Wash basin on dab and dob wall

[John]

I want to fit a new basin on a breeze block wall that is covered in plasterboard. The weight of the existing basin has pushed some of the plasterboard inwards at its bottom edge.

I was considering removing it and cutting out an area of P/B and screwing and gripfixing some plywood onto the breeze block and then skimming over before fitting the new basin. However, I wondered if I could get by with just injecting some Gripfix Adhesive through some holes in the plasterboard to harden the area. I will be using long basin mounting fixings so the surface just needs to withstand the compression to keep the basin rigidly fixed.

What are your opinions?

[The Natural Philosopher]

use car body filler.

[John]

Mmmm! Was thinking that the cartridge gun would be a good way of getting it to cover an area from a few small holes though.

[The Natural Philosopher]

could well work..

[geraldthehamster]

Is the basin on a pedestal? If not, replacing it with a pedestal basin ought to deal with the digging-in problem. The wash basin in my loo is also against a dot'n'dabbed block wall, and I don't have that problem.

Skim won't stick well to plywood.

Cheers Richard

[John]

Is the basin on a pedestal? If not, replacing it with a pedestal basin ought to deal with the digging-in problem. The wash basin in my loo is also against a dot'n'dabbed block wall, and I don't have that problem.

Skim won't stick well to plywood.

Cheers Richard

Thanks - no it isn't a pedestal. Very small (10 depth) basin - wall mount.

[Bob Minchin]

Make up some tubular spacers that go through to the block work and finish flush with the plasterboard. Screw through with plugs and big woodscrews to get a good grip in the wall.

Bob

[John]

I quite like the idea but I feel I would need to do something at the lower edge of the basin to prevent it pushing into the P/B as my old one has.