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exposed fasteners

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Guest User
7/24/2004
What is the true life span of neoprene washers on an average pitch (8/12) roof--it is my understanding that they can break down and fail in 20 years or less. Any insight on this?
Guest User
7/25/2004
Today's grommeted screws have metal caps which protect the neoprene. The life of the neoprene varies by climate. I think it is safe to say they are designed to last 20+ years in any climate. I suggest contacting manufacturers of through-fastened products abd asking for their experiences. Keep in mind that there are many many metal roofs with concealed fasteners which do not have to have washers.
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