Depending on where you build, these types of construction methodologies may not be code compliant. In both cases, it’s often just that structural properties of these alternative methods aren’t commonly known (especially when compared to the ol’ standby of stick building).
Like the newly adopted Tiny House codes, Straw Bale was accepted into IRC as an Appendix, meaning it has to be accepted independently from the IRC. That acceptance gives some teeth to an argument for the use of alternate methods and codes for their compliance.
In some cases, the structural properties of the wall systems simply aren’t trusted without a more common framework, especially for roof support. Code officials often accept that Timber Frame and/or Post and Beam can be used for the main structure (e.g. corner posts, wind bracing, and roof trusses) with alternative systems used for insulation (SIPs are most common, straw bale an option, cob and cord wood may be used for infill… maybe, a living roof… maybe).
If code compliance isn’t an issue (e.g. your building a garden shed, not a dwelling, that is less than minimal square footage, which is often 200 sqft), you could dabble with any method you like. That said be sure to check with local ordinances lest your accessory structure be deemed “unapproved” construction, an excess of total structures, or breaking of any covenants and restrictions in your neighborhood. Big show stoppers are siting within easements and setbacks.
I’d love to discuss your interests, and am glad to brainstorm options for your alternative construction.
Live Large — Go Tiny!
Thom Stanton
