What Can I Put on a Metal Roof to Stop Leaking Water?

About Metal Roofs

• Metal roofs generally are made from galvanized steel or aluminum, although some are composed of copper and zinc. Metal roofs may be in joined sheets or shingles. Corrugated metal also can be used. They come in a variety of colors and generally are coated with anticorrosion and UV-protectant chemicals to provide a long-lasting finish. Metal roofing materials usually are joined with screws and seams. Manufacturers generally provide warranties that cover the roof for 30 to 50 years, according to the Metal Roofing Alliance website.

Metal Roof Problems

• Metal roofs can develop several kinds of problems, because of their construction and composition. Steel roofs can develop rusting from exposure to the elements. Most steel roofs are galvanized, which reduces corrosion problems. Aluminum roofs do not rust, but they can develop an oxidized coating from moisture. Expansion and contraction from temperature changes can cause small failures in material joints that lead to leaks.

Leaks In Metal Roofs

• Older metal roofs that were fastened with nails can develop water leaks when the nail holes expand and enlarge. Newer roofs are fastened into place with screws that do not create this problem. Even with the protective coatings that are applied to metal roofs, corrosion can develop in small areas where the coating becomes compromised. If not quickly repaired, these small flaws can cause intrusion of water into materials beneath the roof and ultimately lead to water leaks into the interior of the home. Homeowners should inspect their roofs annually to find and repair small problems that could lead to larger ones.

Repairing Leaks In Your Metal Roof

• Unless you repair small problems on your roof immediately, water can run beneath the surface materials and deteriorate underlying structures. This problem will create more expensive repairs at a later time. You must seal expanded fastener holes with tar or other waterproof roofing material. Small holes in the metal can be patched with a piece of metal cut slightly larger than the hole, positioned under the roofing material and fastened securely into place, according to the Mother Earth News website. For more widespread problems of water leaking through your metal roof, consult a contractor for advice on waterproof coatings that are available.