ProSaunas Sauna Foil Radiant and Vapor Barrier, 48 in x 80 ft roll

1. Materials 45% of the rating 4 of 5

   Solid aluminum foil on a kraft backing with no plastic film or bubble core, per the seller, which is what the category asks for; the adhesive and backing are not analyzed.

2. Durability 20% of the rating 3 of 5

   Sauna Marketplace rates it from -40 °F to 400 °F with continuous service above 230 °F and Haven of Heat says it resists deterioration over 200 °F; there is no test report, and the only warranty mention is a “2 Year Warranty” tag on Haven of Heat’s listing, which we could not tie to ProSaunas’ workmanship warranty.

3. Safety 10% of the rating 3 of 5

   The kraft backing is paper and neither page gives a flame-spread or smoke rating; Sauna Marketplace does say to keep an air gap and to seal electrical boxes.

4. Trust 10% of the rating 3 of 5

   The Sauna Marketplace page says one roll covers both 320 sq ft and 1,300 sq ft and gives its perm and emissivity figures without a test report, and the two stores quote different heat limits, though no recall was found.

5. Value 15% of the rating 4 of 5

   About $0.29 per square foot at Sauna Marketplace before $69.96 shipping (free over $200) and $0.47 at Haven of Heat, with seam tape extra.

The rating, 3.6 of 5, is the weighted average of these scores. See how we rank building a sauna and our standard.

• Sauna Marketplace (opens in a new tab) approx. $92.90 per roll, plus $69.96 shipping (free with a sauna or heater order, or on orders of $200 or more). Item 128938. Its feature table says 1,300 sq ft but the roll is 320 sq ft. Seam tape is extra (ProSaunas foil tape, 2 in x 164 ft, $32.86).
• Haven of Heat (opens in a new tab) approx. $149.99 per roll (320 sq ft). Same item number (128938), described as aluminum-faced kraft paper. Its web address says 1300 sq ft but the title says 320. Ships in 5 to 7 days; we did not check its shipping cost.

Prices as we saw them on October 23, 2026. They change often. These links carry no tracking code and earn us nothing.

1. Pure aluminum foil, 0.003 in thick, on a kraft paper backing (Sauna Marketplace: no laminated plastic films and no bubble core; Haven of Heat: aluminum-faced kraft paper)
2. Seams are taped with 2 in foil tape, sold separately (ProSaunas foil tape, 2 in x 164 ft, $32.86 at Sauna Marketplace)
3. The adhesive on the tape and the composition of the backing are not stated

Is there a fire rating, and is the kraft backing a fire risk?

Sauna Marketplace gives a temperature range of -40 to 400 °F but no flame-spread or smoke-developed index, Haven of Heat gives none either, and the backing is kraft paper. Ask the seller for the rating before you buy, and keep the barrier behind the cladding and outside the heater’s clearances.

Do the coverage numbers add up?

The Sauna Marketplace title says 48 in x 80 ft (320 sq ft), which is correct, but its feature table says “1,300 sq ft coverage”, and Haven of Heat’s web address says 1300 sq ft while its title says 320. A 320 sq ft roll covers a 6 x 8 ft sauna with walls and ceiling only with little to spare, so buy by the area of your own room.

Are the vapor and heat claims tested?

Sauna Marketplace says it is a Class I vapor retarder (0.1 perm or less) with 97% emissivity and a rating of 400 °F (continuous service above 230 °F), and links no test report; Haven of Heat says it resists deterioration at temperatures over 200 °F. The claims are plausible for aluminum foil but are the sellers’ own.

Does it need an air gap?

Yes. Sauna Marketplace says the foil needs a 3/4 in air gap, from furring strips or foil-faced rigid insulation, to work as a radiant barrier, and that electrical boxes should sit outside the foil or be vapor-sealed. Its sample wall also lists foil-faced polyiso as an option, which is a foam we would avoid on the hot side.

• Solid aluminum, 0.003 in thick, on kraft paper, with no laminated plastic or bubble core, which is what the category asks for.
• Sauna Marketplace states a temperature range (-40 to 400 °F) and a vapor rating (0.1 perm or less) and explains the air gap and seam taping.
• About $0.29 per square foot at the cheaper store, among the lowest prices for a sauna barrier.

• No fire rating and no test report on the roll’s pages; the only warranty mention is a “2 Year Warranty” tag on one store’s listing.
• The coverage figures disagree (320 sq ft in the title, 1,300 sq ft in the table), and the stores quote different heat limits.
• Seam tape is sold separately, and shipping is about $70 at the cheaper store unless you add it to a sauna or heater order or spend $200.
• The seller’s own sample wall lists foil-faced polyiso foam as an option.

1. Sauna Marketplace: ProSaunas sauna foil radiant barrier, 48 in x 80 ft roll. Independent source. Materials, ratings, price, shipping and installation advice, seen 2026-10-23. ProSaunas’ own site does not list this item. Open ↗ (opens in a new tab)
2. Haven of Heat: ProSaunas vapor barrier foil, 4 x 80 ft roll. Independent source. Store price, “aluminum faced kraft paper”, heat limit over 200 °F, seen 2026-10-23. Open ↗ (opens in a new tab)
3. Finnish Sauna Builders: foil faced vapor barrier, 4 ft x 125 ft. Independent source. Compared; its page names no fire or vapor rating. Open ↗ (opens in a new tab)
4. US Consumer Product Safety Commission: recall search. Certifier or regulator listing. Returns no recall for ProSaunas (2026-10-23); searches for Haven of Heat and Sauna Marketplace also returned none. Open ↗ (opens in a new tab)
5. California Attorney General: Proposition 65 60-day notice search for ProSaunas. Certifier or regulator listing. No matching records (2026-10-23). Open ↗ (opens in a new tab)

• Finnish Sauna Builders foil-faced vapor barrier (opens in a new tab) A 4 x 125 ft roll (500 sq ft) for $210, about $0.42 per square foot. Its page names a foil face and an impregnated fiberglass mesh but no fire or vapor rating.
• ROCKWOOL Comfortbatt stone wool insulation Non-combustible, with published flame-spread and smoke ratings of 0, for the wall cavity behind the barrier.

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