Heavy radiator fixings into Thermalite block - advice needed

[BobbyBrown]

Hi,

I'm fitting a radiator to a plasterboard wall ready for the plumber to pipe up. Having had a quick peek behind the board though theres a large gap between the rear of the plasterboard and the thermalite block (60mm). I have used the Dryline Pro fixing (https://www.drylinepro.com/) for previous radiators that have worked well but none of them have had a gap as big as this. What would people recommend?

 

[rsgaz]

You'll have to span the gap with something, or the board will just crack. Here he's spanning some insulation, but it's the same principle...

You'll need the XL version, which goes up to 80mm...

https://www.axminster.co.uk/space-plug-adjustable-wall-cabinet-spacer-ax954705

 

[23vc]

Or cut out bits of board and put noggins in, kinda similar to what I’ve just said in your other thread but bigger battens/noggins fixed to the blockwork if it’s taking the weight of the radiator

 

[BobbyBrown]

Thanks for the replies, I think I'm going do go down the space-plug route. Total weight of the radiator filled will be 47.3kg. I'm thinking one space plug and hex screw per bracket (4 in total). Does this sound reasonable?

 

[ivixor]

Just use some long hamerfix fixings or similar: https://images-na.ssl-images-amazon.com/images/I/41BG-33EvRL._SL1000_.jpg

Drill hole, whack them in, job done. Used the same to hang incredibly heavy vertical rads, and they aren't budging.