Rad brackets, plasterboard onto lightweight thermalite wall.

I recently have had some work in my lounge and it the builder plasterboarded over the original plaster/render onto the thermalite block wall.

As the plaster boards were dot and dabbed, in order to fix the rad brackets to the wall do I need any kind of special fixings to go through the plasterboard and plaster/render and into the blockwork behind?

I guess I would have to use quite long fixings to ensure that a lot of the body of the fixing was secure in the blockwork wall to support a lot of the weight.

Any suggestions please???

I think you've answered your own question. Long screws into plugs or buy the long all in one type.

You can use the type of screws they use for PVC window fixing, you just drill a pilot hole and then screw them straight into the block, no plugs needed.

Dont try to screw straight into block without drilling the pilot first because it doesn't work.

Thanks to both of you for the reply.