[WA] Prescriptive single-wall construction?

[SDS]

Are there any provisions within prescriptive code for bracing with single wall construction in SDC D (other than let-in which is not allowed)?

 

[classicT]

Single-wall construction, also called box house or plank wall construction, is a non-prescriptive technique. And for good reason - most of the buildings built in this fashion have relatively short lifespans due to a lack of a continuous foundation, water damage, insect/pest damage, and structural failure. Structural failure is a primary issue and relates to the general lack of vertical structural members (as compared to traditional framing) and the general lack of any seismic/wind bracing.

As a fellow Washingtonian, I am not sure how you would be able to meet the energy code provisions either. Single-wall construction is more predominant in temperate climates where insulation was not required (early 20th century). Single-wall construction lacks any cavity space within the wall assembly.

Example of one style of Hawaii single-wall construction on post and pier (there are several variations from this style). [From - researchgate.net]​

“Single-wall” construction typically utilizes ¾-inch to 1-inch thick tongue and groove cedar or redwood boards placed vertically to form a load-bearing exterior wall without studs. A flat, wood top plate is attached against the vertical siding board to serve as a ledger for attachment of the ceiling and nailing of the roof truss rafter. Roof construction in single-wall residences is typically light non-engineered framing with composition shingles on tongue and groove (T & G) wood decking, or corrugated metal deck roofng directly attached to shallow wood rafters. Full plywood sheathing of the roof is not provided, and rafters are sometimes spaced up to four feet apart in the T&G roofed systems.