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Tips when applying your sauna vapor barrier to your sauna

A sauna vapor barrier is very important and a step that should never be skipped

Installing sauna foil barrier
  • A sauna vapor barrier is very important and a step that should never be skipped and do NOT use a substitute — it could melt at sauna temperatures. The foil will never melt and is odorless.
  • See our installation step: How to Build a Sauna: Foil to Reflect the Heat for installation tips. See our list of sauna foil sizes.
  • It's worth noting that the sauna foil vapor barrier adds a R-1 value to your insulation factor, and acts as a vapor barrier, protecting your wood

The techniques we follow are:

  • Start with the ceiling then the walls.
  • Staple the foil vapor barrier to all interior surfaces; the wall and ceiling, not the floor. Overlap your wall foil over the 3" of the ceiling, helping to keep rising heat near the ceiling.

Sauna Foil Vapor Barrier sizes

A vapor barrier protects your walls from absorbing vapor. Some steam in your sauna is great to help bring on a sweat, but it creates humidity that should not seep into the walls. Venting a sauna into your house is fine.

Select the sauna foil size that fits your sauna.

To best answer, you may want to see: How are home sauna kits built? | Explain Precut vs Prefab.

Also we provide these sauna How-To articles plus a comparison of ALL the most common sauna kit options: