Questions about sound isolation in an exsisting room - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 5 Old 02-18-2012, 11:03 PM - Thread Starter
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I have been working on the design for my HT and have started to think about sound proofing and isolation. The space is above my (2) garage and the exterior is stucco on 3 walls. The back wall backs up to my (2) built in racks and a craft room wall. The room is 21 x 13.5 x 9. There are (6) can lights and (2) hvac supplies in the ceiling, no returns. It is open attic above the ceiling.

Keeping sound from reaching other parts of the house is not a big concern. We don't have kids and if we are using the space everyone in the house will be in the HT. From my reading I can see the advantages of keeping noise out of the room and keeping the noise floor down.

So from my attachments you can see that the room has already been sheet rocked with normal 1/2" material. The builder was not supposed to drywall this room but the crew did it anyway. I was hoping to not have to do a bunch of demo to get started. So my questions are:

1) Would it be a huge mistake to proceed from where the construction is now?

2) Will I see some benefit by placing GG and 5/8 drywall over my existing drywall. Would this be a suitable compromise?

3) If I need to pull it down and do staggered studs or clips I can but will it make a HUGE difference? I am really tight on space at 13-6" so the loss of width worries me as well.

Thanks for your help!!
LL
LL

The Moving Pictures Theater Construction Thread:
https://www.avsforum.com/t/1462881/th...ruction-thread

Houston GTG - Summer 2014
https://www.avsforum.com/forum/61-are...l#post26079610
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post #2 of 5 Old 02-20-2012, 12:18 PM
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How close are your neighbors? And how loud is your area overall? Any nearby major roads/highways/malls/airports/trains/etc?
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post #3 of 5 Old 02-20-2012, 04:20 PM - Thread Starter
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The houses are on big lots so they are not very close. No airport or major roads close by.

The Moving Pictures Theater Construction Thread:
https://www.avsforum.com/t/1462881/th...ruction-thread

Houston GTG - Summer 2014
https://www.avsforum.com/forum/61-are...l#post26079610
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post #4 of 5 Old 02-21-2012, 07:41 AM
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The reason I ask about neighbors is because sound falls off nonlinearly, so every extra foot helps. Here's a cool calculator:

http://www.sengpielaudio.com/calculator-distance.htm

Sound isolation is sometimes "better safe than sorry". Is your new neighbor going to have a finicky baby that naps 6 times a day? Or a crotchety old couple that hates bass?

I would focus on sealing those windows up first. Regarding extra drywall, try looking at greenglue.com they have lots of test data.

I sympathize with every inch counting in your case, so hopefully a compromise solution will work.
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post #5 of 5 Old 02-21-2012, 07:46 AM
 
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Here is a generic listing of downloadable documents available from the NRC on Isolation methods. The NRC is an excellent source of tested construction methods. Pay particular attention to the doc regarding flanking paths.

Be aware, EVERY part is required. You cannot fix part of the system and scrimp on another part and assume it is 'good enough'. It does NOT function that way. The system is Only as effective as the least effective component.

You must first determine exactly how much isolation you require: (max internal level in db SPL - maximum external level in dB SPL) = minimum amount of isolation required.

Owens Corning Design Guide
http://www.owenscorning.com/quietzon...esignGuide.pdf

NRC (National Research Council) docs (Choose the docs that are appropriate to the construction type):

Sound Transmission Loss Through Concrete and Concrete Masonry Walls
by Albert Litvin and Harold W. Belliston
www.cement.org/bookstore/profile.asp?itemid=RD066

Sound Transmission Loss of Masonry Walls
by Warnock and Monk
www.nrc-cnrc.gc.ca/obj/irc/doc/pubs/brn/brn217/brn217.pdf

Sound Transmission Loss Through Drywall and Block Walls
by Warnock
www.nrc-cnrc.gc.ca/obj/irc/doc/pubs/ir/ir586/ir586.pdf

Gypsum Board Walls: Transmission Loss Data
By Halliwell, R.E.; Nightingale, T.R.T.; Warnock, A.C.C.; Birta, J.A.
www.nrc-cnrc.gc.ca/obj/irc/doc/pubs/ir/ir761/ir761.pdf

Controlling Interoffice Sound Transmission Through a Suspended Ceiling
by R.E. Halliwell and J.D. Quirt
www.nrc-cnrc.gc.ca/obj/irc/doc/pubs/nrcc33097/nrcc33097.pdf

Flanking information:

System Details That Work (Leaks and Flanking)
by David Quirt
www.nrc-cnrc.gc.ca/obj/irc/doc/leaks-flanking.pdf

Guide for flanking sound transmission in wood framed construction - airborne sources
by Nightingale, T.; Quirt, J. D.; King, F.
http://www.nrc-cnrc.gc.ca/obj/irc/do.../nrcc49468.pdf

Controlling Interoffice Sound Transmission Through a Suspended Ceiling
by R.E. Halliwell and J.D. Quirt
www.nrc-cnrc.gc.ca/obj/irc/doc/pubs/nrcc33097/nrcc33097.pdf

Airborne Sound Insulation in Multi-Family Buildings
by J.D. Quirt and T.R.T. Nightingale
http://www.nrc-cnrc.gc.ca/obj/irc/doc/ctu-n66_eng.pdf
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