- Insulation needs to be installed so there is a reasonable uniformity of insulating value over the entire face of the insulated area. (Don't leave some areas less insulated than others)
- Insulation shall be applied to the full width and length of the space between furring or framing.
- Unless the insulation is intended to also be the primary air barrier, the insulation needs to have one entire face in contact with an air barrier.
- Crawlspace foundation walls require full insulation except for the bottom 50 mm if the insulation is of a type that can be damaged by water.
- Insulation around concrete slabs-on-grade shall be located so that heat from the building is not restricted from reaching the ground beneath the perimeter, where exterior walls are not supported by footings extending below the frost line.
- Where insulation is exposed to the weather and subject to mechanical damage, it shall be protected with not less than 6 mm preservative-treated plywood, or 12 mm cement parging on wire lath applied to the exposed face and edges.
- Insulation located in areas where it may be subjected to mechanical damage needs to be protected with gypsum board, plywood, particleboard, OSB, waferboard or hardboard.
- Insulation installed in factory-built buildings shall be installed so that it won't fall apart during transportation.