9.25.2.3.Installation of Thermal Insulation

(1) Insulation shall be installed so that there is a reasonably uniform insulating value over the entire face of the insulated area. (2) Insulation shall be applied to the full width and length of the space between furring or framing. (3) Except where the insulation provides the principal resistance to air leakage, thermal insulation shall be installed so that at least one face is in full and continuous contact with an element with low air permeance. (See Note A-9.25.2.3.(3)) (4) Insulation shall be installed over the full height of foundation walls enclosing a basement or heated crawl space. (5) Insulation around concrete slabs-on-ground 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 frost level. (6) Where insulation is exposed to the weather and subject to mechanical damage, it shall be protected with not less than (a) 6 mm preservative-treated plywood, or (b) 12 mm cement parging on wire lath applied to the exposed face and edge. (7) Except as permitted in Sentence (7.1), insulation and vapour barrier located in areas where it may be subject to mechanical damage shall be protected by a covering such as gypsum board, plywood, particleboard, OSB, waferboard or hardboard. (7.1) In unfinished basements, the protection required in Sentence (7) need not be provided for mineral fibre insulation, provided it is covered with a membrane which complies with the requirements of Section 9.25.4. (8) Insulation in factory-built buildings shall be installed so that it will not become dislodged during transportation.