Roof Moss & Lichens in Philadelphia

Roof Moss & Lichens in Philadelphia

Roof moss is more prominent on sections of Philadelphia roofs that are shaded and periodically exposed to damp cool weather conditions.The presence of shade on a Philadelphia roof surface has a direct correlation to the amount of roof moss or lichens growth. The combination of shade and cool moist conditions increases the likelihood of roof moss or lichens growth.

Asphalt shingle roofs and wood shingle/shake roofs in Philadelphia are at the highest risk for roof moss or lichens, which is not only a cosmetic issue. Roof moss and lichens capture and hold moisture against the roof surface, which speeds the wear of the roofing material. Periods of freezing weather in Philadelphia increases frost damage to the mineral granule coating on asphalt shingles and may cause cracking to wood shingle/shake roofs.

Roof Moss vs. Lichens

Roof moss growth is thicker than lichens, thus roof moss will hold more moisture for longer periods of time.

If only lichens are growing on your Philadelphia roof surface, attempting to clean it may cause more harm than good to the roofing material, as it is usually very thin.

How to Clean Roof Moss & Lichens-covered Philadelphia Roofs

You may attempt to clean the roof moss or Lichens by brushing or raking the roof moss or lichens off. Any roof surface brushing or raking should be done with great care to minimize damage to the shingles underneath. If the shingles underneath the roof moss seem aged and frail, work gently by hand on a small area first to see the condition of the shingles below.

If the roof shingles are in fact fragile, brittle, cracking or curled, the cleaning process

may cause serious damage to the roof. Aggressive cleaning may reduce the life expectancy of the roofing material. In these cases it is best to call your local Philadelphia roofer as a new roof is most likely needed to protect your home. Russell Roofing provides free estimates in Philadelphia and is considered one of the best roofing contractors Philadelphia has to offer.

Russell Roofing replaces roof moss with new asphalt shingle roof and copper flashing

Roof Moss & Lichens in Philadelphia

Using a soft brush or power washer:

This must be done with care.  The process of power washing, brushing or sweeping an asphalt or wood shingle roof can damage you Philadelphia roof by cracking shingles or loosening the protective mineral granules on the surface of the shingles.

Use a flexible leaf rake to gently rake the roof moss off of your Philadelphia roof. Brushing may be easier. Debris left on the roof after raking may make it difficult to see the actual condition of the roof shingles. After raking, gently wash off debris with a garden hose. Otherwise the debris will wash down and may clog your gutters.

Preventing Moss & Lichens Growth by Installing Metal Flashing on Your Philadelphia Roof

It has been observed that galvanized metal, copper, and aluminum flashing contain mineral salts, which gradually wash off and help to retard roof moss or algae growth on the shingles. Copper flashing or other metal flashing strips along the ridge of the roof will slowly remove moss or lichens during periods of rain, when rainwater washes over the metal and down the roof surface. Installing metal flashing will help in the prevention of future or further roof moss or lichens growth on your Philadelphia roof.

Increasing the sun exposure on your Philadelphia roof surface, by trimming back trees whose branches may create shadows on the roof, will also help reduce the possibility of roof moss or lichens. Keep your Philadelphia roof clear of any debris such as leaves or pine needles, which may collect in valleys and other areas of the roof.


Leave a Reply