Where to find short drywall screws?

[Nissens]

I have insulated the exterior walls of a garage and inside the studs, there is an installation layer with horizontal 45x45 battens. In these, I have mounted 12 mm horizontal construction plywood with 40 mm screws, and relatively close together to withstand load. Right behind the plywood, I have a plastic (vapor barrier) that I don't want to puncture.

Now I'm planning to screw vertical drywall onto the plywood, which is 13 mm thick, but along the beveled edge where you screw a lot, it's just over 11 mm thick.

So, now I would like to have 12+11 mm = 23 mm drywall screws to attach the drywall.

The problem is that the shortest drywall screws I find are 19 and 25 mm long, so either too short or a little too long...

Is it possible to find 22-23 mm drywall screws somewhere?

 

[Tomtom79]

Do you have insulation outside the 45s as well? In that case, the plastic should be between the 45s and the frame so that the 45s actually form an installation layer on the inside of the plastic? That's the whole point of an installation layer, to avoid puncturing the plastic for all the boxes, flex hoses, and all other stuff you hang on the walls? Every nail or screw you put up in the future will puncture the plastic behind the plywood?

 

[Nissens]

Do you have insulation outside the 45s as well? If so, the plastic should be between the 45s and the frame so that the 45s actually form an installation layer inside the plastic? The whole point of an installation layer is that you don't have to puncture the plastic for all the sockets, flex tubes, and all the other stuff you hang on the walls. Every nail or screw you put up in the future will puncture the plastic behind the plywood?

Yes, I have insulation between the 45mm studs.

No, since it's a garage building that will only be around +5 degrees for long periods, the dew point ends up in the installation space, so the plastic should be directly behind the boards. If it were always around +20 degrees indoors, the plastic could be further into the wall.

There aren't many punctures in the plastic, mostly electrical boxes, but they are easy to make sufficiently tight. There was more work in the sloped ceiling with all the roof truss frames (W trusses) that had to be taped.

And no, since I know where the plywood is and how thick it is, I naturally don't use screws long enough to go into the plastic.

But my question is if there are 22-23 mm short drywall screws?

 

[Stuff]

mark the CC of the 45s on the drywall and use regular drywall screws there. Then it doesn't matter as much if it goes through since the screws will end up in the 45s. You can then add some short screws right along the drywall seams.

 

[Json_]

@Nissens - I'm in a similar situation now but will have two layers of drywall so I need two different lengths. Anyway, did you find any drywall screws that were 22-23mm?

 

[Plupp 405730]

@Nissens - I'm in a similar situation now but need two layers of drywall so I need two different lengths. Anyway, did you find any drywall screws that were 22-23mm?

Here you go..

https://www.conrad.se/sv/p/swg-1892...-philips-stal-fosfaterad-1000-st-1203716.html

 

[Nissens]

Here you go..

[link]

Absolutely not, these are for hard plasterboard and won't work on regular plasterboard. The heads are too small for regular plasterboard…

 

[Plupp 405730]

Absolutely not, these are for hard plaster and do not work on regular plaster. The heads are too small on them for regular plaster…

We have used them in specific situations when the screw was not allowed to go through the underlying sheet material..

 

[Nissens]

@Nissens - I'm in a similar situation now but will need two layers of drywall, so need two different lengths. Anyway, did you find any drywall screws that were 22-23mm?

After much searching, I didn't find any 22-23mm short drywall screws, found 19mm at Hornbach for example - but unfortunately they are for hardboard and have too small heads for regular drywall.

After some testing, I found that 25mm drywall screws work. The 2mm they are too long aren't enough to damage the plastic behind. An advantage is that they also anchor at the full depth of the plywood.

 

[Nissens]

We have used them in specific instances when the screw couldn't go through the inner panel material..

It is possible, but they are not intended for regular drywall, and I would never risk it with screws that have heads that are too small. It's not fun to have to redo the work after a few years.

 

[Json_]

After much searching, I couldn't find any 22-23mm short drywall screws, found 19mm at e.g. Hornbach - but unfortunately they're for hard drywall and have too small heads for regular drywall.

After some testing, I concluded that 25mm drywall screws work. The 2mm extra length isn't enough to damage the plastic behind. An advantage is that they also attach to the full depth of the plywood.

Thanks for the response! Was also considering that option a bit.

 

[Matti_75]

Screw in the horizontal studs and glue the vertical joints.

 

[Nissens]

Thanks for the reply! Was also considering that option.

Glue ages and letting the paper on the back hold the plaster in place feels risky, but the idea of using longer screws in the horizontal studs is good, then you can screw the rest with 25 mm screws. 😊

 

[Json_]

Glue ages and letting the paper on the back hold the plaster in place feels risky, but the idea to use longer screws in the horizontal studs is good, then you can screw the rest with 25 mm screws. 😊

That's exactly how it will be, thanks