Metal roofs have been associated in the past with tin-covered storage sheds or copper-domed cathedrals. But today's panels of corrugated aluminum or galvanized steel are practical and attractive options. Roofing is one of the most dangerous home improvement jobs.
Metal Roofing
Metal roofing is usually manufactured in steel, copper, aluminum or stainless steel and installed as panels, even if it looks like individual tiles, shakes or shingles. It can be coated in a many different types and colors of paint and other materials. Modern metal roofing frequently carries warrantees of 50 years--if properly installed.
Elastomeric coatings seem like a great idea. A new chemistry that promises to both seal your roof and stop roof leaks, while it reflects sunlight and lowers your air conditioning bill. The home owner can apply it themselves with a paint roller and long handled extension, without ever having to climb around on the roof.
It's too bad, but in my experience, it seldom works this way. The products stick well to bare metal and maintain their reflective qualities. I don't think they hold up well where they have been applied over other patching material. While they have some ability to stretch (that's why they are called elastomeric).
If you choose to try these products you will want to make sure your roof is clean with no loose material from previous patches. You may want to apply primers with mesh around vents and other roof penetrations before coating the roof with an elastomeric product. If you do that, give these repair a few weeks to set before you try covering them with the elastomeric coating.
Elastomeric coatings are applied with a roller. You can do that from a ladder alongside the house if you have a long roller handle. That is probably safer (for both you and the roof) than crawling around on the roof with a short handled roller.
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