Moisture is not limited to reflective roof systems
I am writing in response to NRCA's Associate Executive Director of Technical Services Mark S. Graham's column "Unintended consequences," January issue, page 23. Graham brings up a number of good points, and his recommendations reflect sound design practices. Not knowing any details regarding the roof systems that experienced moisture accumulation, I cannot comment about them specifically. However, I can point to billions of square feet of reflective roof systems installed during the course of four decades that have providedand continue to provideproblem-free service.
I would suggest the design principles Graham outlines are equally applicable to all membrane types. Perhaps the problems being reported and encountered are because of the ever-growing trend to value engineer roof systems to cut costs.