Mossy Roof

Is Your Roof Green or Just Plain Overgrown?

When your roof is green for the wrong reasons, the results can be damaging.

Algae on your roof doesn’t make it a green roof. With the current “green roof” trend, it’s not uncommon to see plants sprouting on top of homes and businesses. Unwanted roof growth, on the other hand, is damaging rather than environmentally conscious. This kind of green can threaten the integrity of your roof, resulting in damage to the surface and the underlying structure.

What’s Growing on the Roof?

Several common types of growth can cause roof problems. Moss is the most recognizable, popping up between shingles as small tufts of green. These tufts hold moisture, keeping the roof damp and encouraging the growth of mold.

Mold comes from a wide variety of fungal spores that can spread quickly. This not only weakens the roof but also has a tendency to cause health problems, especially for people with allergies. Some types of mold lead to serious infections that require medical treatment.

Lichen is a mixture of algae and mold that grows in green “splotches” on shingles. Collections of powdery spots mean that you’re dealing with mildew, a common problem in damp climates. Plain old algae is also commonly found growing on roofs in streaks or spots of green, blue-green, or black.

All types of growth can cause wooden roof shingles to rot and asphalt shingles to erode. This opens up gaps between shingles that let in water every time rain falls or snow melts. The end result is the same: a compromised roof structure that will need to be repaired long before it reaches the end of its intended lifespan.

Damage Prevention Through Roof Maintenance

Routine cleaning and maintenance of your roof is essential to preserving the materials and prolonging the life of your home. There are a few simple steps you can take to remove existing greenery and prevent its recurrence, including:

• Choosing roof materials that resist growth
• Trimming trees and other plants away from the roof to prevent moisture buildup
• Using commercial roof cleaners and growth inhibitors to combat mold and mildew
• Hiring a professional service to remove severe growth and perform regular cleaning

When cleaning the roof yourself, avoid products containing chlorine bleach because they may strip the color from the shingles and create runoff that can damage your lawn.

If you look up to find that your roof has bloomed into a mess of greenery, call Interstate Roofing. We offer extensive roof cleaning services that can get your Portland home back into top shape before serious damage is done. Contact us when you’re ready to give your roof a brand-new start.