Standard Bark Brown 3-Tab Shingles
Proper ventilation keeps your attic as close to the outside temperature as possible year-round, which is what you want. Too little ventilation means excessive heat in the summer months, and the potential for condensation and ice dams in the winter months since the warm moisture laden air that escapes into the attic from heating the home lingers instead of evacuating out.
Speaking of warm air escaping into the attic during the winter months, you should also make sure you minimize this by having the proper amount of insulation in your attic cavity and also making sure that it’s sealed off well at penetrations through your vapour barrier.
Poor ventilation and insulation can lead to a host of detrimental issues over time. Some of these are excess moisture, mold, deterioration, and of course, increased home energy costs.
Pro Tip: NEVER mix different types of roof ventilation in the same attic cavity. They should all be the same type, drawing equally from the intake air at the bottom.
A mistake commonly seen is to add turbines in with regular roof vents, but this creates the likely potential that the turbine will draw air in through a regular vent near it, as opposed to drawing in from the intake air source at the bottom which is what should happen.
A professional roofing contractor will be able to design a roof ventilation system suited to your particular home and also rectify, or at least advise on your intake air
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