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Is Moss on my roof a serious problem?

by Roofing Admin on 11/19/2008

My house is 24 years old and I have lived there for the last 4 years. I’m not sure what the age of the roof is but it’s possible that it’s the original one. The roofing material is beige asphalt shingles and approximately 80% of the northern facing section of the roof is blackened and full of moss. What can i do to fix this? Is it a serious problem? – Kevin

It can be a serious problem. Depending upon how thick the moss is it can cause water to back up underneath the shingles and cause a leak. A roof leak can be anything from a small annoyance or an expensive problem depending upon the size of the leak and how quickly you catch it

A common way to deal with moss is to pressure wash it clean and treat it but given the age of your roof I would not recommend this. I would guesstimate that you are looking at a new roof in the next 3-5 years so treating it might end up being a waste of money. For your situation I suggest using a garden hose to hose down the moss and using a broom to get as much of the moss off as you can.
Close up of moss on a roof
Whenever you get on a roof you need to be concerned about safety and particularly so when there is moss which may be more slick than the asphalt shingles. If you are not sure you can safely broom the moss off yourself call a local roofing contractor for the project.

Today’s question was answered by Dan Elsom, Founder and President of Elsom Roofing, INC . Elsom Roofing is located in Walla Walla, Washington and services the Walla Walla Valley.

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