How Moisture Can Damage Your Roof

After your new roofing installation, it’s best to discuss regular maintenance with your contractor. While it’s true that your roof is new now and — barring a storm — it’s highly unlikely that it will have issues in the near future (provided it was installed by a professional), it’s not going to stay new forever. It’s exposed all the time to the elements, which can wear it down over time.

Moisture Can Damage Your Roof

One of the most damaging elements for any type of roof is moisture. Moisture can be present in three forms: solid, as in ice and snow; liquid, as in rain; and gas, as in moisture vapor, which are microscopic droplets of water suspended in the air.

But how does moisture cause damage?


Moisture is responsible for the decay of different roofing components. Drywall is susceptible to moisture damage, which weakens it. As moisture saturates drywall, the latter may begin to sag, which is not only unsightly but also dangerous.

Wood Rot

Wood is affected by long exposure to moisture, as well. Wood decay is commonly referred to as wood rot, and it happens if the moisture levels in your roof reach 20% and up. This is also a hazard, as decayed wood is not strong enough to remain stable.


As for metal components, moisture can cause corrosion. When components of a roof are affected by corrosion, it won’t be long before they have to be replaced. This is why good metal roofing products are treated to resist corrosion.

Mold and Mildew Growth

Mold and mildew thrive in moisture-rich environments. You might not even know it, but your attic could already be a cesspool. You’ll know that mold and mildew are present when you smell them as soon as you go up to your attic. They cause aesthetic damage, invite insects, and put your family in danger of inhaling the spores that trigger allergic reactions.


You might think it’s limited to your roof or the parts of your house holding up the roof, but moisture can also affect the level of comfort in your home. If your attic is always highly humid, the problem can start affecting your interior rooms.

But how can you tell if your roof has moisture-related problems? Here are some signs to watch out for:

  • Musty odor released by bacteria, mold and mildew.

  • Dark patches on walls, ceilings, and other surfaces.

  • Ants, rodents, termites, cockroaches and other pests seem to be multiplying.

If you need to address moisture problems with your roof, or simply want a residential roof installation to replace an aging roof, get in touch with State Roofing. Call us today at (360) 794-7164 or tell us about your project here. We’re ready to help you in Seattle, WA.

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