM, David Eisenberg <strawnet at gmail.com<mailto:strawnet at gmail.com>> wrote:

I concur with what has been suggested by others, but would add that switching to an appropriate post instead of the bales assumes that the roof bearing assembly is stiff and strong enough to bear that concentrated load. If the roof bearing assembly (box beam or whatever the structural element is on top of the bale walls) is not adequate for that concentrated load, a truss could be designed to distribute the load along the length of the assembly (whether the full length would be necessary or not).

David Eisenberg

On Fri, Jun 23, 2017 at 8:06 AM, Rikki Nitzkin <rikkinitzkin at gmail.com<mailto:rikkinitzkin at gmail.com>> wrote:
Hi all,

I forward a petition from a Spanish architect who wants to know if his idea has been tried, and if it worked.

He is planning to build a Load-bearing SB home. The roof will have two “waters” (what is that called in english?)- creating a triangular gap on both sides of the roof.

He wants to try to put the main beam (Spanish architecture doesn’t use triangular rafters, but a main roof beam, with the other beams resting on it) directly on the bales. His idea is to put a wooden panel on top of each row that is above the roof-plate, until reaching the main beam- using very well compressed bales.

Has anyone tried this?

Here is a drawing of the idea:

<hastial Alejandro.jpeg>

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