Ventilation: Getting the Balance Right Starts at the Top
Whether a contractor is repairing or completely replacing a roof, a home’s ventilation should always be considered. Attic or roof ventilation has been a part of the building code since at least the 1940s but remains poorly understood, and many attics are still incorrectly ventilated. Every attic ventilation system should have a balance of intake and exhaust.
Signs of poor ventilation may manifest as blisters, bumps and mole runs. Beyond detracting from the roof’s appearance, these problems may also compromise the roof’s performance and longevity. The Asphalt Roofing Manufacturers Association (ARMA) reports that an overheated attic, combined with excessive moisture, can cause a range of problems, including damage to roof decking and roofing shingles, which can become distorted and deteriorate prematurely.