Glenn Herbert wrote:Adobe walls? Are you planning this all around the exterior? How thick will they be? If any real thickness, this will be a dead load that requires serious support, and you will definitely need piers at least as much as you show all around. For that matter, piers under an adobe wall just don't make sense to me. I would want at least mostly continuous support, so piers that settle don't cause big cracks.
Or is this an isolated feature inside the house? In that case, nevermind
Peter VanDerWal wrote:
Jim Grieco wrote:Thanks for the suggestions. We are off grid and not involving the county so no code/permits but I still want to build correctly.
Off-grid or not, I don't think you can legally avoid the county, at least not completely.
I don't know what the rules are where you live. I live south of you in Cochise County. Here, if you have at least 4 acres, you can file for an exemption to county inspections, but you are still required to get a building permit and submit your design for review, and of course you have to follow the relevant building codes (electrical, plumbing, structure, etc.) You just don't have to have the inspectors come out and check your work at every stage.
I'd seriously recommend checking with your county's zoning and planning to find out what the requirements are. If you're required to have a permit and build without one, you can end up in a legal battle with the county and possibly have to tear down the structure. It's really not worth it to try going guerrilla.
Besides, when they review your plans they will tell you whether or not your posts need concrete, how deep they need to be, etc. I don't know what it costs where you are, but here a permit is only around $100, well worth the money for the professional building advice if nothing else.
Glenn Herbert wrote:You can trade off pier spacing against rim joist strength; I can't give you figures for what will work without knowing complete information on the bending, shear, and deflection capacities of your joists, and the actual dead and live load per square foot of floor and roof plus any extra concentrated loads. 16' (which is what most of your common joists will span) is quite a bit, and I would anticipate a possibility of bouncy floors even if they bear the weight fine.