Strategic powerhouse – GreenBuildingAdvisor

Wall Assembly Advice for Off-Grid Mountain Cabin

Hi everyone! I’m looking for some input on a wall assembly I’m planning for my off-grid mountain cabin. The cabin was built in 1986, but harsh weather and a lack of maintenance from the previous owner have left us with quite a few projects to tackle…

We’re currently overhauling our solar system, so I plan to test out this wall assembly on our powerhouse shed before applying it to the main cabin.

Here’s the assembly I’m considering:

1. Interior insulation – The existing fiberglass will remain in some areas. I plan to add closed-cell spray foam in others for increased air sealing and R-value.

2. 1/2″ CDX plywood sheathing

3. Delta-Vent SA weather-resistant barrier (WRB)

4. 1 layer of Roxul Comfortboard 80 exterior mineral wool insulation

5. 1×4″ furring strips for a rainscreen gap

6. Hardie siding with a metal skirt at the bottom for snow protection (alternatively, I may keep the existing oak board-and-batten siding if it’s still in good shape)

Any thoughts or suggestions based on experience with similar builds or climate conditions? Thanks in advance!