It Only Looks Harmless: How Moss Can Destroy Your Roof

10 September 2018
 Categories: , Blog


If you've got moss growing on your roof, you need to make removal a top priority. Moss may look harmless enough, but it can actually destroy your roof a little at a time. Before you decide to leave the moss alone for a while longer, here are four things you should know about it.

Acts Like a Sponge

When moss grows on the roof, it becomes a natural sponge. The more water it absorbs, the heavier it gets. Once it absorbs too much, the water will begin to soak through to the underlayment of your roof. Because the moss does act like a sponge, it will retain the moisture for quite a while, which means your roof will stay moist. Unfortunately, that moisture brings additional risks for your roof.

Encourages Mold Growth

With excess moisture comes unwanted mold. The moisture that's leaking into your home is creating the perfect environment for mold to grow and thrive. The longer the moisture remains, the more mold you'll have in your home. Unfortunately, mold can be hazardous to your health. Even if you don't see the mold, it could still be creating a hazardous environment for you and your family. In fact, you could have mold growing in your ceilings, walls and attic before you ever see the first hint of green on the surface.

Causes Shingle Decay

While the spongy moss is growing on your roof, the moisture it's retaining is also eating away at your shingles, causing decay. The longer your shingles are exposed to the moss, the more serious the decay becomes. Eventually, you'll begin to notice the visible signs of shingle decay. However, once the decay is visible, the damage will be so extensive that the shingles will need to be replaced. Unfortunately, if too many of the shingles have sustained significant moisture damage from the moss, you'll need to have your entire roof replaced, including the underlayment.

Leads to Wood Rot

In addition to the damage caused to your shingles and underlayment and the mold growth that could occur, moss can also lead to wood rot. The water that's being held inside the spongy moss will soak right through to the plywood subfloor of your roof. If the subfloor stays moist for too long, the wood will begin to rot. If that happens, you'll be looking at a costly replacement that will include the replacement of the plywood subfloor on your roof.

If you've got moss growing on your roof, you need to get that removed as quickly as possible. Contact a roofing contractor near you right away. They can clean your roof and repair any damage that the moss has caused. Click here for more information about roofing services in your area. 


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