Hello, I have tried to find information about the above but can't find anything relevant.
How should one hang paintings and curtain rods on exterior walls without puncturing the moisture barrier? I mean classic Molly plugs will likely make quite large holes in the plastic.

Best regards, realdoolar
 
It depends on what kind of exterior wall you have:
Single drywall? Depends on the weight, a "normal" painting doesn't need a molly, but there are all sizes and weights of paintings. A small painting can be hung with a hook and drywall screw.
Plasterboard and wood fiberboard? wood screw
Just particle board? - wood screw
 
It's insulation->plastic->single drywall.

No, actually the biggest problem is probably not the paintings but the curtain rods. I have a two-year-old little Tarzan at home so drywall screws feel a bit weak ;-)

I also need to put up a bedside lamp that I want to have a sturdy mounting for.
 
Well, then you don't have much to choose from.

If you use a "molly," its wings will go out behind the plastic and clamp down, and then when you attach the fitting and screw, it will be almost airtight.
I think that generally, it's not a problem to puncture the plastic here and there. Sometimes people worry unnecessarily much.
 
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