Will Silicone Harm Rubber Washer Om Metal Roof

If your screws are hitting the rafters replace the short screws with new longer screws with new rubber washers.

Will silicone harm rubber washer om metal roof. Silicone coatings are less elastic than comparable coatings and have a tendency to crack and peel quickly. So we offer a primer that cleans off this oily film and allows the silicone to adhere perfectly. If a screw is driven into the metal roofing panel at an angle the rubber washer cannot sit flatly on the roof and will not seal. These roofs are all single ply membranes that often have an oily film on them at installation.

As the oil comes off the roof the silicone will too. If you decide to go with a metal roof then that guarantee might stretch out to 50 years or more. This protects the rubber from the uv rays of the sun greatly prolonging its life span. While these coatings are effective against water they get dirty and lose reflectivity up to 45 and any energy savings very quickly.

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. When this happens the washer has nothing to seal against. Occasionally a screw misses the mark altogether and misses the metal strut or wood framing that it needs to bite securely. Even then after 15 20 years its not a bad idea to have someone go up on the roof and inspect the fasteners.

The metal washer covers the neoprene rubber seal almost completely leaving only a thin edge exposed.