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Discoloration of the protective covering of roofing systems has a variety of causes. Quick diagnosis of the problem, however, can be achieved by considering the stain color and its location on your roof.
Black Stains
This stain color can indicate a lot of things. For example, black stains on asphalt shingles can be due to debris from dead leaves and other organic material that’s been left on the roof’s surface. In roofs with chimneys, black stains may be caused by soot or nearby industrial activity. However, this stain color is often caused by extractive bleeding or the loss of black pigment in the asphalt shingles. If you see black streaks running down your roof, it is an indication of a defective roofing product.
Green Stains
Residential roofing systems can attract biological growth like algae and moss, resulting in green stains. These can appear wherever there’s moisture on your roof coupled with ample amounts of sunlight. While they don’t pose a threat to your roof’s structural integrity, these stains can reduce your home’s curb appeal. Bleach diluted in water or a solution of trisodium phosphate, together with low-pressure washing, can help remove these stains.
Red or Brown Stains
Either stain color can be found in certain areas of the roof where metal components are installed. Metal vents or flashings, for instance, can develop rust over time, causing red or brown stains to appear on the surrounding shingles or metal panels. Corroded metal roofing components must be replaced as soon as possible.
Keep your roof in good condition in both aesthetics and functionality with the help of our roof repair pros from Crown Roofing LTD . Our team has decades of combined experience, and we go above and beyond industry standards. Call us today at (604) 370-6288, or fill out our contact form to schedule a free roof evaluation and estimate. We serve residents of Surrey, North Vancouver and Vancouver.
