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Roofing granules are made from crushed stone and minerals. With today's advanced manufacturing techniques, these granules allow roofing manufacturers to create asphalt shingles of virtually any color, size and shape. These small colored stones are one of the most important parts in the composition of asphalt shingles together with bitumen as well as the supporting inlay from fiberglass. Learn more about the shingle production process.
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Removing algae and moss from your roof
When living in a humid area, it’s possible your roof is covered with lichens, algae and moss. They can grow on every type of roofing material: bitumen shingles, concrete and/or ceramic tiles, slates or even painted metal sheets.
Moss on bitumen roof shingles, concrete tiles, ceramic tiles and painted metal sheets. >>>
Unfortunately the stains these organisms leave on bitumen roof shingles make your house look terrible and sometimes desolate, which reduces the value of your house. In some cases, these stains are a rather cosmetic issue. But in some cases these stains are symptoms of something much worse. It can lead to serious damage or even roof failure. Sometimes it can be easy to find the causes of the stains, and even to get rid of them and prevent them from recurring.
Common causes of staining
Dark stains on a bitumen shingles roof could be caused by different causes:
1. Algae growth
Blue, green or black stains on a bitumen shingle roof are mostly caused by algae. These algae staining begins with small spots. Over time these spots can develop into streaks. Algae stains are often mistaken for mold or mildew. Algae may hurt the appearance of your shingles roof, but other than that it is not harmful at all.
Algae stains on bitumen roof shingles:
2. Moss
Velvety green masses of moss often grow on the north-facing side of roof surfaces and on tree-shaded roofs. Unlike the above mentioned algae, leaving moss on your roof surfaces can develop bigger problems. By infiltrating the roof structure underneath the shingles, moss can make the shingle edges lift and curl. This can lead to cracking and blow-off during high winds and storms. Another effect of heavy moss growth is the forming of dams which can cause water to back up underneath the roof shingles and damage the roof deck. Best thing to do is clean off moss as soon as you notice it on your roof!
Moss on shingles roof >>>
DIY Algae and moss removal recipes
Luckily both algae and moss can be easily removed from shingle roofs. DIY stores sell many popular liquid solutions that are specifically made to kill the moss. Or you can make your own moss remover in a large spray bottle with one of these four DIY recipes:
- • 240 ml dish washing soap + 7,5 liter of water
- • 450 grams powdered oxygen bleach + 7,5 liter of water
- • 500 ml chlorine bleach + 7,5 liter of water
- • 500 ml white distilled vinegar + 7,5 liter of water
When using one of these homemade options, you should wet down the roof with plain water first, then apply the cleanser and let it rest for 20 to 45 minutes. Lightly scrub your roof with a soft-bristle brush, and then rinse with water.
