Attaching kitchen island to concrete floor - screws and plugs

Relik · 16 Apr at 7:42 AM

Hello
I'm going to attach a kitchen island to a concrete floor. I'm completely lost when it comes to screws and plugs for this purpose. Ikea suggests using a screw with a "rounded" head. The kitchen island should be secured with 4 screws into the floor. My questions are:
- How long and thick should the screws be?
- Are the screws the same ones used for wood, with the difference that you insert a plug into the hole first?

I've tried searching on the hardware stores' websites for specific screws to be used with plugs but can't really find what I'm looking for.

Best regards
Björn

Nicro · 16 Apr at 8:54 AM

Yes, it is the same screws as for wood.

Buy this or something similar. Then buy a screw that is 6mm and about 45mm + the thickness of what you are attaching. Drill an 8mm hole 50-60mm deep, depending a bit on the screw length. The screw should go through the plug.

https://www.byggmax.se/universalplugg-fischer-duopower-8x40mm-p246717

Demmpa · 16 Apr at 9:23 AM

Is it a bare concrete floor or is there something on top, like parquet?

The screw should not be self-drilling when using a plug.

Relik · 16 Apr at 9:45 AM

Demmpa said:
Is it bare concrete floor or is there something on top, for example parquet?

The screw should not be self-drilling when using a plug.

It's bare concrete, or rather, there's tile that I will first drill a small hole in and then there's concrete.

InsidersUnited · 16 Apr at 9:49 AM

What do you have in the kitchen island? I have a medium-sized one with an oven, hob, and an oak countertop, it's not attached to the floor. It weighs a ton and wouldn't move if an elephant leaned against it; the legs would probably break first.

Relik · 16 Apr at 9:50 AM

Nicro said:
Yes, it's the same screws as for wood.

Buy this or similar. Then buy a screw that is 6mm and about 45mm + the thickness of what you want to attach. Drill an 8mm hole 50-60mm deep, slightly depending on the screw length. The screw should go through the plug.

[link]

Would these plugs together with 6x50 mm chipboard screws work together? The bracket to be attached is at most 2-3 mm thick. Then comes a tile and some fixings, leaving about 40 mm of the screw in the concrete. Is that too little to provide good anchoring so the kitchen island doesn't tip over?

https://www.bauhaus.se/spanskiveskr...61321&indexName=nordic_production_sv_products

KMNelhas · 16 Apr at 9:53 AM

Underfloor heating in the concrete slab?

Relik · 16 Apr at 9:53 AM

I InsidersUnited said:
What do you have in the kitchen island? I have a medium-sized one with an oven, a stove, and an oak countertop, it's not attached to the floor. It weighs a ton and wouldn't move even if an elephant leaned against it; the legs would probably break first.

It's just drawers, but the countertop is pretty heavy, like 50 kg, and will have an overhang of about 20 cm on two sides, so I don't want it to tip over when the kids hang on it.

Relik · 16 Apr at 9:54 AM

K KMNelhas said:
Underfloor heating in the concrete slab?

Yep, rented a thermal camera to avoid the loops. Routed grooves for electricity to the kitchen island earlier and then the thermal camera was worth its weight in gold!

KMNelhas · 16 Apr at 9:56 AM

R Relik said:
Yep, rented a thermal camera to avoid the coils. Routed tracks for electricity to the kitchen island earlier and the thermal camera was worth its weight in gold!

Nice! Then you've got it under control. 💪

Demmpa · 16 Apr at 10:01 AM

R Relik said:
Are just cabinets but the countertop is quite heavy, about 50 kg, and will have an overhang of upwards of 20 cm on two sides so I'm thinking I don't want it to tip over when the kids hang on it.

Is the overhang on opposite sides or do they form a corner?
How deep is the cabinet/cabinets where the overhang is?
Are there two cabinets with their backs against each other?

Sketch of the kitchen island, both the cabinets and the overhang?

Nicro · 16 Apr at 10:18 AM

R Relik said:
It's pure concrete, or it's tile that I will first drill a small hole in and then it's concrete.

Then choose the one that is 65mm instead and adjust the screw accordingly. An 8x65 has a pull-out value of 230kg (x7 incl. safety factor) so it will be very sturdy.

Relik · 16 Apr at 10:27 AM

Demmpa said:
Are the overhangs on opposite sides or do they form a corner?
How deep is the cabinet/cabinets where the overhang is?
Are there two cabinets with their backs against each other?

Sketch of the kitchen island, both the cabinets and the overhang?

They form a corner. Attaching a picture as illustration.

Relik · 16 Apr at 10:41 AM

Nicro said:
Then choose the one that is 65mm instead and adjust the screw accordingly. An 8x65 has a pull-out value of 230kg (x7 including safety factor) so it will stand very firmly.

I am really struggling to find suitable combinations of plugs and screws, but would it work with:
Wood screw 5.0x60 mm
Universal plug 6 x 35 mm

And if I then add a couple of extra angle brackets to the "frame" to secure the kitchen island?

Demmpa · 16 Apr at 10:42 AM

So it's four cabinets joined together, two 800x600 and two 800x400 next to each other, so the total floor area the cabinets occupy is 1600x1000 with a countertop weighing about 50 kg.

Is one short side against a wall?

It doesn't need to be screwed to the floor, it won't tip over even if five adults stood at the far end of the overhang on the long side.