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  • Michelle Anderson, Guest Writer

How Does Insufficient Ventilation Cause Your Roof to Rot?

Have you ever wondered how your attic remains dry? Proper roof ventilation is crucial in maintaining a dry attic. Without adequate ventilation, moisture would accumulate, leading to dampness and damage. Proper roof ventilation enables moisture to escape and prevents it from entering the attic, ensuring both the roof decking you see in your attic and the attic itself remain dry.



How does roof ventilation allow moisture to escape but not enter?

An integral component of your overall roofing system is the roof ventilation system. Without it, your roof's functionality is compromised. Typically located at the lowest point under the eaves, the roof's intake vents draw fresh air from the outside and direct it through the attic. At the ceiling's peak, exhaust vents, also known as ridge vents, release hot air, taking advantage of the natural tendency of hot air to rise. This continuous cycle of fresh air entering, and hot air exiting keeps your attic dry and free from moisture, provided the ventilation system is installed correctly.


Without adequate ventilation, your attic becomes a breeding ground for mold and mildew due to trapped moisture and hot air. In cold climates with harsh winters, the lack of proper ventilation can lead to ice-damming. These conditions compromise the structural integrity and safety of your roof, causing overall deterioration.


Who would install a roof without any ventilation in it?

Only individuals who lack the knowledge or concern for proper roofing practices would leave a roof unventilated. Barring it wasn't part of the plan to leave the roof unventilated. That type of roofing practice takes careful consideration and planning.


Some homeowners, in an effort to improve energy efficiency, opt to seal off their attics completely, eliminating ventilation. This decision, typically made in consultation with a contractor, involves careful consideration of the potential advantages and disadvantages. While sealing off an attic can enhance energy efficiency, it may also increase the risk of moisture accumulation, which can lead to structural damage and mold growth.


As always, consult your trusted local roofer with any questions you may have.


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