New interior wall/soundproofing

[rsvensso]

Hello

I live in a townhouse with an attached garage/storage area. The storage area has already been converted and is currently used as a bedroom. One of the walls adjoins the neighbor's patio, and it is quite noisy through the wall when they are on their patio during the summer. You can hear them talking. Today, the wall is likely 120 mm thick with single drywall on the inside. To create better sound insulation against the neighbor's noise, I plan to build on our interior wall in the bedroom as follows:

Existing wall
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10 mm air gap
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45 mm frame with insulation
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OSB board
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13 mm Gypsum board
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13 mm Gypsum board
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I plan to remove the existing drywall on the interior wall so that I can run new electrical wiring in the wall. Is this construction something you would recommend? Comments are welcome.

Best regards
RS

 

[Elvis69]

You are completely on the right track. The only change I would like to suggest (from a sound perspective) is that you use metal studs instead of wood and skip the OSB in favor of a third gypsum board.

Also remember that sound doesn't just come into the room through the wall. There is always a risk that sound is transmitted through connecting floors, ceilings, and through various penetrations.

 

[mikmal]

Isover recommends placing a sealing strip between the wall's top beam and the ceiling - similarly under the bottom beam and at the wall studs ... Check www.Isover.se

I don't know if it has a big effect or if it's Isover wanting to sell sealing strips ...

/Mikael

 

[rsvensso]

The reason for the OSB board is to have a good material to fasten other constructions to when mounting them on the wall, but I understand that triple-drywall is better from a soundproofing perspective.

Behind the existing drywall, which I plan to tear down, there is probably some foam plastic. Is it OK to keep it there, or should I remove it and place new plastic over the new framing with insulation?

 

[Elvis69]

The reason for the OSB board is to have a good material to fasten other constructions on the wall, but I understand that triple-gypsum is better from a soundproofing perspective.

Behind the existing gypsum wall, which I plan to demolish, there's probably some cellplast. Is it okay to keep it there, or should I remove it and place new plastic over the new framework with insulation?

I assume by "cellplast" you mean the moisture barrier, i.e., plastic foil...
It should be removed and placed as you mentioned yourself, over the new framework. An alternative is also to place the foil between the gypsum boards instead of placing it between the studs and the first board. A bit easier installation!