In the damp climate of the Lower Mainland, moss often appears on BC roofing. These tiny plants may seem harmless, but beware: roof moss anchors itself by growing into the top shingle layer, where it acts like a sponge to hold water against the roof surface. This factor alone will speed roof deterioration by at least 10 years. Over time, this process also loosens the ceramic granules that cover a shingle, weakening its structure and leaving it bare to the elements. In addition, excessive growth can lift the edges of shingles, exposing your home to roof leaks and wind damage.
It may seem like moss growth has popped up on your roof overnight, but removing moss from a roof requires a bit of patience. It is possible to clean a mossy roof surface, but cleaning must be done gently to minimize damage to the shingles. Aggressive cleaning, such as power washing or sweeping, can break the shingles or knock off excessive amounts of granules. If you are uncertain about the condition of the shingles underneath moss growth, test a small area by gently brushing. If shingles appear to be worn out and fragile, it will be impossible to clean the roof. A new roof is necessary.
There are chemicals available that claim to kill roof moss, but these also risk damaging your shingles and contaminating the surrounding environment. Old-fashioned elbow grease may be a better alternative. We recommend a professional roof inspection if roof moss is a concern for you. Crown Residential Roofing can give you helpful tips to deal with the problem and extend the life of your roof. Call us today at (877) 907-3066.