The attic, a complex separation

The roof, also known as the attic, attic or even under roof, is the space that separates the ceiling of a house and its roof. Nevertheless, this space, which is sometimes neglected, must be the object of great attention: insulation and ventilation are paramount. We prepare and repair your roof so that it offers you optimal comfort despite the clean temperatures on the north shore or the south shore of Montreal. This obligation of a maintained and healthy roof is also present in the National Building Code.

In fact, the National Building Code of Canada (section 9.19) requires adequate ventilation of the roof of your house, which is the condition required by shingle and insulation manufacturers to ensure their installation.
Improve the longevity of your roof and save on energy thanks to the insulation and ventilation of your roof. Problems resulting from poor ventilation and insulation of the roof


  • Frost problem in the roof
  • Ice Bench Problem
  • Water infiltration problem
  • Moisture problem
  • Mold problem
  • Peeling paint problem
  • Problem of premature wear of roofing shingles


Attic : problematics

The ventilation and insulation of the roof are linked. Moisture-absorbing wool loses up to 50% of its insulating capacity: this is a typical problem of poor ventilation.

Poor ventilation will cause condensation as a result of the difference in temperature between the interior and exterior of the house and the presence of moisture from inside the house. With the cold, the condensation will then form frost. When temperatures become milder, the frost melts and increases the presence of moisture in the roof. It is this moisture that will be responsible for molds, water infiltrations or premature deterioration of the shingles.


To ensure good ventilation, we use perforated soffits on the lower part of the roof. These are small aluminum grids with small holes that will allow the air to infiltrate. For the air to come out, we install a fan in the upper part. This ventilator will thus evacuate the cold air which will itself take with it the warm air of the house and the humidity. Without hot air and without moisture, the condensation can no longer take place. It is important to check that these air inlets and outlets are not obstructed in the ventilation process, particularly by insulation (eg mineral wool).

Our experts are able to give you an accurate diagnosis on your installation and your needs. Ask us for a quote, we will be happy to help you.