r7-arr

r7-arr t1_jachv1o wrote

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

The sheetrock or plywood should be between your top plate and extend to the sill plate. The seam between the sill plate and the sheetrock or plywood should be caulked with fire blocking caulk. Once you finish your walls and ceiling, you will have created a massive chimney for any fire unless you put up the blocking.

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r7-arr t1_jach3u6 wrote

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

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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