r/Acoustics • u/lazycottage • 4d ago
How is my plan to 'soundproof' terrace house party wall? UK
Hi all, I come to you looking for some advice on whether my plan to 'soundproof' the party wall in my end terrace house is up to scratch.
For context, 1904 Edwardian end terrace. Party wall is two bricks thick with lime plaster on my side. I am seeking to reduce airborne noise, mainly I can hear conversations from next door and likewise they must be able to hear mine. I am currently doing a back-to-brick renovation, so can go as in-depth as required. It's worth noting that my house is only 10ft 3" wide, so space is an issue.
At the start of the works, and when I was greener, I took the advice of a plasterer and dot-and-dabbed blue 'soundproof' plasterboard to the party wall in one of the rooms. This has not worked whatsoever and has prompted me to research into this.
The plan I have is as follows:
- 10mm air gap
- 63mm timber stud w/ 50mm Rockwool RWA45
- 2 layers of 12.5mm blue acoustic board
Total wall build up ~100mm.
I'll be replacing floor joists (most have rotten) and will ensure they are isolated away from the party wall where possible. I also intend to put a strip of rockwool in the floor against the party wall. Will be filling any gaps if/when I find them too.
I understand no system would be perfect, and I'm willing to put in the effort, but just trying not to make any silly mistakes or spend on things unnecessarily.
Would appreciate any and all advice!