By Travis Hill
Professional Inspector #20446
As a professional inspector with Premier Inspections, the roof is an important part of a general home inspection. Stains on asphalt roofing shingles make a house look shabby, which detracts from its value. In some cases, stains are merely a cosmetic issue. Sometimes they’re symptomatic of a problem that, if left unchecked can lead to more serious damage and eventually roof failure. It’s not always hard to distinguish the causes of stains, nor, in most cases, to get rid of them and prevent the stains from recurring.
Eroded mineral surface
If the roof-covering material has been on the house for 15 years or so, it could be that the surface granules are wearing off the shingles and the asphalt base is starting to show through. On older roofs, you may additionally see cracked and/or shingles with curled edges. If you determine that age and wear are the causes of darkening, it may be time for a new roof.
More often than not, blue, green or black stains on an asphalt-shingle roof are caused by algae. Algae staining begins with small spots which, over time, can develop into streaks. Algae stains, which are often mistaken for mold or mildew, aren’t harmful to anything other than the appearance of asphalt shingles, but nobody likes the look.
Algae-stained asphalt-shingle roof (photo by Premier Inspections)
Green, velvety masses of moss often grow on north-facing roof surfaces and on tree-shaded roofs. Unlike algae, moss left on roof surfaces can develop beyond an aesthetic problem. It can infiltrate the roof structure underneath the shingles and make their edges lift and curl, which can lead to cracking and blow-off during high winds and storms. Heavy moss growth can actually form dams that can cause water to back up under the shingles and damage the roof deck. It’s best to clean moss off a roof as soon as you notice it’s growing there.
Both algae and moss can be easily removed from asphalt shingles with a 50/50 solution of chlorine bleach and water. Laundry-strength bleach is sufficient, or you can opt for any of a number of proprietary roof cleaners, some of which don’t contain bleach, lye, or other potentially harmful chemicals.
Since bleach and some cleaners can be harmful to plants and humans, it’s a good idea to take some precautions when working with them, including the following:
- Wait for a calm, windless day to clean your roof.
- Spray landscape plants near the house with water and cover them with tarps to protect them from chemical over spray and runoff.
- Wear protective clothing, including long sleeves, pants and gloves, as well as goggles to protect your eyes, and shoes with high-traction soles.
Before climbing up to clean stains from your roof, be aware that about 30,000 people fall off ladders and roofs each year. Consider using a safety harness, just as the home inspectors pros are required to do, and follow the common-sense rules for properly positioning and using a ladder, which can be found in Premier Inspections home page. Also, be sure to notify someone that you’ll be on your roof. In case of an accident that incapacitates you, you’ll want someone to know where to look for you.
How to Clean Algae and Moss from a Roof :
Apply the bleach solution with a garden sprayer. Let it stand on the surface for about 20 minutes, then rinse it off with spray from a garden hose. Don’t let the bleach solution stand on the roof for more than 30 minutes or so without rinsing. And don’t use a pressure washer, which can damage the shingles by removing their protective layer of asphalt granules.
If accumulations of algae or moss are heavy, at least some of it should wash off the roof surface right away with the stream from the hose. You can try brushing off algae and moss with a brush or broom with medium-stiff bristles, but don’t scrub too hard. You don’t want to separate the mineral granules from the shingles.
If chunks of algae or moss or heavy stains remain on the surface after rinsing, let the roof dry, then spray on the bleach solution again. Wait 30 minutes and rinse. Don’t worry if some staining remains after the second rinse. It should wash off over time with exposure to rain and sunlight.
How to Prevent Algae and Moss Stains from Recurring :
Algae and moss tend to grow roof surfaces that are shaded and retain moisture. So, it’s a good idea to cut away tree branches that overhang the roof and block sunlight. Keep the roof surface clean by blowing off leaves and fallen branches during seasonal maintenance.
Following these maintenance tips can help homeowners enjoy an attractive roof. They can also help extend the roof’s service life, which is important whether you plan to stay in your home or sell it in the future.