O'Fallon Roofing: Article About Eliminating Moss On Shingles
Algae and moss are two of the most common types of growth that occur on roofs. Both can turn a roof into an eyesore and ruin its curbside appeal, but that is not all of the damage they cause. O'Fallon roofing contractors warn that moss can actually compromise shingles, underlayment and even the sheathing itself. Although moss doesn't have a root structure, it does tend to grow in a way that mimics a root's invasiveness.
Moss requires three conditions to thrive: shade, moisture and temperatures between 32 and 70 degrees Fahrenheit. If the growth is dense, moss can actually survive extended periods where these conditions aren't present. If you can cut back trees to give the affected area of the roof more sunlight, that may fix the situation over the long-term. A common source of moisture on a roof is piles of leaves, pine needles and other organic matter. Eliminating those will help the situation as well.
Even if you correct the conditions that are allowing the moss to thrive, it can take a long time for that moss to go away, and the shingles may be stained. Usually, you'll want to clean the roof and actively kill the moss.
A roofing contractor from ACI Exteriors of O'Fallon MO would be happy to answer any questions you have about siding or TPO roofing systems.
Zinc sulfate is a popular choice for dealing with the moss, and using a household detergent and oxygen bleach in the mixture can eliminate stains.
If the moss has been there long enough, you may not be able to save all of the shingles and other roofing materials. In fact, removing the moss can actually expose leaks and other issues that weren't evident when the moss was in place. In situations like this, it's best to call in the professionals.
Sometimes, it simply isn't possible to eliminate the conditions causing the moss. One option is to proactively use zinc sulfate seasonally. However, there are more permanent solutions. If you have to reroof, you can purchase shingles with zinc mixed in with the granules. For an existing roof, you can install zinc flashing. In both cases, rainwater reacts with the zinc and kills moss, algae and other growth.
Roof warranties don't usually cover moss and similar situations. The exception here would be shingles, flashing and other materials that are made to resist this type of growth. Most home insurance policies don't cover this type of work. Insurers consider this type of maintenance to be a homeowner's responsibility. That means that an insurer may not cover damage caused by the moss as well, and some companies will even seek to cancel policies due to situations like these.