Freestanding sauna wall construction / insulation
I'm looking to build a free-standing sauna building in a cold, damp area of the Catskill Mountains in NY State. The heated portion will be a 6' x 8' space, fired by a wood-burning stove. Much of the literature about sauna building on the internet suggests using foil-faced fiberglass batts covered by an air barrier. I have a few questions about this approach:
-Will this be sufficient to prevent moisture infiltration into the wall cavities?
-Can fiberglass withstand temps up to 160F?
-What air barrier can withstand temps up to 160F?
As an alternative one friend suggested using SIPs for the wall panels, but I have similar concern about moisture and heat with that approach.
Any advice is much appreciated.
Asked by Armin Zomorodi
Posted Feb 10, 2013 11:45 PM ET
Edited Feb 11, 2013 10:05 AM ET
Posted Feb 10, 2013 11:45 PM ET
Edited Feb 11, 2013 10:05 AM ET
Technorati
Yahoo
StumbleUpon
Reddit
del.icio.us
Digg
Facebook
GoogleOther Questions in Green building techniques
Most efficient use of 3/4" polyiso on exterior (polyiso is foil faced on both sides)
In Energy efficiency and durability | Asked by Victor Brown | Sep 29, 16
Minisplit Design for Whole House
In Mechanicals | Asked by Jimmy Black | Sep 29, 16
Basement – Best way to eliminate musty smell / mildew/ mold etc
In Green building techniques | Asked by D Moye | Sep 30, 16
Choosing a wall assembly: discussion
In Green building techniques | Asked by Bernard Lam | Sep 27, 16
Heat pumps and traditional heating
In Mechanicals | Asked by Sean Lewkiw | Sep 30, 16
Armin,
1. A free-standing sauna is used for only a few hours a week, so the materials have an ample opportunity to dry between uses.
2. Even if you are a believer in generous uses of löyly (that's the steam created by Finnish maidens splashing water on the rocks placed on the top of the stove), the interior of a sauna will be incredibly dry. Saunas aren't damp. Trust me on this. When you crank up your wood stove until the interior air temperature is 200 degrees F, everything will be bone-dry.
3. Yes, fiberglass (or mineral wool batts) can easily handle sauna temperatures. I'm not sure about SIPs, however. I wouldn't want to have OSB on the interior of my sauna.
4. "What air barrier can withstand temps up to 160F?" Gypsum drywall. I suggest that you install a layer of cedar boards on top of the drywall.
Posted Feb 11, 2013 9:32 AM ET
Thanks Martin! Would you recommend installing a vapor barrier as well? And if so what type could withstand those temperatures?
Posted Feb 11, 2013 10:15 AM ET
Armin,
Don't worry about the vapor barrier. It isn't necessary. Everything will be dry, dry, dry.
Posted Feb 11, 2013 10:42 AM ET