Forums | Home Repair | Home Improvement | Painting | Interior Decorating | Remodeling | Landscaping


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Drywall & Plaster

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 08-09-2010, 03:47 PM   #1
Member
 
Join Date: Mar 2009
Posts: 108
Share |
Default

acoustic drywall


Guys - looking for some feedback...

Am about to re-drywall a room. One of the common walls will have a TV mounted on the other side, and Tv speakers. To do that particular length of wall will be two sheets of drywall. Questions:

1. Does accoustic drywall on one side of a wall make a big difference for sound insulation vs. a 5/8 drywall on a 2x4 frame with insulation in the wall?

2. What's a typical cost of an accoustic sheet, i assume it's more then regular, but significantly more? A 8x4x5/8 sheet of reg. costs just under $7 out my way, what should i expect to pay for accoustic roughly?

3. Any difference in hanging/mudding/tapping accoustic vs. regular drywall?

thanks much!!
-Matt
mmhendrie is offline   Reply With Quote
Old 08-12-2010, 11:30 AM   #2
Newbie
 
Join Date: Jul 2010
Location: Windsor, Ontario Canada
Posts: 9
Default

acoustic drywall


The only acoustic drywall i have seen so far, is super expensive. I have had pretty remarkable results using a product called sonopan with a combination of resilient channel and sound batt insulation. their website explains how to use it with resilient channel and the STC (sound transmission class) rating it has. the site is very informative about building a sound proof room.

http://www.materiauxspecl.com/en/acoustic.html and click on installation and warning .pdf file.

good luck..........
Bjamin is offline   Reply With Quote
Old 08-12-2010, 12:46 PM   #3
Totally screwed together
 
Join Date: Dec 2006
Location: Cypress, SoCal
Posts: 325
Default

acoustic drywall


4x8 sheet of 5/8" accustic drywall is $35 at Lowes near me. I used it in a space where I didn't have alot of room to lose depth (a hallway). Two sheets of 5/8 and a tube of Green Glue will do you better.

Also, accustic drywall has an inner layer with a gummy adhesive - it's two 1/4" sheets glued together. This makes scoring and snapping impossible, because it now has two sheets of cardboard in the center that hinge instead of snapping. To cut this stuff, you actually need to CUT over 1/2way through the board before you can snap it off. Plus it will gum up your cutting tool.

Last edited by xxPaulCPxx; 08-12-2010 at 12:49 PM.
xxPaulCPxx is offline   Reply With Quote
Old 09-21-2010, 10:38 AM   #4
Soundproofing Guy
 
Join Date: Jun 2009
Location: Michigan
Posts: 235
Default

acoustic drywall


As Paul said, any pre-damped drywall is simply layers of standard boards and damping compound. There is simply no mystery to the materials. So the decision to use these pre-damped boards comes down to:

Price (less is better)
Mass (more is better)
Damping (more is better)

Generally you will always be able to field assemble a more massive, more damped and less expensive panel. An additional plus is that field assembly will allow you to overlap seams between the drywall layers.

Sonopan is another variant of sound board, and really has less value in sound isolated construction than you might think.

These sound board products are marketed under many different names. In general they are made from waste material from the lumber industry.

They are light weight and a bit spongy, so the hope of some sound isolation benefit springs forth.

Let's look at the physics of what is available to us in out little soundproofing toolbox. There are 4 and only 4 elements of soundproofing:

#1 we have Decoupling. Having these sound boards on our studs doesn't reduce the surface area of contact, not does it establish the required decoupled mass-air(spring)-mass system we're looking for. So these sound boards do not decouple.

#2 we have Absorption. For absorption within a defined air cavity we want a medium density absorptive material. Sound boards are far too dense for the type of absorption we need so in effect, sound boards do not offer absorption.

#3 we have Mass. The low density of the sound boards certainly don't replace drywall as they are at best 1/2 the weight of proper 5/5" drywall. Sound boards do not offer significant mass.

#4 we have Damping. While the soundboards may be somewhat damped themselves, they do not significantly damp the drywall they are in contact with. Sound boards do not effectively damp what they are in contact with.

So the sound boards find themselves in an undefined category. They arguably do a little but not to the point where we would take up valuable resources to incorporate them.

Ted White is offline   Reply With Quote
Old 09-22-2010, 04:16 PM   #5
Member
 
Join Date: Sep 2010
Location: Georgia
Posts: 61
Default

acoustic drywall


there is a very good product out called QuietRock which I use in home theater rooms, bsmt ceilings where the owner wants no noise coming from upstairs, most drywall supply places sell it, it can get expewnsive if you use a lot of it but for small jobs its worth the $$$.
newfie49 is offline   Reply With Quote
Old 09-22-2010, 04:24 PM   #6
Soundproofing Guy
 
Join Date: Jun 2009
Location: Michigan
Posts: 235
Default

acoustic drywall


I guess I would not agree that pre-damped drywall is worth the cost. Using standard drywall and one of several available damping compounds, you can create a much more massive and damped board in the field, as I mentioned in my last post.

More mass
More damping
Less cost

Also, the use of a damped drywall is only part of the equation. Again as mentioned in my last post

Last edited by Ted White; 09-24-2010 at 10:16 AM.
Ted White is offline   Reply With Quote
Old 09-24-2010, 10:12 AM   #7
Newbie
 
Join Date: Aug 2010
Posts: 11
Default

acoustic drywall


you can always get some lighter, cheap drywall and sandwich some of that green glue in-between. I've also heard about hanging a second layer of light drywall using few screws but mostly liquid nails...sound travels through screws/nails. I have not tried this though, so I can't necessarily recommend it.
jlberkeley is offline   Reply With Quote
Old 09-24-2010, 10:15 AM   #8
Soundproofing Guy
 
Join Date: Jun 2009
Location: Michigan
Posts: 235
Default

acoustic drywall


The best solution always includes a great deal of mass (weight), so double 5/8" is significantly better than double 1/2".

If the drywall panels are damped, screws become your friend. Liquid nails instead of screws is risky...
Ted White is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Matching new drywall to old textured drywall pennshaq Drywall & Plaster 1 05-23-2010 09:30 AM
Problem Patching Large Drywall Hole FuLLTiLT Drywall & Plaster 5 11-21-2009 09:42 PM
Old ceiling replacement idsp General DIY Discussions 12 07-25-2009 10:48 AM
What Thickness Drywall To Install Over Acoustic Ceiling? dsq Drywall & Plaster 12 02-08-2009 07:27 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.