How to clean a metal roof before painting with no doubt
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Wash the metal thoroughly with a degreasing agent such as trisodium phosphate. When you're ready to get started, spray your roof using a garden hose with a. It is recommended that cleaning either of these be accomplished with a mild solution of detergent.
Use a power washer to wash the entire surface and let it dry for at least an hour.
It’s important to clean off any dirt, debris, rust or any other grime from the surface of your roof before painting. I considered trying to use a pressure washer but there was no good way to access the entire roof with the wand, and i was also concerned that i might inadvertently catch the edge of a shingle and end up ripping a couple off by accident. It should be relatively clean, but i will use wire cup brush to clean the rust off before painting, so that may introduce some contaminants. There are instances where no cleaning tools other than water are necessary.
