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MinkOWar t1_jabi4nw wrote

Reply to comment by r7-arr in Add additional insulation to walkout basement wall cavity. Good idea? Bad idea? by hoppyending

Canada doesn't use the IRC.

Also, fireblocking materials in that reference include glass fiber batts... so OP's literally proposing to fill the wall with approved fireblocking by that reference.

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r7-arr t1_jach3u6 wrote

I guess fire is different in Canada. There should be a solid block of plywood or 5/8 drywall at the top of the cavity that he has created to create a block between that and the joist bays. The reason is that any fire that starts in that wall space will rapidly spread into the basement ceiling. Fiberglass batts are not fire blocking. Mineral wool batts are acceptable.

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