Author Topic: adding extra wall  (Read 4186 times)

jbjb

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adding extra wall
« on: March 09, 2009, 11:06:44 PM »
Hello,

I live in a 1950s semi built with red brick, the partition wall is 2 bricks thick between our living room and theres.

The mother and daughter have a awefull shreeking laugh that 'when it reaches a certain level it cuts through the wall like a knife through butter!...the sound also travels along the sidewalls, ceilings and through the chimney breast into our living room.

Hear goes!....i was thinking of building a solid block wall (dense blocks) inside the alcove between the chimney breast & sidewall where the sound penetrates through the most, the wall could go upto a thickness of 10" inchs (2 layers of blocks, each block is 4" thick.) and fill behind the blocks with cement, the gap between the blocks and the partition wall would be 1" aprox and that would be filled soild with cement, no dead air space as i want as much mass as possible to reduce vibration....also im thinking of building a nice thick wall on the outside of the house almost in line with the partition wall and attach it to the house to send vibrations off in a different way rather than shooting up the side walls.

also the party wall between our living room and dining room seems to be a bad offender as sound travels straight up this into our room, the party wall is a supporting wall (naturally) and thus is under tension so when you hit it with the side of your hand it acts like a drum skin.....terrible.

Please let me know what you think of this idea.

just to let you know...I have used a well known soundproofing technique for my bedroom using resillient bars, plasterboard sheets and rock wool, this is very good indeed for the money it cost and im quite satisfied with it...which is good for my heart and adrenaline system!

Cheers.

JBJB


Randy S

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Re: adding extra wall
« Reply #1 on: March 26, 2009, 05:00:56 PM »
WOW. Well you should end up with a great STC rating, however when your dealing with vibration so you do want to decouple from the existing structure as you did when using the resilient channel. The 1" space you mention would be better filled with SSP Foam mat, instead of cement this will give you the decoupling you need.
http://www.soundproofing.org/sales/prices.html
Mass is for airborne sound
Decoupling is for vibration, impact and LF.

Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

jbjb

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Re: adding extra wall
« Reply #2 on: March 26, 2009, 10:23:49 PM »
thanks for taking the time to reply randy,


I went ahead and built a wall between the side wall and chimney breast (alcove) using breeze blocks 18" across and 6" from back to front, i think i used 25 or so blocks, i did 2" thick concrete between the blocks and original wall so i ended up with about 8" solid wall but guess what...i just read on another site that using breeze blocks is not so good because the nature of the blocks (although heavy and dense) are full of little holes, when you put your mouth to the block and blow the air goes straight through!...i wish i had found that info before building with those blocks, also the word "breeze" should say something lol
anyway, the wall was finished with all cement work done around the blocks and around the edges of the alcove to give a good seal, so now im looking at unplastered/rendered blocks and waiting/listening to see if it made a big improvement or not.... most sounds came straight through the wall as though it wasnt there grr!, what a swine, so then i rendered it with 2 coats and finally plaster, this improved the soundproofing considerably to which i was relieved somewhat however im not stopping there, i will attach 2 sheets of drywall using green glue type material to help further improve the soundproofing and making sure to seal well and not contact any other offending walls, work in progress..

also im going to cover the chimney breast with drywall and green glue as the sound poors in there, same for the side walls about 3ft into the room from the party wall.

your right with the vibration and airbourne sound theory, i wish i had focused on vibration more, iv learned a lot though   ::)

be in touch,
Thanks
Jb

Randy S

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Re: adding extra wall
« Reply #3 on: March 26, 2009, 10:54:01 PM »
Wait....are you still dealing with the vibration??
Give me a call at the office before you keep adding material that wont help in reducing the problem.

1-888-942-7723
8:00a.m.-5:00p.m. PST
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

jbjb

  • Guest
Re: adding extra wall
« Reply #4 on: April 21, 2009, 09:09:36 AM »
Wait....are you still dealing with the vibration??
Give me a call at the office before you keep adding material that wont help in reducing the problem.

1-888-942-7723
8:00a.m.-5:00p.m. PST

soon after i took out some bricks from under the fireplace lintel (to gain access to the chimney) and filled the empty space around the boiler flue pipe with some rock wool/insulation, alsi i noticed that there was a small amount of light at the top of the chimney when looking up so i re sealed the top.
the soundproofing is better but im still not satisfied, i can still hear voices/conversation when slightly raised

randy, im from the uk btw
thanks,

John

 

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