Often, homeowners or condo owners complain that the floor at the perimeter is very cold during the winter. And there is condensation or frost on the windows and their energy bill is too high. All these symptoms reveal the presence of an air infiltration problem.

Inside the building, this problem disturbs the comfort of the occupants by causing condensation, the formation of frost and mold in the envelope.

Building envelope

The building envelope consists of a membrane that prevents air from entering inwards, this is the air barrier. The latter is not the only element that prevents air infiltration to the interior. In fact, airtightness requires a cumulative process, that is the proper execution of the entire building envelope construction work that is required to ensure satisfactory performance of the entire building envelope. . The fact of achieving an optimal degree of airtightness of the envelope protects it from condensation and deterioration of the structure, which contributes to theenergetic efficiency and the comfort of the occupants inside.

Infiltrometry and smoke pear

An airtightness test (infiltrometry) must be carried out by means of a device called an "infiltrometer" to detect the points of infiltration of air through the envelope of the building

The principle ofblower is to create a negative pressure in the building using a big fan. By creating this negative pressure, the outside air must enter inward to equalize the inner and outer pressure. It is through cracks and poorly sealed joints in the building envelope that air will enter the interior. That's when the engineer with a smoke pear and a thermal camera can detect air infiltration points in the building envelope.

In main pieces occupied, it is necessary to check:

  • Windows, making sure the windows, frame and frame are watertight.
  • The doors, not forgetting the threshold and the perimeter of the frame.
  • Outlets, including those on interior walls.
  • Fans and evacuation vents should vent to the outside and close properly when not in use.
  • The corners where two walls meet imperfectly.
  • Ceiling lights.
  • Moldings and baseboards.
  • Cracks in the cladding of walls or ceilings.
  • The meeting point of wood frame walls and masonry walls or chimney.
  • Doors or hatches access to the attic.
  • The registers and the bricks of the hearths.
  • Behind the baths and under the sinks.
  • Above the sliding doors (between two walls).
  • Around the pipes and ducts.

In Lthe attic, it must be checked :

  • Around the plumbing column and other pipes at floor level.
  • Wires or fixtures that cross the floor.
  • Air ducts coming from below.
  • At the meeting point between the ceiling and the partitions.
  • Access hatches at the attic.
  • Around the fireplace.
  • Along the adjoining walls.
  • Along the ceiling above the bathrooms and stairwells.

Au subsoil, it must be checked :

  • The openings through which electrical wires, gas pipes or oil supply pipes pass.
  • The meeting point of a wood frame wall (low slab) and foundations (concrete or stone).
  • The holes through which the wires or the pipes enter inside the outer walls.
  • Joints in air ducts, hot air dampers and cold air intakes.
  • Around the frame of the doors and windows.
  • Cracks in foundation walls and cement slabs.
  • Drains in the floor.

Our recognized engineers can according to the mandate:

  • Perform an on-site expertise to perform the blower door test.
  • Analyze the data and provide a verbal professional opinion.
  • Write an expert report with photos, findings and recommendations.
Air tightness test

Air tightness test

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