In the old days the question about painting metal roof aroused often. It had to do with the fact that the roof was made of tin-panels. This kind of metal surfaces needed to be painted for two reasons. Firstly, a thin layer of paint quickly comes out as a result of aggressive environmental influences (precipitation, salts, exhaust gases, etc.) and the roof begins to rust. Secondly, painted metal had better appearance and looked much more appealing than unpainted. So, in this case the roof was painted every 3-5 years.
Today’s metal roofs with proper maintenance do not need any repairs for more than half a century. Modern panels are made of hard zinc-coated metal (275 g/sq.m. of Zinc or G90) that are corrosion-resistant. As for the paint: most manufactures provide at least 30 years of warranty that the paint will not shade. So, there is no need to paint the roof for at least three decades, unless you have a sudden urge to change the building’s style.
You do not have to, but, yes, you can. You do not want to get to work if you did not let the roof weather for at least 6 months. However, make sure along that you have chosen the right paint (Acrylic latex or oil-based alkyd paint) and that you are using the appropriate primers and sealants. Check the specifications and follow the instructions on the paint can. Some substances have added benefits such as UV-reflection, fire-resistance, and insects-repel qualities.
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