This is a 4 ft by 80 ft roll of aluminum-faced kraft paper vapor barrier, 320 square feet, made for stapling over sauna wall studs with the foil side facing the room. It blocks moisture from reaching wall insulation and reflects heat back inside, adding about 1R of insulation value. It holds up above 200°F, which is what separates it from ordinary poly vapor barriers that soften at sauna temperatures. It suits anyone building or re-lining a sauna wall; the main trade-off is that seams need foil tape and careful overlap to stay airtight.
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Rated 4.6 out of 5 across 50 ratings, buyers mostly report it does the job for sauna walls and installs easily. Complaints center on seam taping and careful handling of the foil.
This vapor barrier foil is made for sauna walls. It is aluminum-faced kraft paper that keeps heat and moisture inside the sauna and out of the wall insulation, where moisture can lead to mold.
The foil reflects heat back into the sauna and adds 1 R of insulation. It resists deterioration at temperatures over 200°F.
To install, staple it to the wall studs with the reflective side facing the interior. Overlap seams by 2 to 3 inches. High-temperature aluminum foil tape is recommended for the seams.
