Protect Your Roof from Moss and Algae

Washington residents know when it rains, it pours in the Northwest. With record rainfalls sweeping through Washington and Oregon, homeowners must be on the lookout for damage caused by the excess of water and moisture. While many do an excellent job of keeping an eye out for pipe leaks, slab leaks, water damage and other more obvious household problems, they may not realize their roof could be suffering the most from damage caused by excessive moisture. In such humid and precipitous areas as Spokane, homeowners may need to check their roofs often for signs of moss or algae growth, or else pay big for an unsalvageable roof.

Algae growth is often mistaken for mold or mildew because of its color. When roofs are constantly damp, algae growth is encouraged, creating dark streaking on the shingles. Moss, on the other hand, is a plant that receives the water it needs through its leaves and thrives in moist regions with little direct sunlight. Both moss and algae spores are carried by animals or wind, allowing one moss- or algae-covered roof to spread to an entire neighborhood.

In addition to negatively impacting your home’s appearance, algae and moss growth can damage your roof’s shingles and functionality. When covered in algae, reflective roofs, which are intended to reflect heat and light away from the home, keeping it cooler overall, may suffer a dramatic decrease in performance. Moss growth can lift shingles from the roof, causing curling, and making the roof’s shingles susceptible to breakage or removal during storms or high winds. Curled shingles also fail to drain water properly, allowing moisture to seep into the roof and creating a perfect environment for water damage and mold.

If you’ve noticed your roof is cultivating colonies of moss and algae, the first step to take is to clean your roof as thoroughly as possible. Use a brush or broom to gently and carefully scrub away the moss already clinging to your shingles. Once the largest sections of moss or algae have been removed, kill off the rest by spraying a solution of one part laundry bleach, one part water all along the roof and allow it to sit for about 20 minutes. This solution prevents further growth, and rains will wash away the dead moss or algae. Avoid using a pressure washer to remove stubborn growths as the jet could severely damage the shingles.

Discourage algae and moss growth on your roof by removing any sunlight obstructions such as trees or branches, keeping your roof free of debris and using a leaf blower to dry and blow away moisture or debris. You may also choose to invest in zinc or copper striped shingles which discourage algae and moss growth.

Your roof is one of the most important elements of your home. Ensure it remains functional and attractive with proper maintenance and care from the roofing professionals at Alpine Construction. To receive your free estimate, contact us online or call 509-448-8099.