Hello, I have a plasterboard wall with a furring strip/air behind it, then plastic behind that (and insulation behind). How long should the screw be to secure in the plasterboard but not risk puncturing the plastic? Plasterboard is 13 mm, furring strip is 28 mm. So, I should be able to use a screw that is 13 + about 22 = 41, which gives me about a 5 mm margin? Is that the right way to think about it? I don't want to risk puncturing the plastic. Also, I wonder if the plug itself expands in depth in such a way that it could create more depth than the screw during insertion, potentially damaging the plastic? If instead, you screw into a furring strip stud, do you still need to worry about potential holes in the plastic behind the stud/furring strip?
You cannot attach things to a gypsum board with plastic plugs. You should not attach things to a wooden beam (sparse panel here) with plugs.
If you can screw into a sparse panel board, then do it; use regular wood screws and it doesn't matter if you puncture the plastic. If you cannot do that, you must use drywall anchors/expanders.
In general, I wouldn't worry about a small hole in the plastic, it's not airtight in many places anyway.
If you can screw into a sparse panel board, then do it; use regular wood screws and it doesn't matter if you puncture the plastic. If you cannot do that, you must use drywall anchors/expanders.
In general, I wouldn't worry about a small hole in the plastic, it's not airtight in many places anyway.