How many plies of fiberglass felts are typically needed for a concrete deck?

Typically, two plies of fiberglass felts are needed for a concrete deck in roofing applications. Using two plies provides increased durability and enhances the waterproofing capabilities of the roofing system. The first layer serves as a base that is securely adhered to the concrete deck, while the second layer adds an additional barrier against water infiltration, reinforcing the overall integrity of the roof.

Concrete decks, being rigid and potentially subject to thermal expansion and contraction, benefit from this multilayer approach as it helps to accommodate slight movements and reduces the risk of cracking or separation. Additionally, the use of fiberglass felts is advantageous because they offer moisture resistance, which is crucial for the longevity and performance of the roofing system.

By implementing two plies, roofing contractors ensure that the roof can withstand the various environmental factors and stresses it will face over time, ultimately leading to a more reliable and longer-lasting roofing solution.