Will Silicone Harm Rubber Washer Om Metal Roof

This oily film prevents the silicone from getting a good hold on the roof itself.

Will silicone harm rubber washer om metal roof.

When this happens the washer has nothing to seal against. Silicone coatings are less elastic than comparable coatings and have a tendency to crack and peel quickly. Screwing into plywood isn t a great idea. These roofs are all single ply membranes that often have an oily film on them at installation.

While these coatings are effective against water they get dirty and lose reflectivity up to 45 and any energy savings very quickly. If your screws are hitting the rafters replace the short screws with new longer screws with new rubber washers. If you decide to go with a metal roof then that guarantee might stretch out to 50 years or more. Even then after 15 20 years its not a bad idea to have someone go up on the roof and inspect the fasteners.

When you choose to work with a silicone roof coating instead then the product may provide you with a 10 year warranty or sometimes longer but some providers might only give you 5 years of protection. Occasionally a screw misses the mark altogether and misses the metal strut or wood framing that it needs to bite securely. As the oil comes off the roof the silicone will too. Most roofers install metal roofing on purlins 1x4 or 2x4 strapping installed parallel to the ridge giving the roofing screws something better to bite into.

This protects the rubber from the uv rays of the sun greatly prolonging its life span.