Guest User
9/24/2002
We recently moved into a house with a metal roof above our front porch. The home and the roof are only 3 years old, but the paint has faded considerably and the roof itself has some small patches of rust (dime sized). I am planning on treating and repainting the roof (hopefully with something a bit better than what the builder put down) and would like some advice as to what I should be doing. I assume that I should sand the roof, treat with a metal primer, and then paint. Are there any general guidelines as to what kind of paint, primer, etc. I should use. This isn't a huge roof, it is over our porch only. The rest of the house has "standard" roofing material. Thanks! Todd
Todd Miller
Classic Products, Inc.
9/25/2002
Hi Todd, Your "plan" sounds pretty good. I would try just power washing the roof first to see if that does a good enough job of knocking off any loose paint. If you do sand it, especially in the areas where there is no rust, be careful to not sand into the metallaic coating (either galvanized or galvalume in all likelihood) on the metal. That would further shorten its life. As for a paint system, I would go to a quality paint store and use whatever primer and top coat they suggest for repainting metal roofing or siding. The other alternative is to buy an air-dry Kynar paint. You would probably have to contact a metal roofing manufacturer, though, in order to get some contacts to buy air-dry Kynar ... and expect to pay a couple hundred, or more, dollars per gallon for the paint.
Guest User
9/25/2002
I have a 100+ year old bank barn with a standing seam roof. It was painted with aluminum asphalt fiber coating about 10 years ago. It is still in pretty good condition with just a few small areas of rust. I want to keep ahead of it and have it repainted. I have had a couple of contractors out and they have all suggested different methods, from completely stripping off the old paint to just spraying on a new coat. I would appreciate an opinion from a disinterested third party. Thanks, Jim
Todd Miller
Classic Products, Inc.
9/26/2002
Adhesion is the primary concern/factor. This would be looking at adhesion to the metal and, if any of the old paint is left in place, adhesion between the old and new paint. If the current layer(s) of coating appear to have strong adhesion to the metal, they could be left in place. If, however, they can be easily chipped or broken loose form the metal, then the old coating should be stripped as best as possible by power washing or other method. Just be careful to not damage the metal itself. When repainting, regardless, I would use a primer followed by one or two layers of finish coat. Be sure to allow dry time between coats. To find a quality coating, go to a local paint store, tell them the details of what the new coating will go against, and use what they suggest for best adhesion. There are also air-dry Kynar coatings today which would be noted for their fade resistance. These generally are not available direct to consumers but could be obtained by contacting metal roofing manufacturers in most cases.
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