Proper roof ventilation is an integral part of a fully functioning roof system. Allowing your roof and
attic to breath Is beneficial in that it lowers energy costs and increases the longevity of your roofing
system. With correct ventilation you replace damaging warm moist air with fresh cool air keeping the
roof system at recommended temperatures.
It takes more than shingles to protect your home. Without proper ventilation, the shingle can begin to
break down or oxidizing at a faster rate due to higher temperature. High heat can also cause
blistering, cracking, and premature granule loss to any roof; and ventilation prevents this.
When heat is trapped it has to exhaust somewhere, so the hot air travels back down into the home
through the insulation making the building less energy efficient. Proper ventilation not only reduces
heat, it also reduces moisture buildup that can lead to ice damming, roof deterioration, and mold
What does a correct ventilation system consist of?
A roof is properly ventilated when there is a continuous flow of air from an intake (at the eaves of the
roof or soffit area) and that exhausts towards the ridge of the home. Having this continuous flow of
fresh air helps prevent the risk of ice damming in winter months. High heat at the top of the roof
melts snow or ice then refreezes towards the eaves causing an ice dam which then can push water
up into the shingle. In some cases, this can lead to leaks and a risk for rotten wood.
While vented or perforated soffit is the recommended style of intake, a drip edge intake can be
added to the eaves when replacing the roof to provide proper intake without replacing soffit. There
are many types of exhaust vents that work well on any roof. Our favorite is ridge vent due to its low
profile look, high efficiency, and no mechanical parts that can fail later on downs the road. However,
with low ridge length or very low slope roofs, box vents or whirlybird style vents can provide proper
Ventilation is vital to any roof system and roof warranty. Without the recommended ventilation,
warranties can become void due to risk of roof damage from excess heat. Our trained experts at
Chapman Construction can help with any ventilation or roof system questions you may have. With
free, no pressure inspections and estimates we are here to help you protect your home.