bathroom ceiling question/pvc paneling

[flyguy]

We have a condo in a 1947 building that doesn't have a bathroom vent fan. As a consequence, the paint on the ceiling is bubbling and the underlying plaster is loosening from excessive humidity.

I'd like to find a permanent solution and, when I have travelled abroad, I have seen bathroom ceilings covered in moisture-proof panels like these:

Spabord shower wall panels
They are made of UPVC and interlock to provide protection. I can't seem to find a distributor here in the U.S.

Does anyone know of a place here where something like this is available?

Short of that, is there a good domestic solution to this problem?

Thanks,

Mitch

[HayZee518]

vapor barrier towards the living space. good ventilation via a window. dur-rock or waterproof sheetrock.