Yes, as the title suggests, how do you attach the vapor barrier to the metal studs?

I'm going to build a horizontal ceiling in the pool room where the rafters above have an angle of about 4º and therefore plan to "hang" the ceiling down to a horizontal metal stud construction. The problem is that it's not possible, as usual, to staple the plastic before installing the cross panel/secondary profiles.

Does anyone have a good tip on how this is done?
 
Double-sided tape?
 
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Yes, that's kind of the direction I was thinking, but it felt a bit strange to do so... Though maybe that's how it's done? Thanks for the answer anyway!
 
Isn't this something that is usually done?
In this case, I want to avoid wood for two reasons: the sensitivity to moisture if the plastic is not completely sealed, and to keep the weight down. Or am I wrong and should go for a wooden construction anyway?
 
S
Why not install the barrier in the rafters?
 
One of the reasons for lowering the ceiling is to make room for more insulation. The "trusses" or whether they should be called rafters are 220 high, and I want more insulation than that. We aim to maintain 30º in there year-round, so it needs to be well insulated. Therefore, I want the vapor barrier as low as possible, so it will have to be attached to the primary beams instead.

This is roughly what it looks like now:
Interior view of an unfinished room with exposed wooden beams and high windows, showing the progress of a ceiling renovation project.

The ceiling will be built on two levels, one higher over the pool and a slightly lower one along the edges, like this (the sketch is not complete with all the beams):
(Yellow is the trusses, green the outer roof, red the metal studs, and blue the ceiling.)

Sketch of a room ceiling with multilevel layers; yellow trusses, green roof, red beams, and blue ceiling over a pool area, showing planned insulation and vapor barrier setup.

Cross-section of a building plan showing roof construction with yellow rafters, green outer roof, red steel supports, and blue inner ceiling.
 
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Just make sure to check that the adhesive in the tape you intend to use is approved for use with the plastic, as some adhesives dissolve the plastic over time.
 
Good to think about. If tape is the "real" way to do it, shouldn't there be products developed for that purpose?
 
Butyl tape is a classic double-sided tape used for age-resistant plastic. Unfortunately, it's expensive as hell.
 
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