How to soundproof a wall that has no insulation in the cavity

Adding layers of plasterboard to a wall to increase the soundproofing may not yield great improvements if there is no insulation in the cavity.

It is reasonably easy to knock holes in the wall between the studs and above and below the noggins. Then you slide some insulation up and down into the slots just created.

Simple pink batts are sufficient. In this case we used some scraps of 32kg glasswool that were lying around to get rid of them. If you can, spread the insulation around in the cavity as it will perform slightly better than if it's all stuck in one corner. You can use a stick to push it around.

Then you simply put rough patches in the holes and plaster over them.

A bit of plaster cement and a quick sand and it's ready for a layer of plasterboard and Green Glue

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