Does Bleach damage Asphalt shingles?
I have some roof shingle mold/mildew, and was going to try Jay J's suggestion of 1 cup bleach to 1 gallon water, but was concerned that the bleach would damage the asphalt aspect of the shingles. Anyone know if it does/doesn't?
I dont think there will be a problem .You might test a small area before applying over complete area. If you are having mildew or molding problems,can be caused by overhanging trees, especially nut bearing, or softwood trees. also, you need to get more attic ventilation, eve vents, soffit vents, power vents or turbines. what creates mildew is inside warm temps coinciding with outside cool air. need to equalize attic temps by adding more ventilation. the bleach water combo will only last a few weeks before returning to same status.