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Author Topic: Sound Proof a Concrete Room  (Read 1624 times)

Offline g0d5_g1ft

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Sound Proof a Concrete Room
« on: November 12, 2006, 10:23:36 PM »
Hey guys i know there are soundproofing threads here but i just wanna get something that is more tailored to what i have... ok my room is about 3x5 meters, the wall and the ceiling are made of concrete and with that a layer of gypsum board about a foot away from the actual ceiling. the thing is i had this provision for an airconditioning unit on one of my walls, and i have a window too, these are where the sound escapes to the outside world, i was wondering how can i effectively reduce the sound coming out of my room? i dont have a band in the room, its just me and the drums, i usually play along mp3s and just want to reduce the sound (noise) outside. thanks!


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Offline BAMF

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Re: Sound Proof a Concrete Room
« Reply #1 on: November 13, 2006, 09:42:10 AM »
Tamang tama. I'm about to order soundproofing materials na...I'll offer it here na para kung iko-correct ng experts...

I'm going for a double wall of gypsum board. Costs about 336 sa MC Depot, each panel is 4X8'. It's installed using metal "studs" which space it about 2 inches away from the concrete wall.

Reading up on it, there are many schools of thought. One school says that there should be nothing inside the wall but an air cavity (nothing inside). Another school of thought says pack the space between the concrete and gypsum wall with glass fiber blanket. I think I'll go somewhere between and put some 25 mm glass fiber (that's about 1 inch, halfway) blanket in between.
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Offline mikep

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Re: Sound Proof a Concrete Room
« Reply #2 on: November 14, 2006, 03:24:35 AM »
gOd5_g1ft, I have a question.  You want to lessen the noise coming from the outside, or you want to lessen the noise going to the outside?  First, use split type aircon.  Seal off your window airc con hole.  Second, seal off any window, etc. by making sure that any possible opening is caulked or sealed with silicon caulking material.  Put heavy drapes on two portions of the wall.  Put the drapes about 2 to 4 inches from the wall.  That will help your sound in your room.

BAMF, you put glass fiber in betweem the leaf of the walls to remove resonances, not for sound proofing purposes.  There is no such thing as the first school of thought in acoustics.  Always put insulation in between the leaf of walls.  Use 50 mm or 2 inches.  1 inch will not really matter much.  Use fills, about 16 kgm - those that come in rolls, no foil backing.  Glass fiber is your best isolation.  Instead of using one gypsum per side, use two.  The heavier or denser the wall, the better it is to stop sound from seeping through.  Also, caulk all joints with non hardening caulking material, but silicon caulk will do.  For your room acoustics, follow the one I outlined above.

Good luck.
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Offline Agent_So

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Re: Sound Proof a Concrete Room
« Reply #3 on: November 14, 2006, 01:30:09 PM »
guys tanung ko lang.. since the threadstarter stated na yung room nya is concrete.. why soundproof it? diba ang problem nalang dito is windows and doors? i think acoustics nalang solution sa room.. pero sa window and doors, that im still configuring out para sa studio...


better install a split type airconditioning unit para sealed talaga ang room mo..
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Offline KitC

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Re: Sound Proof a Concrete Room
« Reply #4 on: November 14, 2006, 02:37:55 PM »
guys tanung ko lang.. since the threadstarter stated na yung room nya is concrete.. why soundproof it? diba ang problem nalang dito is windows and doors? i think acoustics nalang solution sa room.. pero sa window and doors, that im still configuring out para sa studio...

If you read his first post, he wanted to reduce the amount of sound leaking out of his room. I agree, however, that the windows and doors should be among the first order of business, but you still cannot discount transmission thru walls.

To our resident acoustics experts, how effective would wall mounted and corner mounted bass traps be in reducing sound transmission thru walls? How about Heimholz resonators?
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Offline skunkyfunk

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Re: Sound Proof a Concrete Room
« Reply #5 on: November 14, 2006, 03:14:10 PM »
soundproofing = trying to make the room airtight

corollary.  Soundproofing means you need a ROOM WITHIN A ROOM (some sort of that effect)

It's like your walls should be like this MASSIVE MATERIAL/AIR/MASSIVE MATERIAL, but most pro studios prefer using some diffusing material like rockwool or fiberglass in between the walls.

Soundproofing is not something you should just do yourself.  Research first before you spend.  Ask a consultant to design your room if you can.  Or hire an experienced contractor.  Better spend a bit more with a pro than spend inefficiently because you have to fix a bad installation.

Lastly, consider your needs.  If you really are THAT serious (meaning you wanna hit the drums as late as 2AM and or rehearse with a full-band setup in the wee hours) or if you are pissing mom and dad for being too loud then maybe soundproofing maybe your best choice.  If not, better save money for something else... mahal po mag sound proof fyi.

Offline mikep

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Re: Sound Proof a Concrete Room
« Reply #6 on: November 14, 2006, 07:27:12 PM »
 A hollow block wall would give you an STC of only about 47.  If your drumset is giving about 100 dB, you still have about 53 dB to contend with.  That is still pretty loud.  That is the reason why you need to put additional walls with insulation and air gap.  But if you think you can live with the remaining sound seeping through, is negligible (you measure it with an SPL meter), then, it is okay even if you do not add, say gypsum walls as reinforcement.

Helmholtz resonators are bass traps, good to tame offending LF in the room, but are not meant as soundproofing agents.  Of course, by using absorptive materials, you bring up the NRC (noise reduction coefficient) of room, which adds to lessening the total SPL.  But putting additional walls and building a room within a room would be a better move.

BTW, glass fiber and rockwool are materials not used for diffusion.  They are absorbers.  You put them inside walls to prevent resonance. You put them outside walls (the inside of the room) to absorb reflections or reverberation.  You can use them as diffusion if you alternate them with various acoustical materials in a wall, i.e., absorptive - reflective - absorptive - reflective, etc.


FWIW
« Last Edit: November 14, 2006, 07:44:47 PM by mikep »
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Offline KitC

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Re: Sound Proof a Concrete Room
« Reply #7 on: November 14, 2006, 09:52:27 PM »
OT:  :-D Helmholtz... I was thinking Heimlick.  :oops:  Carry on!
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