Will the nail plugs hold up the Elfa hang track?

[Ett_unikt_namn]

Hello,

I have set up a wooden stud that is 20 mm thick (68 mm wide) against a hard concrete wall using plug nails that are 45 mm long. So the plug nail goes about 25 mm into the concrete. On average, there is one plug nail every 25 centimeters along the stud. Over the wooden stud, I placed double plasterboards.
On the plasterboards, I will attach an Elfa shelving bracket screwed into the plaster and the wooden stud.

Will it hold for an Elfa shelving system?
Or do I need to fasten the shelving bracket by going through the double plasterboards and the wooden stud and attaching it directly into the concrete?

(I also thought of unloading the hanging track by placing it directly on the floor, for whatever it's worth)

 

[tergo]

for 20 mm timber, you should use 8x80 nail plugs

 

[Ett_unikt_namn]

for 20 mm wood, you should use 8x80 nail plug

Not according to the instructions.
For Nail plug 5/25/45mm applies:

Dimension x Length: 5x45 mm
Min. Mounting depth: 22 mm
Max Detail thickness: 25 mm
Drill diameter: 5 mm

I.e. it should be able to support 25 mm.

But now I read that "Practical load capacity for concrete and solid brick": Shear load kg = 28 kg

Is it true that only 28 kg can be hung on such a plug??

 

[Isakare]

Yes, they were a bit short anchor plugs, but easily fixed. Drill a few holes for longer plugs, for example, 110 mm from the plasterboard measured, for 80 mm plugs. Drill a bit larger through the plasterboard and insert the plugs down to the wood. You don't need a large quantity; cc 60 is sufficient. Drill behind the rail to cover the holes, or fill them with putty.

 

[Ett_unikt_namn]

Ok, thanks! I'll put in some deeper extra anchors so the wooden stud holds anyway.

However, I'm unsure how to attach the mounting rail, since I now have 25 mm gypsum + 21 mm wooden stud = 46 mm.
According to Elfa, you should use a screw that is 60 mm long if you are attaching to wood.
Now I don't just have wood, so I might need to use an anchor, but the screw is too long.

 

[Ett_unikt_namn]

I would need to drill into the concrete when I put up the carrying rail since the screw is so long.
And use a universal plug that goes through the plasterboard, the wood, and maybe something in the concrete.

 

[Isakare]

Kill two birds with one stone, buy long plugs and screws, so the rail also attaches to the concrete, then you won't need any extra for the wooden board.

 

[Isakare]

With a 100 mm plug/screw, 55 mm will be in the concrete and 20 mm in the board, which is already attached decently, and it won't come loose.
A tip if you don't already know it. Make sure the screw doesn't have a cutting tip or threads when using a plastic plug, and drive the screw until it stops, not a bit extra as one tends to do, as it can reduce the screw's grip in the plug.

 

[Ett_unikt_namn]

With a 100 mm plug/screw, 55 mm will sit in the concrete and 20 in the board, which is already secured nicely, and it won't come loose.
A tip if you don't already know it. Make sure the screw doesn't have a cutting point or threads when you're using plastic plugs, and tighten the screw just until it stops, and not a little extra as you might want to, as that can reduce the screw's grip in the plug.

Thanks for the response!!
But isn't it better to use a nail plug that is 100 mm?
Because a 100 mm plug/screw usually means the plug is much shorter than the screw.
So the screw might end up mostly exposed in the concrete without the plug, and I don't know if this "counts".

 

[Ett_unikt_namn]

Anyone know?