Algae and moss may spring on the areas on your roof that don't receive enough sunlight. This is because algae and moss thrive in moist places and since such areas on your roof rarely dry out, they make a perfect environment for their growth. Algae can damage your roof. First, it will affect the aesthetic appeal of your roof by appearing as stains. Besides, since algae hinders the complete drying out of the shingles, it may lead to premature aging. In addition, the areas with algae and moss on your roof will hold moisture longer, reducing the service life of your roof. Algae and moss are common on asphalt roofing systems and here are ways you can keep their growth at bay.

Trim Any Adjacent Tree Branches

Tree branches that extend to your asphalt roof are often some of the major culprits of algae and moss growth. When tree branches are left to touch your roof, they will not only block direct sunlight on some areas on the roof but also ensure dirt and debris from the leaves and branches accumulate on your roof, both of which will facilitate the growth of algae and moss. Therefore, make it a habit to trim the branches of any trees near your house.

Clean Your Roof Regularly

Some roof maintenance procedures, especially cleaning, are usually overlooked by many homeowners who may feel it is unnecessary. Don't be a victim. Routine cleaning with non-abrasive cleaners will keep your roof clear off debris and dirt, minimising the chances of algae growth. When cleaning, pay much attention to your roof gutters. Dirty and poorly maintained gutters are the excellent environment for algae growth. Accumulation of dirt in your gutters interferes with the drainage and with algae thriving in moist areas, you don't want your roof to have poor drainage.

Install Zinc or Copper Strips

Installing zinc or copper strips along the ridge lines will help kill the existing algae slowly and prevent further growth. These metal strips or flashings prevent the accumulation of water on the roof by allowing it to wash over them down your roof surface.

Consider Asphalt-Resistant Shingles

This is an ideal choice if your asphalt roof is considerably old and you are considering re-roofing. These shingles are usually treated with chemicals that make them resistant to growth of moss or algae on the roof. However, this may not make your roof algae or moss proof so regular maintenance is key to ensuring the resistance works.

Consult with roofing contractors to better determine the condition and overall health of your current roof.