New structure - Soundproofing

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mcgibbon

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Hello everyone,

I am planning on building an entirely new structure at the back of my house in the garden which will have 2 new rooms. The one room I will use as an office and the other room will be a music room and I want to soundproof just the music room and I would like some advice on how I should do it. Basically from the existing house I will have a door going into the the new office and then from the office I will walk down a small passage which leads to the music room. At the beginning of the passage there will be a door and at the end of the passage there will be another door. The music room will have no windows and will have a double concrete foundation incase I wish to extend upwards at a later date. The music room will also have a flat concrete ceiling. Another thing is the house has a garden inbetween all the neighbours (10 meters away)

Am I safe in assuming that a double concrete foundation will eliminate the need to treat the floor in the music room? What about the roof? Will a slab on concrete be a good start and then start building a room within a room?

Seeing as the structure does not exist yet I want to get the best options possible before I start. I was planning on putting up a double brick around the music room and then have another single brick wall 6 inches in from that and I thought that that may be good enough but after reading a few articles on the web it seems that it wont be. I am not too worried about space as the music room dimensions are quite large.

I was planning on raising the floor in the passageway with another slab of concrete so that when you get to the music room you open the door and take a step down into the music room. That way I can ensure that when the door closes its tight fitting on all 4 edges to the door frame. I will use some form of a rubber seal to assist making it as sealed as possible.

Once the room has been built to stop the sound from getting out I will treat the sound accoustic. I have attached a small jpg image of the layout of the room.

Anyone have any ideas/thoughts on this?

Many thanks in advance!
Grant
 

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Am I safe in assuming that a double concrete foundation will eliminate the need to treat the floor in the music room? What about the roof? Will a slab on concrete be a good start and then start building a room within a room?
By double, you mean with footers for structural support of additional levels, it is fine. Double or single, a slab foundation offers good isolation due to the damping of the earth. So, yes you are on the right track.

Seeing as the structure does not exist yet I want to get the best options possible before I start. I was planning on putting up a double brick around the music room and then have another single brick wall 6 inches in from that and I thought that that may be good enough but after reading a few articles on the web it seems that it wont be. I am not too worried about space as the music room dimensions are quite large.
That is possibly a good wall configuration as long as the double brick has no air space and is solidly coupled together. Your interior single brick should be spaced away from this exterior wall by the choice of rock wool thickness, ie; 50mm or 100mm. 100mm should be sufficient.

I was planning on raising the floor in the passageway with another slab of concrete so that when you get to the music room you open the door and take a step down into the music room. That way I can ensure that when the door closes its tight fitting on all 4 edges to the door frame. I will use some form of a rubber seal to assist making it as sealed as possible.
Building a small ramp is easier than raising the whole floor...

Once the room has been built to stop the sound from getting out I will treat the sound accoustic. . .[/QUOTE]

Grant,
Treating the room with acoustic products will not help sound from getting out. ;) But it will help the room to sound right/balanced. The isolation construction will prevent sound from getting in or out.

Are your measurements in metric?
Cheers,
John
 
Hi John,

Thanks for your reply. What kind of rockwool should I be looking for? Cavity? Do you know any good websites that offer the kind I should be looking at?

Many thanks
Grant
 
Grant,

This is what I am recommending for the cavity fill:
PINK FIBERGLAS™ Insulation R-19
But it depends on where you are in the world... There may be other products that are more cost effective in your region.

Cheers,
John
 
Hi John,

Thanks for the info. I spoke to of the builders about it and he said that I could use builders sand inplace of the rockwool? Doesnt sound right to me... What are your thoughts on the building sand?

Cheers,
Grant
 
Grant,

Nope. Sand is good for mass, but it will couple the decoupled walls. Do not do that. Use light Rock wool or fiberglass insulation in the cavities.

Cheers,
John
 
Can't wait to see this when it's finished!
I built a room inside my rental house. 2x4 construction mounted to the concrete slab. Drywall>Insulation>1# massloaded vinyl>Iso clips>Channeling>Drywall>Green glue>Drywall. And lots of acoustic calking, isolation tape and some lead tape. 3000 staples.
The house is old with no attic and single pane windows and you can hear voices through the walls.
But, you cannot even hear the drums in the backyard. We play loud and you cannot hear anything 10 meters from the room.
 
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