It used to be used that way. Nowadays it appears on products that can not be considered breathable to enough extent to warrant the description, making such product description claims meaningless.
NT
Drivel. Eg You can get roofing (under slate/tile) felt.
Needs no ventilation as it is permeable to water vapour but not actual water liquid. (Which just runs off)
Saves a lot of work/expense.
not really
talk about missing the point.
A hi tec fabric is a different matter to something you can tosh on to masonry of varying porosity, where the formation of a uniform film is far from guaranteed. Perhaps we could clad our buildings in Gore-Tex!
And this is interesting
The only antidote to Climate Change????
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