Design Advisory: Re-roofing Over Structural Concrete Decks

One of the challenges when tearing off over structural concrete decks is addressing residual moisture from leaks, inadequate initial drying, or condensation. When the existing roofing materials are removed and the surface is dried, it can take a long time for invisible moisture absorbed within the slab to dissipate and for the concrete to reach an acceptable relative humidity level. Improper drying causes moisture to stay trapped in the new roofing system, adversely impacting the performance of certain components.