"Understanding Your Home" by Building Inspector Mark Visser
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TIPS
- Make sure the framed wall stands on the moisture barrier (1), as illustrated in drawing to the right. The top of the barrier, should be no higher than the exterior grade level.
- Moisture barrier can be fastened to the foundation wall or, if the wall is nailed together laying down on the floor, stapled to the back of the wall studs.
- The air-vapour barrier is ALWAYS installed on the "heated side"
- If the poured concrete foundation wall is not straight snap the chalkline 4 1/2" out from the wall.

Batt insulation. Moisture barrier.
Air-vapour barrier.



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Basement Wall Insulation - From Interior Side
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Batt insulation. Moisture barrier. Air-vapour barrier.

THERMAL RESISTANCE OF INSULATION.
The thermal resistance (or RSI) value is a measure of a material's ability to resists heat flow. The higher the R value, the better the material insulates.

WARNING.
All styrofoam (or rigid board) insulation is a fire hazard if not properly protected by non-combustible materials such as drywall.

The basement should not be insulated from the inside if there is a moisture problem, unless corective measures are taken to eliminate the moisture problem. For more information on how to deal with damp or wet basements click here.

A proper and effective way of insulating the basement wall is to install a wood frame or steel stud wall with batt insulation as illustrated.
1- The moisture barrier extends up to the exterior grade level. Leave extra at the bottom to protect the wall from possible water damage (see also TIPS to the left).
2- The batt insulation should fit snugly between the wall studs and joist header area.
3- An air-vapour barrier is installed on the warm, or room, side of the insulation. For more information on how to install an effective vapour barrier click here.




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