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I'm thinking of putting either these bitumen shingles, or standard roofing felt, on top of a barrel sauna to stop it leaking.

While I'm at it I thought I might add some air bubble/aluminium insulation roll but I wouldn't want to reduce breathability of the shingles, if they have any in the first place. If they do then I suspect the wood needs it to shed moisture from the sauna steam or it will rot. If they don't then I suspect this isn't a problem as it is a common sauna design.

So does the bitumen felt/shingle layer breathe at all?

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  • Felt paper with a shingles over it is permeable. In other words it will let moisture pass through so it does not allow condensate to build up. So I guess that is kinda breathable.... Careful where you put the roll sheet, it will trap the moisture
    – Jack
    Oct 11, 2019 at 14:27
  • Are we talking about the same thing here though? "shingles" seems to have a variety of meanings; I'm not talking about two separate layers felt+shingles but a single roofing felt layer. (with possibly insulation underneath, or not if it's a bad idea) Oct 12, 2019 at 12:58
  • I see now, the proper question, shingles OR felt, but yes either is breathable.
    – Jack
    Oct 12, 2019 at 15:33
  • I've never seen any bitumen based product claiming to be breathable.
    – handyman
    Oct 15, 2019 at 19:53

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