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I'm insulating using rockwool between two floors and wondering which foil shall I use on the small section that faces the outer wall?

Its a old poorly insulated house from 1930 with brick walls. Also, how can I attach the vapor barrier? Most recommend using staples or tape, but its really hard to access the small space. enter image description here

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  • Maybe it's because I'm not an insulation expert, but what is the "foil" for? Is it to be a vapor barrier? Something else?
    – FreeMan
    Sep 27, 2021 at 14:03
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    @FreeMan, indeed vapor barrier, much better to use that instead of the word foil.
    – MLEN
    Sep 27, 2021 at 14:38

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