Building and soundproofing a stud wall

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Thanks all, I think I will try and go for the design proposed by StephenStephen but will have to use shared top / bottom plates and no noggins. Probably then double skin soundblok on each side of the new wall, with Rockwool sound slabs in between.

Also thanks rulers&rulers, I'd never heard of anti vibration pads for washing machines so I'll definitely get one of those!

I'll report back in a few weeks once it's done.

Tim
Hi
Just wondering if you had a chance to do this ? I have a similar situation, and was interested with the idea of the offset joists, not seen that before and wondered if it did the job ? If so, Im going to give it a go. Also, with the washing machine, Ive been looking at different mats , pads etc- its tricky to know whats going to work. I was looking at the rubber mats on the Soundstop website, but looks like they are for soundproofing walls
 
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So the wall did all get built, as designed.

Since then it has been skimmed and dried out fully today.

It will be a few more weeks until it's all finished and a finished room, so I won't be able to post any results until then.

I did also get a thick rubber washing machine mat too, which will go under the machine once the finished floor is down.

Cheers
Tim
 
So, its 12 weeks on, somehow....

The rooms are all finished, and the wall is pretty good. You can't hear the machine operating really, just the rumbling sound through the floor of the spin cycle.

I got some pro help, and so the doors are tightly fitted and close to the floor which helps a lot.

Overall, I am satisfied with the results, although they may get better when the rubber mat finally gets put under the washing machine! (Woodwork now painted, just need a bead of silicone between skirt and floor before I do it)
 
I was really surprised at the soundproofing difference from getting a good seal all round the door, and then again at the difference from plasterboarding the back of the door
 
Plasterboard on the back of the door? How did you manage to make it look decent, and stay intact when the door was slammed?!
 
Plasterboard on the back of the door? How did you manage to make it look decent, and stay intact when the door was slammed?!
Wooden profile on the edges, thick single piece of lining paper, and once I've put the second door in, you'll rarely see it anyway.
It's too much effort to slam it, especially as the double seal flanges slow it down on closing. It's also a door which is rarely used, except by me.
 

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