The Ontario Building Code | Edge Support
9.29.7.4. Edge support
(1) All hardboard edges shall be supported by furring, blocking or framing where the back-up is not continuous.
9.29.8. insulating Fibreboard Finish
9.29.7.4. Edge support
(1) All hardboard edges shall be supported by furring, blocking or framing where the back-up is not continuous.
9.29.8. insulating Fibreboard Finish
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