TV mount onto insulated concrete block wall?

Hayezer · 26-12-2025 07:57PM #1

Hi all, total amateur here who has never even used a drill before but looking to see if I can mount a TV without having to get someone in.

New build house and have been told by site foreman the wall is built with 75mm insulation, 150mm concrete, 75mm insulation. Believe it is ICF construction but I can reach out if more info is required.

2 main questions

1) Will my 20V Lidl Parkside drill/driver set be able for the concrete or would I need something like a hammer drill?

2) Any specific type of plugs/screws I should be looking to use? Assuming I'm looking to use something 100mm+. Was looking at Corefix 120mm screw/plugs from Screwfix but not entirely sure they are suitable

Thanks a million

niallb · 26-12-2025 09:02PM

Happy Christmas!

That's a lot of insulation if you've not done this kind of thing before.

A basic hammer action drill will deal with the concrete much more easily for you and probably give you a cleaner hole. Turn the hammer action off while going through the insulation or maybe use the drill/driver at slow speed. Only switch to the masonry bit when you reach the concrete.

The corefix 120 are as good a choice as you'll easily find.

The plug is 95mm long which only gives you 20mm in the concrete, but the metal collar will help transfer through the insulation.

Is the plate on the TV bracket flat to the wall and how thick is it? The screws in that corefix pack are 120mm, so should be plenty extra for your external mounts.

Check the weight of the TV too!

I've used the Corefix a few times around the house, and for a difficult wall, think they're well worth the price.

greenbin2 · 28-12-2025 12:01AM

The corefix are great, I have used them for all my curtain poles

There might be an air gap between the insulation and the concrete, so might need longer corefix

Hayezer · 29-12-2025 03:35PM

Happy Christmas to you too and a Happy New Year 😊

Yes the 95mm plug is my main concern given that the insulation is 75mm, plasterboard is (I'd imagine?) 12.5mm meaning total 87.5mm before hitting concrete; the plug is only just about going into the concrete?

Still thinking on giving it a go with them or just trying big 150mm concrete screws without anchors/plugs. Will be in the new year when I give it a go!

The plate on the TV bracket is flat to the wall alright

Hayezer · 29-12-2025 03:36PM

Happy Christmas to you too and a Happy New Year 😊

Yes the 95mm plug is my main concern given that the insulation is 75mm, plasterboard is (I'd imagine?) 12.5mm meaning total 87.5mm before hitting concrete; the plug is only just about going into the concrete?

Still thinking on giving it a go with them or just trying big 150mm concrete screws without anchors/plugs. Will be in the new year when I give it a go!

The plate on the TV bracket is flat to the wall alright

Hayezer · 29-12-2025 03:40PM

https://www.boards.ie/discussion/comment/124096403#Comment_124096403

Oh my god I'm inept with Boards but I posted another comment thinking I clicked Quote reply 😂

The Continental Op · 29-12-2025 04:27PM

https://www.boards.ie/discussion/comment/124101920#Comment_124101920

150mm concrete screws (or 150mm screws with 50-80mm plugs) will be fine. The trick is to drill the holes you need all the way through into the concrete then enlarge the hole though the plasterboard and foam so it can take some pipe the depth of the plasterboard + insulation. With the pipe in the hole you are tightening down on the concrete and not the foam. I'm sure you can find something cheaper but a quick look on Amazon came up with this https://www.amazon.co.uk/LAVMHAB-Thickness-Length-Seamless-Tubing/dp/B0CSFZJBYQ/

which you could cut to length. black 1/2inch heavy waterpipe would be another option.

This is the sort of thing I'm on about but without the sophistication of the adjustable standoffs.

https://www.youtube.com/watch?v=7DGGUbbbBZI

Tippbhoy1 · 29-12-2025 04:45PM

You will need a drill with hammer action to do this properly.

My house has 60mm insulation everywhere and I use 8x100mm concrete bolts where I need to carry some weight for something. Drill the pilot hole and then use a ratchet or a spanner to screw it in. They are rock solid.

If you’ve 75 I would think you’ll have to go for the 120mm. This might require you to go up to m10 which means a bigger hole. Keep in mind bolts won’t fit into a lot of fixture holes etc so mights work for everything. You can get concrete screws which are thinner but I find not as easy to use. Personally I’ve never done any sort of wall plug type solution at that depth, but I see there’s options so I’m sure they work. Doubt they would take as much weight though so depends on the need.

The Continental Op · 29-12-2025 05:25PM

OP if you have done nothing yet may I suggest you work out where your screws will go and then drill one small diameter hole say 5mm and find out exactly how deep the insulation is. Maybe its not as deep as the builder has told you. Either way that will let you know exactly what you are facing.

Mr321 · 03-01-2026 02:21PM

https://www.boards.ie/discussion/comment/124102159#Comment_124102159

I'd also recommend this and with it being a bracket you have a number of holes to use so the right length of corefix should do the the trick. If your going the concrete screws OP you will probably need an impact driver to screw that length of one's in. It can be done with a powerful enough drill but you'll be more at risk of snapping your wrist if you're not used to using them.

TV mount onto insulated concrete block wall?

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