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Our expertise in ventilation extends the life of your roof

As homeowners strive to make their homes more energy efficient by adding weather stripping, vapour barriers, and energy-efficient windows, they are restricting the natural airflow. New homes are built to exacting energy-efficiency standards that don’t allow houses to “breathe” the way older homes do. Ventilation in the attic is now that much more important – not only to maintain indoor air quality, but to increase the life of your roof. Extra heat can cause ice dams in the winter and shingle deterioration in the summer.

Let Murray Shaw do the math

Our factory-certified installers will measure your attic and calculate the amount of ventilation recommended by the local building codes and the Canadian Asphalt Shingle Manufacturers’ Association (CASMA). Ventilation requirements can range from 1 sq. ft. (0.3 m2) of ventilation for every 300 sq. ft. (91.4 m2 ) up to 1 sq. ft of ventilation for every 150 sq. ft. (45.7 m2), depending on the slope of the roof and the type of the roof. Plus the exhaust vents on the roof must be balanced with the intake vents in the soffits to ensure even airflow throughout the attic.

Depending on the type and slope of your roof, we will recommend the type of vents best suited to your roof

  • Ridge vents
  • Power vents
  • Static vents

Location & Office Hours

H-3537 White Oak Rd.
London, ON N6E 3A1

Telephone: 519.473.7500
Fax: 519.473.2337
Toll Free: 1.800.876.7520


Monday to Friday 8:30 am to 5:00 pm
(Other times by appointment)