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What's Eating Your Roof?

Updated: Apr 8, 2022

There are three main threats to your roof. These living organisms shorten the lifespan of the single most expensive component of your home, your roof!


The black "stains" on your roof are actually large colonies of airborne algae called Gloeocapsa Magma. This blue green algae feast on the limestone filler found in shingles. As they eat, they grow and spread into billions until they cover your entire roofs surface. This can cause destruction to your roof system leading to premature roof failure.


A lichen is an organism that evolves from algae. Lichens firmly attach themselves securely to the shingle. As a result, if left untreated, they will remove the top layer of your shingle, the clear coat, and will permanently scar the shingle surface.


Moss is a plant organism that can grow on many surfaces. If your roof is partially or fully shaded combined with our humid environment here in Delaware, it is an ideal breeding ground for moss. If you spot this grassy organism growing on your roof, take action immediately! Moss growth causes excess moisture to remain trapped on your roof, causing shingle deterioration and roof rot. If left untreated, you may significantly shorten the lifespan of your roof.

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