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But what if the op has metal studs or that corrugated cardboard walls.....???
i had this Thursday week ago and fitted 35kw boiler .... i predrilled the wall about 20 times and got where the steels are and used a ply bored and screw than to the studs and i promise you that would not come off
 
i alwayscut out the plasterboard and fit ply behnd the board and refix the plasterboard never hada problem never use hollow board fixings as they will always come off at some point
 
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its easier to cut out a 4" sq behind the rad and fit a plywood pad and repair takes me an extra 15 mins 100% better job
 
I've bolted radiators back to back before on that 2" thick eggbox stuff.

My preferred method is to expose some studs and fit ply level with the plasterboard. If it's not possible to find any studs a piece of ply stuck to the wall with gripfill and fixed with multiple cavity fixings is a lot more secure than just using the holes in the brackets with cavity fixings.

You can also get floor mounting stanchions for radiators.
 
if i come across paramount boarding (egg shell) i cut out 3" sq where the fixings are and use 2to1 bonding and cement goes off in no time at all and really solid
 
Had a few jobs in the past quite simular to this, but the way I had to go about it was to take the measurements of the rad when hung, and cut away the plasterboard and fix battons to the solid wall behind and make good the wall before hanging back the rad.. If the wall where it has to hang is just a plasterboard party wall, the only thing would be to build battens to the existing wall partitioning.. Well I'll go and have read of your other prvious posts.. Good luck.. Bet yul do a good job..:tongue:
 
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My glue and screw method ain't let me down yet and is a lot less hassle. I would only diff about with battens in the wall if the rad was a real monster

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