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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?
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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.
7/24/2004
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Or copy this URL: https://www.metalroofing.com/spirit/comment/3504/find/