One of the most important components of your roof is the ventilation system. Old homes might not have it or they might have an old system that doesn’t perform well.
You need roof ventilation in your home if there is space between the decking and the ceiling of your dwelling.
Venting your roof is when you have a way for the colder air to enter the attic space from the eaves and exit the attic space at the peak.
There are specific measurements for how much air you can have come into your attic and how much you want to exhaust. This is dependent on the size of your roof.
The International Building Code (IBC) and International Residential Code (IRC) require a minimum ventilation ratio of 1:150 (1 square foot of vent area for each 150 square feet of attic/roof area).
Not every type of ventilation is good for your roof. The best system is eave to ridge venting. Where the air comes in at the eaves and leaves through the ridge.
The reason this is the best is that it makes sure that there is a transfer of air along every square foot of the attic space.
Some ventilation systems cause “dead air” in the corners of your attic, meaning that the air won’t vent well enough.
In these portions of the roof, we find that the shingles and even the plywood will degrade significantly faster
For example, gable vents tend to pull air that is directly in line with the vent but neglects the air that sits in the lower corners along the eaves.
Whatever you do, don’t mix systems. If you have gable vents, you need to close them off before installing the soffit to ridge vent system.
Contact us for a free consultation on your ventilation system.