Working on a detail with a builder to add 1" of polyiso to the exterior of an existing 2x4 wall in Zone 5.
Planning to install cedar singles as the sidewall material. Most often, it seems the drainage layer (water control layer) is behind the foam (b/w foam and sheathing). However, we would like to use a drain wrap as the air control layer with the added benefit of providing a small (very small) level of drain space behind the shingles.
Any issues with placing the drain wrap b/w the shingles and foam as opposed to installing the housewrap between foam and sheathing?
Happy New Years!
Posted Wed, 01/01/2014 - 12:48
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