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Return AIr floor joist insulation

My return air is routed through boxed in floor joists. Thee are gaps in the joints that sock in air from the crawl space. What is the best way to insulate. them.

Re: Return AIr floor joist insulation

Narrow gaps could be caulked. Wider gaps (not over 3/8") can be filled with foam or expanding foam. Gaps over 3/8" will require a repair.

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