Idea Check - Nuwave sound insulation plus Plasterboard

Hi All,

I have a solid brick wall (1926 bungalow) between a toilet and bedroom that has cracking in the plaster and also lets a fair amount of toilet flushing water noise into the bedroom. The cracking is relatively fine running diagonally across the wall, in many places the plaster is spalling off with the acrylic paint holding it in place.

So I'm thinking I can kill two birds with one stone by sticking a product like this nuwave sound insulation onto the wall:
Insulwest : : Noise Control : : NuWave
and then putting some plasterboard over the top.

My approach would be:
1. Chip off all loose wall plaster along the cracks
2. At regular spacings on a grid pattern chip off the wall plaster back to the bricks (thinking its more reliable to bond to the bricks?) and stick on plasterboard "mounts" for the plasterboard sheets, like the tip here How To Stick Plasterboard Or Drywall Over a Rendered Plaster Wall
3. Cut out holes in the sound insulation at each mount block and stick that on. Actually probably easier to run it in strips vertically between the blocks and use small offcuts in the gaps between the mounting blocks.
4. Glue the plasterboard to the mounting blocks and flush the edges.

But what do you reckon?

Would just adding some more plasterboard might reduce noise enough anyway? Is it possible to just screw or nail the plasterboard to the exising wall if I don't worry about the sound insulation?

Cheers and thanks,
Paul


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