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Roof Moss, Get Lost!




What Is Moss?

When it comes time for a roof inspection it is hardly a surprise to see moss. Moss, a resilient plant, travels via spores that surf the wind and settle on your roof's surface. Homes both old and new are subject to these spongy green patches.


So what conditions allow moss to grow?

Moss is typically found in damp, shady areas on the roof coverings. The North slope of the roof is a common location as it receives much less sunlight than south facing slopes. Valleys, where roof slopes connect, channel significantly more water and provide suitable areas for moss growth. Finally, shadows cast by trees, chimneys, and other roof penetrations become areas for ideal growth.



What happens if I do nothing?

Moss acts much like a sponge and holds in moisture. Many roof materials aren't 100% waterproof and work to 'shed' water. When they are kept in contact with water for prolonged periods of time they begin to deteriorate much faster than the normal rate. Furthermore, as moss grows it begins to develop a root structure which may lift shingles, exposing the substructure of the roof to the elements. In short, allowing moss to run rampant will reduce the lifespan of your roof!


What can I do about it?

If you have excessive moss growth on your roof we recommend a qualified contractor issue a repair. Roofs are inherently dangerous and coupled with the slippery nature of moss can create less than desirable safety conditions. Professionals also have the proper tools to clean roof coverings with the delicate requirements to prevent damaging your expensive roof components. Like many home repairs, a little cost in maintenance can help prevent major expenses down the line!





Author: Drew McKeown

InterNACHI CPI

License #162202





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Matsu Valley

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