Found 34 results for the keyword ‘Vapour Barrier’

  • Basement walls -- Moisture & Vapour Barriers

    Do I need to place a vapour barrier against the brick wall, then insulation and then another vapour barrier over that?  The wall does not leak and is fully underground.  Barbara THE VAPOUR BARRIER The vapour barrier is more properly called a vapour retarder. It is designed to stop moisture in t...
  • Insulating an old house and more.

    I don't often answer all the details of a long letter, especially not with the time constraints that we have on television. But Larry from Sydney Mines, Nova Scotia wrote such a coherent detailed letter about the 80 years old very cold home that he just bought that I thought I would just wade in...
  • Insulating a foundation with embedded floor joists

      Certain parts of Canada, particularly in the Winnipeg region, have a traditional construction technique that presents serious challenges when you want to insulate a basement -- the ends of the joists are actually embedded in the concrete foundation wall.  Chris, from Winnipeg, asked for some f...
  • Air tight electrical boxes

    Vapour Barriers should go on the "Warm in Winter" side of the insulation so that they can stop all the moisture in the air from going through the wall, but stop it where it is still warm and there will be no condensation. The problem is that a lot of air, and a lot of moisture can go through ele...
  • DOES STYROFOAM ON THE OUTSIDE OF THE HOUSE FORM A VAPOUR BARRIER?

    Styrofoam (which is actually a Dow Chemical brand name of extruded polystyrene) is a fairly good vapour barrier. It will not cause problems in the Canadian climate if you put on at least 1-1/2 inch thick and preferably in 2 ft. x 8 ft sheets applied horizontally. This actually permits some ...
  • Where to put the vapour barrier in a special renovation.

    Michael from Edmonton added a second story to his house and has a question about the vapour barrier in one particular place. But first of all you have to see the video he sent us showing how he built and installed the roof! It was built, and even shingled, on the ground and then he used a crane...
  • Wet insulation in the basement.

    Joan insulated her basement using dense insulation made for steel doors, then discovered moisture behind the vapour barrier and is worrying if it is the insulation that is causing the problem.No Joan, there can be lots of reasons for moisture in a basement wall, and even the researchers are tr...
  • How do you insulate a basement wall that has a pony wall?

    Ron from Penticton, B.C. has a "stepped" foundation with a pony wall from the concrete to the ceiling above. This upper portion is insulated but not the concrete. He wants to insulate it all. He asks: "Does he have to remove the existing drywall, and does the vapour barrier need to extend over th...
  • What is an air tight electrical box?

    We all know that electrical boxes are the often the source of cold air drafts. They are equally the route by which warm moist air escapes from our houses. In fact, the National Research Council of Canada has calculated that up to 30 litres of water can pass through a single electrical box in one ...
  • Air Spaces in Walls -- Myth and Science -- Overview

      Walls often have air spaces hidden somewhere between the siding on the outside and the drywall on the inside.  Some are accidental -- some on purpose, even code required -- some served a purpose at one time in history but because of the evolution of construction, are no longer useful -- some a...