Screw depth for heavy radiator

[markyyyyyy]

Wow, this radiator job isn’t going to plan. I drilled through an electrical cable last night. Anyhow, while I sorted it out I screwed some timber to the wall, and I’ve also done similar for one of the lower brackets where the plaster blew while drilling holes



Just after some advice.

The upper piece of timber+ plasterboard combined is 35mm thick. Would it be sufficient to get a 35mm screw through the PB and wood…. Will this be strong enough for a VERY heavy 1800 x 600 column rad? Or would I have to drill through timber, into wall behind and plug and screw?

The bottom piece of timber is thicker at 35mm, so I can screw a 35mm screw straight into this via the bracket. Would this give strong enough support or would I need to drill into the wall behind and plug?

Cheers

Upper piece of timber; plasterboard going over this

Lower piece of timber; no plasterboard going over this

 

[Wayners]

As long as 25mm of screw is in timber that should be fine.
35mm is plenty

 

[aveatry]

I can envisage that bit of wood splitting when you screw into it

 

[simplesteve]

Yip, good idea to pilot hole it first.
As it’s a very heavy 1800x 600 column rad I would also consider asking for the ( optional) floor supporting brackets ( feet ) instead of the bottom wall mounted ones.

 

[markyyyyyy]

I think I’m just going to drill through it and go into a bit of block work aswel, belts and braces

 

[asnoop20]

I would defo go into the brick/block. I fitted several tall radiators about that size and they came with 80mm coach screws and wall plugs for the same. I found the wall plugs weren't grippy enough and bought Fisher Duopower which are superb.

You might be ok if the battens are secured properly with plugs and screws but all mine were done quick with nails and many hadn't took. With the weight of the rad that's then asking for plasterboard movement and cracking.

 

[drives]

I used these to hang a heavy radiator and they were great.

https://www.screwfix.com/p/fischer-tx-duoxpand-hex-head-frame-fixings-8mm-x-120mm-4-pack/732hl

Just make sure they are the hex head rather than the TX ones. I bought one pack of the TX ones by mistake and they were a bit of a nightmare to tighten up.

 

[aveatry]

Another vote here for the Fischer duo plugs as a plug.

 

[cdbe]

I've just fitted two of these - my walls are "turbo" blocks, even more Wheatabix than normal thermalites, with plasterboard foamed on. I used 12mm plywood squares, with a second piece where the screws will go so 24mm in total. Glued (Stixall)and screwed (normal brown plugs but you only get one go at tightening them). Brackets fixed with 5 x 50 woodscrews.