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Roof Ventilation

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Edmonton Roof Ventilation

 

Ventilation is a system of intake and exhaust that creates a flow of air. Sound roofing ventilation keeps attic airflow all year round, creating cooler attics in the summer and drier attics in the winter. 


Condensation and Ice dams

In the winter, warm and moist air rises through the ceiling into the attic and condenses on cold surfaces. (rafters and roofing deck) This water causes several problems for the Edmonton homeowners. The most common one is "attic rains" - condensation (water) dripping onto insulations and sometimes seeping through ceilings. 

Pic: condensation around the bathroom vent duct.

Ice dams also happen in the winter months when the snow melting/freezing cycle occurs at the eaves and gutters. This cycle can result in a pool of water and ice backing up under the shingles and behind the fascia boards. 

Pic: ice dams

Having sufficient insulation (a rule of thumb is having at least 10 to 12 inches of insulation) and ventilation will dilute and remove warm, moist air from the attic space, reducing the risk of ice dam formation and attic condensation. 

Roof ventilation types

Duraflo offers a selection of high-quality roofing vents for the Edmonton homeowners. 

Standard Roof Vent (Box Vent or Roof Louvers) is installed close to the roof ridge to ventilate warm air out from the attic space. 

WeatherPro Turbo Roof Vent (Tall Vent) has a much larger 117 sq. in. of net free area and stands tall on the roof. One Pro Turbo = 3 Box Vents. 

Ridge Venting allows smooth airflow over the ridgeline, maximizing effective ventilation from the attic space. They feature 18.3 sq. in. per linear foot of net free area.

WeatherPro Slantback is often used as intake vents when soffit ventilation is blocked or nonexistent. Soffit ventilation is located on the underside of the eave.

type of vents Edmonton roofing repair services

Safe Roofing also carries premium grade metal vents by Ventilation Maximum

Shingle Warranties

Shingle manufacturers require that the ventilation system meet local building codes. If not, the shingle warranty terms may be void.

Learn more here or contact us directly for answers! 

 

Common ventilation questions

1. Is ridge vent the best vent? 

No, it is not. Ridge vents (like other roof vents) will work effectively only when a proper intake venting system is in place. Focus on installing a balanced ventilation system first. 

2. Most roof vents don't have turning parts. How do they work? 

A wind-driven flow of air (wind's speed) creates areas of high and low air pressure. High pressure forces air into the attic, while low pressure draws air out. High profile non-powered ventilation designs usually do not require a lot of wind speed. The lower the wind speed requirement, the higher the proficiency of the vent. 

3. Are intake vents more important? 

For maximum efficiency, the net free area ("NFA") of the intake vents should be equal or greater than the NFA of exhaust vents.

4. How should I vent vaulted ceilings? 

We recommend using a ridge venting system with an air space of at least 1" between the roof sheathing and insulation. Before installing a ridge venting system, a proper intake venting system must be in place. Without a balanced system, moist air can be pulled from the living space, saturates in the narrow attic space, which will promote mold growth and increase the risk of condensation. 

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