Spray foam on 2×4″ roof trusses?
I am going to have spray foam sprayed on the bottom side of the roof decking on my shop in southern Colorado zone 6b.. The trusses are 2×4″ and 16″ OC. My thought was 4-5″ of closed cell. Should I have enough foam applied to completely cover the 2×4? To eliminate thermal bridging and condensation? If so, should I put 6″ in each 16″ bay and have two inches cover the 2×4? In other words all you would see is continous foam, the 2×4 would be completely enclosed in foam
At this time there will not be a ceiling in the shop. Later I will install sheetrock or sheet metal
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