Risk of Rot in Warm Roof Outlooks
We’re building a hybrid warm shed roof (2:12) following to Rockwool’s specifications (attached). 8″ exterior comfortboard, 6″ interior comfortbatt. The engineer revised our original plan to what is currently attached because he was worried the roof wasn’t strong enough. He has embedded 2×4 outlooks inside the vapour permeable Rockwool. When I asked if they would rot he said he didn’t know, that he wasn’t “that type of engineer.”
We live in the PNW temperate rainforest (climate zone 4C, dry summer-wet winter). There is a large 3″ venting gap above the Rockwool and the metal roof, but our winters hover around 80% humidity and we receive 13″ of rain per month Nov-Feb.
1) Do you think those outlooks will rot?
2) If we have stick with this design, what precautionary measure can we take?
Thank you all so much for your thoughts and help!
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