Dangers of Roof Moisture

Nov 2, 2018 | Roofing

Dangers of Roof Moisture

A buildings rooftop is designed to protect its interior structures from moisture damage, but rain and snow will eventually degrade roofing materials. If moisture leaks on underlying roofing materials, then damage begins to the building gradually in several ways.

Mold Growth and Mildew Odor

When the shingles on a rooftop develop mold growth, property owners will begin to notice a foul mildew odor. Mold is a living organism that will invade underlying materials such as wood and drywall, and the people who are inside the building can experience allergic reactions from the contamination. The symptoms caused by mold allergies include respiratory distress, itchy skin, and watery eyes.

Rafters and Joists


If moisture reaches a rooftop’s rafters and joints, then the materials will begin to swell and crack during the cold winter months. By the time spring arrives, a buildings roof may have separated from the underlying frame. When materials have separated on a roof, rain and snow will enter the building, causing damage to internal materials such as drywall and wooden frames.

Softening and Weakening Roofing Materials

When roofing materials absorb moisture, the items begin to soften and weaken, making it easier for damage to occur from high winds. Dry roofing materials are less likely to blow away in a strong thunderstorm.

Structural Problems

If rainwater and snow melt continue to leak into a buildings roof, then water enters attics and wall spaces, leading to minor or major structural problems to a building. Instead of needing to spend a few hundred dollars on a simple shingles replacement, a property owner may need to spend thousands of dollars to replace an entire rooftop.

Infestations of Insects and Animals


Animals, birds, and insects are attracted to moist environments, and a wet rooftop with small holes is easy for termites, pigeons, and rats to enter. In addition to having significant damage to a building from moisture, there is a good possibility that the invasions of vermin can destroy the structure.

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