Proper ventilation helps to remove hot air and moisture from your attic, reducing in turn the energy used to run your air conditioner and the risk of mold.
At Belgrave Roofing, we can help improve your home or business’s roof ventilation system in Montreal. We can suggest and supply the best system and vent configuration to improve your roof’s ventilation.
Trapped heat and moisture can raise energy costs, cause ice dams, and damage roof system components as well as structural and personal items located inside the attic where temperatures can easily reach 65°C. Condensation that forms inside attics can be caused by the use of washing machines, dishwashers, bath tubs, showers, and tumble dryers unless these items are properly ventilated through the roof. In some cases, the condensation can be bad enough to be mistaken for a roof leak.
There are many types of attic vents available today. There are static vents, power vents, ridge vents, turbine vents, soffit/cornice vents and gable vents. These all come in a wide variety of sizes, styles and shapes. Some will ventilate better than others depending on the roof configuration, attic size, climate, etc. Each roof will be verified prior to offering ventilation repairs or corrections.
To properly ventilate an attic, two types of vents are needed. Intake vents, which are located at the downslope edge of the roof (a.k.a. eaves) and allow fresh air into the attic; and exhaust vents, which are located near or on the ridge line of the roof and allow air to leave the attic. The use of an exhaust vent in conjunction with an intake vent uses the natural forces of wind pressure and thermal effect, collectively known as the Stack Effect, to ventilate the attic space. HINT: Make sure your attic insulation doesn't block the intake vents. If necessary, use baffles to keep the insulation back from it.
When visually inspecting a roof and/or providing estimates, we can only see so much. During warmer months, condensation problems may not be evident on the exterior or interior of the roof structure. It is important to let your roofing specialist know about any reoccurring condensation problems. It must be remembered that a roof membrane itself is not the cause of condensation. The roof is the envelope being affected and not the origin of the problem.
Here are some problems associated with ventilation in Montreal (in homes and businesses)