How To Look At A House

McGarry and Madsen's home inspection blog for buyers of  

site-built, mobile/manfuactured and modular homes

What is the stuff you paint an old mobile home metal roof with to extend its life?

Wednesday, October 3, 2018

Elastomeric roof coating is produced by numerous paint and roofing products manufacturers, but the best-known brand is KOOL SEAL. It’s the consistency of Elmer’s Glue in the pail and is applied with a thick-nap roller and throw-away brush. When dry, the elastomeric coating forms a rubber-like protective white skin over the roof. It also has a high reflectance factor that reduces the temperature of the roof during the summer.

   You should first remove any loose dirt and debris from the roof surface and clean it with a mild detergent or TSP solution. Then let it dry before beginning the coating process. 

   Most manufacturers of elastomeric roof coating also offer a patching cement (with a paste consistency) for repairing any small cracks in the roof—which is the next step after cleaning the surface. A coat of patch cement is applied to each problem area, then a 4-inch wide strip of reinforcing mesh is pressed into the wet patch cement, and finally a second coat of the patch cement is brushed over the mesh to encase it.

   After the patch areas dry, apply the coating. Because it takes several hours of warm weather for the material to harden, you should not apply it on a day when the temperature is below 60º F or rain is expected, and do not apply it so late in the afternoon that it doesn’t have a few hours to dry before dark.

   Coverage is about 100 sq. ft. per gallon, with two coats recommended. So, figure on needing about a gallon for every 50 square feet of roof. Depending on the brand you choose, expect to pay between $100 and $150 per 5-gallon bucket. You will need to repeat the coating every five years to maintain its effectiveness. 

    Also, see our blog post Is a metal roof for a mobile home approved for HUD Wind Zone 3?

       Visit our MOBILE/MANUFACTURED HOMES  page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.

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