In our office, we just finished a project with steel studs and gypsum sheathing. We normally like concrete masonry unit wall back-up with hydrocide coating behind brick veneer, but economics has caused this old construction method to only be used on higher end jobs. On my drawings, I put 15# (fifteen pound) felt over the gypsum sheathing. When the contractor started placing the felt on the building, we noticed it was No. 15 felt. not 15 pound felt. After some research, it seems the roofing industry is trying to pull a fast one here. No. 15 felt is about 8 pounds a square yard, where 15 pound felt is about 12-14 pounds a square yard. I find it amazing that 15 pound felt is almost impossible to find in building supply houses, and is actually is a special order item. So we told the contractor that he had to use No. 30 felt which is about 11 pounds a square yard. After much arguement, he did. I find it funny that the roofing industry has done some pretty tricky marketing when it comes to felt. So from here on out, I note felt as #30 on my drawings.
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