Found 34 results for the keyword ‘Vapour Barrier’

  • WHAT IS A VAPOUR BARRIER?

    For years people have insisted that we have good vapour barriers to protect wall and attics from condensation. But others have railed against vapour barriers, claiming they cause condensation problems inside the house.Now the facts are known -- both groups are wrong and most people confuse v...
  • MYTH: VAPOUR BARRIERS ARE NECESSARY TO PROTECT THE WALLS FROM CONDENSATION.

    False. Vapour barriers do help to protect the walls from moisture accumulation, but the help they provide is almost insignificant compared to that provided by air barriers. Moisture gets into walls and attics by two paths: air exfiltration through cracks and vapour diffusion through the wa...
  • Insulating a Cathedral Ceiling - OVERVIEW

    Hello Jon, I have a cathedral ceiling with a shingled roof. If I insulate the roof air tight, will the shingles lift and curl as they do on poorly ventilated roofs? The other thought is leaving an 1 1/2 inch space between the roof deck and the insulation  and installing a ridge vent, which give...
  • WHERE IS A VAPOUR BARRIER TO BE PLACED?

    Tradition and the building code have always said that a vapour barrier (properly called a vapour retarder) should be placed on the warm side of the insulation. This is actually an oversimplification of the scientific reasoning on the placement of a vapour barrier. With modern, energy-effici...