Building and soundproofing a stud wall

[phatboy]

I am looking to build a small studwork wall to partition a bedroom so a small bit can be used as a utility (Washer & dryer),

Sound insulation of walls seems to be a minefield of information.

So far, I thought I would build the wall in 3" timber, and double plasterboard each side, with Rockwool sound bats inside it.

Is soundblok board any good? I read that 2x sheets of 12.5mm normal board was more effective?

Also read about resilient bars, but will this help?

Sorry it's a bit vague, I don't want to go too deep into my thoughts on it or I'll be writing all day!

Thanks
Tim

 

[John D v2.0]

if you want it soundproof enough to sleep while the washing is on you're going to struggle. Whatever you do with the wall it's going to come around the sides. What's the floor/ceiling construction? You're basically going to need the washer in a suspended cube with dense walls inside the room you've created.

 

[phatboy]

I thought the washer was going to be pushing my luck tbh, but the dryer I have hope for! The bedroom is going to be for a baby, so sleep will be during the day and night of course.

The floor is suspended timber with 18mm ply (well it will be once heat insulated). Ceiling is timber with plasterboard and loft space above. The stud wall will join at both ends to a blockwork wall.

Thanks
Tim

 

[StephenStephen]

I found the response to my question here: https://www.diynot.com/diy/threads/what-to-stick-on-to-soundproof-back-of-door.457487/#post-3632010 very helpful.
I've not had chance to test the results yet

 

[phatboy]

Thanks, so there may be some real benefit in soundbloc? I think I will get little choice in those boards here, but have seen blue soundbloc being used.

Building 2 separate partitions 10mm apart will unfortunatly make a small room even smaller

 

[Johnpaul Manning]

Most often building 2 stud walls in a residential home is not practical. Your best option I think would be to use a rubber matting between the stud and the floor if possible and use your Rockwool Flexi-slab or similar in the walls with a a soundbloc 12.5mm slab. this will be a good result. If you want to double up a standard plasterboard 12.5mm that will be a good job also instead of a soundbloc.

 

[StephenStephen]

Thanks, so there may be some real benefit in soundbloc? I think I will get little choice in those boards here, but have seen blue soundbloc being used.

Building 2 separate partitions 10mm apart will unfortunatly make a small room even smaller

One idea is to have 2 sets of joists which are slightly offset (10mm for example) from each other, sommat like this:

 

[phatboy]

One idea is to have 2 sets of joists which are slightly offset (10mm for example) from each other, sommat like this:
View attachment 118162

How would one go about doing that, with the top and bottom plates?

 

[rules&rulers]

Hi,have used phonestar boards on renovations http://www.acaraconcepts.com/soundproofing/soundproofing-walls/ their site has some useful tips/history.

To reduce vibration from washing machine into the floor,anti vibration pads are available to fit under the feet or Anti-vibration Washing Machine Mats with a 18mm ply on top,also work.

Good luck,great idea.

 

[StephenStephen]

How would one go about doing that, with the top and bottom plates?

either two narrow plates, or if you have enough solid fixing points or/and can use glue to stop movement, use single shared plates

 

[endecotp]

How would one go about doing that, with the top and bottom plates?

3x2 verticals and 4x2 horizontals; or 4x2 and 5x2 etc.
Thread your fibre around the studs so that it is continuous.

The challenge is noggins. The obvious solution is to not have any. If you do have them, you could have e.g. 2x2 nogs, 3x2 studs and 6x2 plates. Or you could make "ladders" with pairs of verticals with studs between them, alternating from one side to the other.

 

[phatboy]

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

 

[chappers]

that's the normal method, bring your studs for each leaf close together but not touching and insulate between and double check board on each side. Don't expect to completely eliminate the sound of a washing machine

 

[phatboy]

that's the normal method, bring your studs for each leaf close together but not touching and insulate between and double check board on each side. Don't expect to completely eliminate the sound of a washing machine

With Soundbloc, or regular plasterboard? It would be tough to provide separate top and bottom plates, so is it 'OK' to have these shared?

I guess I will need a deep door lining to accommodate 100mm base and top, and double boarding each side!?

Cheers
Tim

 

[chappers]

nah just single layer each side. soundblock is also known as double check