| 9.25.2. |
Thermal Insulation |
| 9.25.2.1. |
Required Insulation
- All walls, ceilings and floors separating heated space from unheated space, the exterior air or the exterior soil shall be provided with sufficient thermal insulation to prevent moisture condensation on their room side during the winter and to ensure comfortable conditions for the occupants. (See Note A-9.1.1.1.(1).)
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| 9.25.2.2. |
Insulation Materials
- Except as required in Sentence (2), thermal insulation shall conform to the requirements of
- ASTM C 726, "Mineral Wool Roof Insulation Board,"
- CAN/CGSB-51.25-M, "Thermal Insulation, Phenolic, Faced,"
- CGSB 51-GP-27M, "Thermal Insulation, Polystyrene, Loose Fill,"
- CAN/ULC-S701.1, "Thermal Insulation, Polystyrene Boards,"
- CAN/ULC-S702, "Mineral Fibre Thermal Insulation for Buildings,"
- CAN/ULC-S703, "Cellulose Fibre Insulation for Buildings,"
- CAN/ULC-S704, "Thermal Insulation, Polyurethane and Polyisocyanurate, Boards, Faced,"
- CAN/ULC-S705.1, "Thermal Insulation - Spray Applied Rigid Polyurethane Foam, Medium Density - Material Specification," or
- CAN/ULC-S706.1, "Wood Fibre Insulating Boards for Buildings."
- The flame-spread ratings requirements contained in the standards listed in Sentence (1) shall not apply. (See Note A-9.25.2.2.(2).)
- Insulation in contact with the ground shall be inert to the action of soil and water and shall be such that its insulative properties are not significantly reduced by moisture.
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| 9.25.2.3. |
Installation of Thermal Insulation
- Insulation shall be installed so that there is a reasonably uniform insulating value over the entire face of the insulated area.
- Insulation shall be applied to the full width and length of the space between furring or framing.
- 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).)
- Insulation on the interior of foundation walls enclosing a crawl space shall be applied so that there is not less than 50 mm clearance above the crawl space floor, if the insulation is of a type that may be damaged by water.
- 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.
- 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 edge.
- Insulation 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.
- Insulation in factory-built buildings shall be installed so that it will not become dislodged during transportation.
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| 9.25.2.4. |
Installation of Loose-Fill Insulation
- Except as provided in Sentences (2) to (6), loose-fill insulation shall be used on horizontal surfaces only.
- Where loose-fill insulation is installed in an unconfined sloped space, such as an attic space over a sloped ceiling, the supporting slope shall not be more than
- 4.5 in 12 for mineral fibre or cellulose fibre insulation, and
- 2.5 in 12 for other types of insulation.
- Loose-fill insulation is permitted to be used in wood-frame walls of existing buildings. (See Note A-9.25.2.4.(3).)
- Where blown-in insulation is installed in above-ground or below-ground wood-frame walls of new buildings,
- the density of the installed insulation shall be sufficient to preclude settlement,
- the insulation shall be installed behind a membrane that will permit visual inspection prior to the installation of the interior finish,
- the insulation shall be installed in a manner that will not interfere with the installation of the interior finish, and
- no water shall be added to the insulation, unless it can be shown that the added water will not adversely affect other materials in the assembly.
- Water repellent loose-fill insulation is permitted to be used between the outer and inner wythes of masonry cavity walls. (See Note A-9.25.2.4.(5).)
- Where soffit venting is used, measures shall be taken
- to prevent loose-fill insulation from blocking the soffit vents and to maintain an open path for circulation of air from the vents into the attic or roof space, and
- to minimize airflow into the insulation near the soffit vents to maintain the thermal performance of the material. (See Article 9.19.1.3.)
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| 9.25.2.5. |
Installation of Spray-Applied Polyurethane
- Spray-applied polyurethane insulation shall be installed in accordance with CAN/ULC-S705.2, "Thermal Insulation - Spray Applied Rigid Polyurethane Foam, Medium Density - Application."
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