I have only built with wood before, but now I thought I would try building an interior wall with steel studs. Idiotic! Can anyone help me understand what screws I need for the following:
1) 15 mm k-plyfa in regular norgips steel studs
2) 13 mm drywall through k-plyfa into stud (as I understand it should be done - fastening the drywall to the stud, not just the plyfa)
Screw the plywood well and then screw the drywall only into the plywood next to it with a regular short drywall screw. Problems only arise if you try to screw through both the plywood and the metal stud.
Just screwing plywood into a steel stud isn't the easiest task. Especially not with 15mm since the screw often tears the stud before the board bottoms out against it.
You need to find a screw that has just the right amount of thread release to not get stuck in the plywood, but not too much that it doesn't grab the stud.
You can try using a self-drilling wing screw that works well with plywood against steel.
For the drywall, use double drywall screws for steel studs through the plywood into the stud.
That screw is too long and all boards must be screwed to the studs to follow the rules.
Correct me if I'm wrong, but: In most cases, plywood isn't required under drywall. 15-gauge plywood is a structural element. Therefore, drywall can be attached to it without also being attached to the studs.
Here you can read what Norgips says about screwing boards. All major manufacturers say the same thing.
It is a common misconception that you can screw into only the plywood, but as mentioned, it is incorrect.
Screwing plywood into a steel stud is not the easiest task. Especially not with 15mm as the screw often tears the stud before the board is flush against the stud. You need to find a screw that has just the right amount of threading to not get stuck in the plywood but not too much that it won't grip the stud. You can try using a wing drill screw which works well with plywood to steel. The drywall is screwed with double drywall screws for steel studs through the plywood into the stud.
It was damn hard to find a screw that fits! The wing screws cost a fortune where I shop. I found some chipboard screws with a 12 mm unthreaded section. And then the fully threaded chipboard screw from Grabber I originally looked at, 3.8x41 mm. Maybe it's time to simply pre-drill the plywood. It's a relatively small number of screws to be done, about 150.
Ssturnus said:
Correct me if I'm wrong, but: In most cases, plywood isn't required under drywall. 15-gauge plywood is a structural element. Therefore, drywall can be attached to it without also being attached to the studs.
I'm building a våtrumsvägg per Säker Vatten. Slightly overworked because it is not a wet room but a toilet, but I find peace in building a bit over spec and it is a proven design.
How do you plan to solve this when the plywood is 90 cm wide and the plaster is 120 cm wide? Besides, the boards are often laid crosswise. Manufacturers are looking out for their pockets by trying to sell their "one-size-fits-all" systems. As I mentioned, the plywood is a structural element in this case, so plaster can be attached to it. If you have any justification for the risks of this solution, I'd be happy to hear about it. And the manufacturer's RECOMMENDATIONS are just that, recommendations.
Norgips advises against using wood-based boards directly behind plasterboards, instead use our crossbar bracket.
The above statement from NORGIPS confirms what I wrote. They don't even recommend using plywood under plaster, so you'll just have to BUY THEIR mounting reinforcements, which contradicts industry recommendations for wet rooms.
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Matti_75 said: