This thing about plugs and screws again...

[Starmac]

OK, beginner here with a prefab house to move into.

The exterior walls consist of 13mm drywall and 11mm plywood. I'm going to install a wall storage system (Algot from IKEA) in my built-in closet but I'm unsure about plugs and screws. For the studs, I assume I just drill in regular wood screws. But should I drill and plug where I have drywall & plywood? Which plug and which screw in that case?

Thanks for the help

 

[vilpi]

Use long screws and it will be fine.
Almost the whole point of plyfa/OSB is to avoid using plugs.

 

[HSP]

No pre-drilling, no plug. Screw directly into the wall.

 

[myrstack]

Length can be deceptive to look at only. In your case, you should ensure that you have threads on the screw for your plywood. It won't hurt with the drywall either but your plywood will take all the load. Adjust the head for what you are going to put up with.

 

[Starmac]

Thank you for all the quick and good answers. Skipping plugs and going with 4.5 x 40mm wood screws.

 

[corre]

That will be great! Be careful not to tighten too much if you're using a machine; if you're unsure, it's more appropriate to hand-screw the last part until you get the hang of it. If you tighten too much, the wood fibers will be pulled out of the hole and the screw won't hold well.

 

[Starmac]

OK, I'm using a Makita 456 new screwdriver. I assume you set the power from 1-9 on the dial at the front. I'll have to experiment.

 

[VikHe]

Using the torque setting on a screwdriver can be quite difficult. It's easier to sneak the last bit instead; you can feel when the screw is at the bottom, and just then you release the "gas"
Or hand screw the last bit as corre suggested.

 

[hantverkare1]

Agree. Never use the torque setting.

 

[NotHandyMan]

I also have a question about screws and plugs.

-What exactly is a universal plug? Is it universal regarding the screw or the hole you make with the drill? Which doesn't sound correct either way... (if the plug could be adjusted in shape and size, then I would understand how it was "universal")

-I have a plug that is 3 cm long and a screw that is 3.5 cm long, does it work?
I spoke with a friend who said it's okay for the screw to be longer than the plug, even that it's preferred as it provides a better grip... Is that true?

 

[VikHe]

Normally, the screw SHOULD go further than the plug.
So 35mm to 30mm plug sounds somewhat short, the screw should also pass through the material being fastened, right?

 

[NotHandyMan]

"Normally, the screw SHOULD go further than the plug."
But it does in that case; by 5 mm. But do you mean that's still not enough?

"So 35mm to 30mm plug sounds somewhat short, the screw should also pass through the material being fastened, right?"
And it does. Naturally.