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TOPIC: I Have An Existing Metal Roof and Have A Question

Hex head neoprene washer fasteners

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Is there a way to tell if the fastener has been installed too tightly just by looking at it? How tight is too tight? Does the neoprene need to be cracked and/or squeezed out? Is just a dimpled surface too tight, especially if the metal is unsupported (no sheathing) underneath? Any references I can look at for this? The ones I found don't give the answers to these questions.
Thanks.

Jim Cohen

6/25/2018
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Figure2-37

Pretty good picture here.

Eric Novotny
Eric Novotny
An informed customer is the Best Customer!

6/25/2018
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Thanks. So is any observation of a washer protruding up around the lip of the washer no good? What if it is just squeezed to the side?

Jim Cohen

6/25/2018
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If it is squeezed to the side, that typically indicates being installed out of level which is not ideal.

That said, the washers are designed to accommodate some less than perfectly perpendicular installation.

Biggest issue with exposed fasteners that we see is being installed way too tight.

Eric Novotny
Eric Novotny
An informed customer is the Best Customer!

6/25/2018
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Last question - what about dimpling? Image attached. And many thanks for the quick responses. IMG_2531a.jpg

Jim Cohen

6/25/2018
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