Breathable membranes are often made from many layers of aluminum mesh
that has been bonded together. This mesh is very fine and yet porous.
This allows vapors to escape and yet prevents water from coming in.
Imagine a sieve that only works in one direction. During home building
this material is used on floors, roofs and walls underneath the finish
although there are some that are actually designed to be the finish.
Info from breathermembrane
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