Sound Proof ceiling...?

andrelaplume2July 12, 2014

I have a 14 by 20 1st floor family room with hardwood floors. FYI we sit at the far side of the room. Directly underneath is a 12 x 18 section of basement finally being finished. The joists have fg insulation in place. There is one metal duct run covered in fg as well.

The wife and kids would like another tv down here...on the far side of the room right under where I sit to upstairs to watch my tv! I set a radio there at a normal listening volume. Sure enough the sound can easily be heard thru the floor upstairs.

My question is what if anything can be done to eliminate or lessen he noise and at what cost?

I see home depot sells ROXIL sound proofing stuff. I could put it on top of the fg in the joists on the far end of the room where the tv would be. It would get expensive to do the whole area. However, the package says it for steel studs in side walls.

I could put in a better Armstrong ceiling than I was planning on (drywall is out). The ceiling I had picked said it blocked 45% of noise. The better one says it blocks 70%. Of course it costs twice as much?

What do you think?...or am I simply fighting a losing battle?

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grubby_AZ

Knowing that sound proofing is impossible, you still have two tools available. One is decoupling, or breaking the path of sound transmission. Rugs do this. Suspended ceilings do it too. Flexible mounts to separate drywall from studs is another way, not in a floor but perhaps in a ceiling.

The other tool is mass. Cramming lots of insulation into joist space helps. Layers of paper board like homasote works well between joists if cut tightly, hold in with drywall nails and use spray foam to seal gaps.

Mass in respect to sheet goods' resonant frequencies lead to another layer of drywall on a ceiling being especially good if the two drywall layers are of different thicknesses, and even gooder with three layers, the middle one being a third different thickness of rock or perhaps a layer of homasote, OSB, plywood, or hardieboard. These layers could be hidden behind a decorative ceiling. This sort of layering is very effective.

And be sure to never buy your kid a drum kit unless you first build a guest house.

    Bookmark   July 12, 2014 at 7:08PM
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andrelaplume2

We are beyond the drum set stage! I don't want drywall in the area. I have a dropped ceiling in the other part of my basement....there are rugs above it. I guess I can see how much a difference it makes by moving the radio. Having rugs in the upper family room is not an option though. I think a lot of the sound is coming from the darn metal duct anyway!

Anyone know about the roxil sound stuff...is it only meant for side walls in steel studs?

    Bookmark   July 12, 2014 at 7:52PM
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worthy

As noted above, mass or isolation. Or both.

Unfortunately, whatever you do, flanking transmission--that is, through the wall /floor junction will still carry enough apparent sound at certain frequencies to virtually cancel out improvements to the ceiling.

I once tore down the ceiling of a finished basement apartment to fill the joist space with Roxul. Not the slightest detectable difference. (Maybe an instrument would register a bit.) Ditto fiberglass.

Two layers of drywall on resilient channels would theoretically help. However, in practice, just one or two screws too long will short out the benefits.

Your best bet would be Quietrockor equivalent or Green Glue.

Table from City of Vancouver Noise Control Manual

This post was edited by worthy on Sat, Jul 12, 14 at 20:05

    Bookmark   July 12, 2014 at 7:53PM
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andrelaplume2

thanks worthy, I did not want to waste $$ on Roxul if it would not work. I need a dropped ceiling here..oh well...

    Bookmark   July 14, 2014 at 12:51AM
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pprioroh

In the main part of our basement we have suspended ceiling acoustic tiles then 10" or so of fiberglass (filled in the entire joist space) and then subfloor / felt paper, and hardwood on floor up top - we don't hear TV downstairs at all.

On the more extreme end, we built a noise - isolated home theater with extra wall mass, green glue products and suspended/isolated walls with 4 layers total of drywall, it's possible in that room with multiple large subwoofers and reference range sound to have a LOUD movie going and hear nothing upstairs where the same system in my last home (with standard construction) would literally rattle stuff on the dressers two floors up. So you have to adjust your sound "proofing" according to the level (and TYPE) of noise being generated.

Sound flanking is absolutely critical so placing insulation just in a few spots will likely do very little.

    Bookmark   July 15, 2014 at 2:27PM
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andrelaplume2

mine will likely be akin to your first home...so maybe the ceiling tile will help. It seems right now, to my ear upstairs that the sound is mostly coming from a heat/ac register in the floor. Its already covered with insulation...maybe I can put more around it.

    Bookmark   July 16, 2014 at 10:22AM
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andrelaplume2

Question...I do not want to drywall the ceiling area here however do you think drywalling just the area immediately above where the tv will be would make a difference...I'd have my joists, one with a duct for heat/ac) , fg insulation then drywall then my dropped ceiling in this area...?

    Bookmark   July 18, 2014 at 12:52PM
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pprioroh

No it will make no difference- sound flanking is very real.

    Bookmark   July 18, 2014 at 1:59PM
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