April 2010
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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 provided—and continue to provide—problem-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.

Stanley Graveline
Sika Sarnafil
Canton, Mass.



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