| 9.27.9. |
Hardboard |
| 9.27.9.1. |
Material Standards
- Factory-finished hardboard cladding shall conform to CAN/CGSB-11.5-M, "Hardboard, Precoated, Factory Finished, for Exterior Cladding."
- Hardboard cladding that is not factory finished shall conform to Types 1, 2 or 5 in CAN/CGSB-11.3-M, "Hardboard."
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| 9.27.9.2. |
Thickness
- Type 1 or 2 hardboard cladding shall be not less than
- 6 mm thick when applied over sheathing that provides continuous support, and
- 7.5 mm thick when applied over furring or framing members not more than 400 mm o.c.
- Type 5 hardboard cladding shall be not less than 9 mm thick when applied over sheathing that provides continuous support or over furring or framing members spaced not more than 400 mm o.c.
- Where hardboard cladding is grooved, the grooves shall not extend more than 1.5 mm into the minimum required thickness. (See Note A-9.27.9.2.(3).)
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| 9.27.9.3. |
Panel Cladding
- Hardboard cladding applied in panels shall have all edges supported with not less than a 5 mm gap provided between sheets.
- Vertical joints in cladding described in Sentence (1) shall be protected with batten strips or sealant when the joints are not matched.
- Horizontal joints in cladding described in Sentence (1) shall be lapped not less than 25 mm or shall be suitably flashed.
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| 9.27.9.4. |
Lapped Strip Siding
- Hardboard applied in horizontal lapped strips shall have not less than a 5 mm gap provided at the butted ends, which shall be sealed or otherwise protected with suitable mouldings.
- The horizontal joints of siding described in Sentence (1) shall overlap not less than 1 mm per 16 mm width of siding board but not less than 9.5 mm for matched joint siding or 25 mm for lapped siding.
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| 9.27.9.5. |
Clearance
- Not less than 3 mm clearance shall be provided between hardboard cladding and door or window frames.
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