Has anybody out there used fanfold insulation as a rain screen gap material?
I’m wondering if anyone has used 1/4″ XPS fanfold insulation for a rain screen gap and if there are any downsides I should be aware of. This was one of several materials to use in this application suggested in Martin Holladay’s 2013 “All About Rainscreens” article.
<<– rain screen gap material–>> (wrapped with insect screen)
Fiber Cement Siding
Climate zone 5
I’m leaning towards using fanfold here instead of 1/4″ wood lath for the following reasons:
1. High levels of termite activity in the area (less likely to chew through XPS than wood)
2. Brittleness of fiber cement siding. (The thinner more flexible fanfold material should help prevent breakage if the event of any impact to the siding, such as children running into it.)
3. Price. (corrugated plastic products like Cor-a-vent are much more expensive). I’ve already purchased the Tyvek house wrap so using a different dimpled drainage/housewrap is not an option.
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