14 Aug '17, 1am

GBA: There�s Rot in the Roof https://t.co/m33U2ZzD7C

GBA: There�s Rot in the Roof https://t.co/m33U2ZzD7C

"The moisture was piggybacking on the exfiltrating interior air that was escaping through cracks in the cut-and-cobble foam, and that moisture condensed on the underside of the roofing felt Originally made with cotton rag content, this asphalt saturated product is now made of paper. At times confused with building paper, roofing felts and building paper differ in two ways: felts are made of recycled-content paper, building papers of virgin paper; felts are made of a heavier stock paper; building papers a lighter stock. ASTM qualifies roofing felts with the following ratings: ASTM D4869 (Type 1 with a minimum weight of 8 pounds per 100 square feet) and ASTM D226 (Type 2 with a minimum weight of 11.5 pounds per 100 square feet). “#15” felt used to weigh 15 pounds per 100 square feet, but not anymore; non-ASTM felts can weigh as little as 7 pounds per 100 square feet. Althoug...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/qa-spotlig...

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