The definitive word on what kind of glass to use for windows in the sauna (I can really see clearly now)

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I have built a bunch of saunas. I help hundreds build their own sauna thanks to the book I wrote, and an unwavering enthusiasm to help folks build their own kick ass saunas (with no compromises).  The question of what kind of glass to use in a sauna comes up frequently.

So, what kind of glass should I use for windows in the sauna?

Well, I finally got through with an expert in the field.  And it took a lot of work.

Folks in the glass industry seem about as temperamental as the product they sell. Industry experts that I have spoken with are generally not the most patient and don’t seem like a lot of questions from DIY’ers. Most are more accustomed to dealing with tradesmen.  I understand how patience can wear thin as ordering the right custom cut glass can be an involved process.  There are many glass options to choose from, and every order involves a careful verification of dimensions.  Mistakes are costly.

However, I have finally been connected to an expert in the field who was patient and friendly, and locked into my barrage of questions.  Michelle is a glass industry expert with 17 years experience.  Even better is that she told me “I never stop learning” which tells me that she is open minded enough to keep expanding her knowledge in the field.  (This, by the way, is exactly my theory of sauna building, which is why my ebook is open to involving with sauna builders’ generated content).

Ok, enough of all that, here’s the scoop:

For windows in your sauna:

  1. Plan your sauna window carefully.  I am a big fan of transom windows up high. – 16″x 30″ or so.  They don’t get in the way with whatever is underneath, and allow privacy.  There is the candle window, and window in the hot room door.
  2. Contact a local glass company.
  3. Order 1/4″ insulated tempered glass, cut 1/8″ to 1/4″ less than your rough opening.
  4. Frame in the glass using the same material as your hot room (cedar paneling ripped to size).
  5. Run a bead of silicone around the inside and outside of window.

Insulated tempered glass is two pieces of glass bonded together.  This creates an insulated unit.  This system reduces moisture on the glass.  This system helps facilitate the temperature extremes of a sauna hot room and a cold winter’s night.

What if the seal of the double pane glass breaks down and moisture gets between the glass?

This shouldn’t happen, but if it does, we are shit out of luck.  We either have to live with it or replace the glass.

What about cost?

a 16″x30″ insulated tempered 1/4″ piece of glass costs $93.00.  That’s about twice the price of single pane.  But this price is a fraction of the price of buying a window.  We build our saunas one time.  Let’s use the best glass option we can find for our sauna windows.

a hot room transom window as viewed from the outside, with saunatimes promotional material underneath.

For more discussion and clarity on windows in the sauna, please read here.

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