ᐅ Vapor Barrier Tightness in New Construction: Are Screws a Problem?

Hello everyone,

I’m back again. Our regional and preferred provider would build us a timber frame wall with mineral insulation.

This construction method is new in their offer.

It would include a fiber-reinforced paper vapor retarder, followed by an engineered wood panel, and finally a gypsum board.

The assembly would be:

60mm (2.4 inches) mineral insulation
240mm (9.4 inches) timber studs
240mm (9.4 inches) installed insulation
Paper vapor retarder
Engineered wood panel
Gypsum board

Are there any considerations regarding airtightness, especially related to screws, nails, and the vapor retarder?

I definitely want to prevent moisture from entering the wall and insulation.

Thank you very much.

Best regards
Sky

I made a typo!

First comes the wood-based panel, then the vapor retarder, and finally the drywall.

So: 12mm (0.5 inch) wood-based panel
Paper vapor retarder
12.5mm (0.5 inch) drywall panel

How long should the screws be when mounting objects?