If you have asphalt shingles adorning your rooftop, you most likely enjoy the benefits they provide in keeping water from getting inside your home. This type of shingle however, is prone to black algae staining, especially if you live in an area prone to excessive humidity levels. Removing and keeping these stains away from your shingles will improve their appearance as well as keep them intact for a longer duration. Here are some steps you can take in eliminating and keeping black algae away from your roof's shingles.
Keep Your Rooftop Free Of Debris
Removing branches and clumps of leaves from your rooftop regularly will help keep black algae from surfacing as quickly. When debris is left in place, moisture tends to accumulate underneath, leading to saturated shingles. Since black algae is formed when airborne mold spores land in a moist environment, it helps to keep your rooftop dry so they are less prone to growth. Cut back any tree limbs which shade your rooftop as well.
Hang Gutters On Each Roof Tier
If your home has more than one tier of roofing, the bottom tier will be at risk for black algae if gutters are not placed on an upper tier. This will help redirect moisture away from the home, keeping the surface drier and thereby less likely to become victim of an algae problem. Take the time to clean your gutters after storms to remove debris so water flow is not restricted.
Use An Appropriate Cleaning Solution
Cleaning your rooftop regularly will help keep black algae from accumulating. It is important to cover any foliage around your home before applying a chemical agent. Mix half a cup of trisodium phosphate (TSP) with a gallon of water. Add a half a gallon of bleach. Bleach and TSP work well at removing mold and mildew from a variety of surfaces. You may need to use a sponge to scrub the area with discoloration for a favorable result, then use a pressure washer or garden hose to remove the substance afterward.
Consider Algae-Resistant Shingles
If you find that algae returns frequently, you may want to consider having a new layer of shingles placed over your existing ones. Algae-resistant shingles are made with copper granules in their composition, helping to keep discoloration at bay. When it comes time for a roof replacement, ask your contractor about this medium so algae no longer becomes a problem you need to deal with.