You could seal over each screw with a good sealant but, really, this is not as big of a concern as it was once, thanks to improvements in fastener design and quality.
Todd Miller
2013-02-15 09:58:53.000000
I had a metal roof put on my house last year and I was later told that the biggest con against metal roofs is the deteriation of the rubber washers after 5-7 years. I there a coating available that will protect these washers?