Roofing protects indoor areas from moisture, sunlight, and temperature fluctuations. However, if certain growths form on the shingles and flashing, they may diminish the appearance of your property and cause structural issues. Fortunately, professional power-washing can keep your roof clean and prevent problems. Here's what to know about roof cleaning and its importance. 

What Are Some Problematic Growths on Roofs?

If airborne algal spores land on your roofing, moisture and sunlight can germinate them, causing algae to grow on shingles. As they reproduce, they can leave large blue-green spots or streaks. Some materials, such as asphalt shingles, may contain limestone as a filler. Limestone is a plant nutrient that algae use as fertilizer for growth, and as these microbes consume it, the algae may darken in color, turning gray or black.

Lichens are organisms that grow symbiotically with algae and may emerge from algal buildups on roofs. These growths, which typically have a fuzzy appearance and pale green color, can develop deep root systems that penetrate roofing materials in search of water and nutrients. 

Wind, insects, and animals may carry fungal spores onto your roofing. When humidity or standing water germinates them, you might notice mold and mildew, which look like black patches or streaks. If outdoor conditions remain wet, these fungi may reproduce rapidly and cover large sections of your roof.

How Can They Damage Your Home?

As algae consume limestone, they can deteriorate shingles and cause granule loss. As a result, your roof's underlayment may become exposed to moisture from rainfall, which can seep through weaknesses and leak into indoor areas. This may lead to mold growth in your attic, along with water damage to your property structure and belongings. 

As the root systems of lichens spread and grow deeper, they may damage shingles and roof underlayment. In addition to making them difficult to remove, their invasive roots may create small holes and fissures in the roofing, allowing moisture to seep through and enter your residence. 

Once mold and mildew populate on shingles, they may quickly reproduce on inner layers of roofing material. This can cause wood shingles, rafters, and fascia to soften and rot, compromising your roof's structural integrity. Additionally, soft and decaying timber may be easier for insects and rodents to chew through. 

How Can Power-Washing Help?

Power-washing involves using a pressurized stream of water combined with cleaning products to remove algae, lichens, and fungi from shingles. A professional can use the correct psi (pound-force per square inch) and properly diluted chemicals to remove growth without damaging your roofing materials. Eliminating buildups as soon as you notice them may prevent property damage and pest infestations. 

Keep your roof clean with help from Harbour Painting. They provide power-washing of roofs, siding, and gutters to homeowners throughout New London County, CT, and the surrounding areas. They'll use the right tools to get rid of problematic growths and extend the life span of your roofing system. Call (860) 444-0705 to book an appointment, or visit their website to learn more about their services.