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Sound Insulation

Iamme said:
I think you mean per "square", don't you? A "square" is 100 square feet. (or a 10 x 10 area). 15 or 30 pounds would be an awful lot for tar paper felt to weigh for only one square yard I think.

Also, regarding Tyvek-like products: They are magical in the sence that not only do they sheet water (tar paper can do this), but, unlike tar paper, these products can "breathe".
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Yeah, I think you're right about the weight. I've been looking at sailcloth too much lately.

If tar paper was continuous, it would seal pretty well, but it's in 36" widths, so the framing and whatnot can breathe through the space between the layers. The only advantage I've really nailed down for Tyvek is it's 8+ foot width makes it go up much faster. Tyvek will also decompose under some wood sidings, like cedar.

did
 
(Diddidit)

Tyvek will also decompose under some wood sidings, like cedar.

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No kidding! Really? That sounds like...well, do they have a disclaimer or anything to get them out a legal haggle regarding this? That seems pretty strange. Reminds me of how I used WD-40 on my engine and front end parts and it melted the rubber bushings on my 66 vomit Comet, years ago. :(
 
My friend has decided to use single studs with fibro-cement sheets on both sides and thermal insulation in the cavity.

He says that if there is an effective, weatherproof, sound reflecting/absorbing material that can be attached onto the fibro-cement sheet facing the neighbour, he may consider it depending on cost.

In the mean time he is resigned to the fact that he will have to be happy just to block the neighbours view onto his deck.

I will be helping him do this on the Easter Weekend and will let you know how it turns out.


BillyJoe
 
With something that hard on the outside, there's no need for anything inside the wall, or not much of anything, really.

You will at least bounce some conversation, etc, away, and block the view.
 
jj said:
With something that hard on the outside, there's no need for anything inside the wall, or not much of anything, really.
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Are you saying that the insulation will have no effect over and above the effect of the cement sheets? He actually has a bag of insulation left over from doing his garage. Is it still not worth putting it in?

BillyJoe
 
BillyJoe said:
Are you saying that the insulation will have no effect over and above the effect of the cement sheets? He actually has a bag of insulation left over from doing his garage. Is it still not worth putting it in?

BillyJoe
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In this situation, 95% of the reflection if not more, comes from the hard outer layer.

The inner absorbtion might keep the think from working like a drum if somebody beats on it, but I doubt it will even do that effectively.

It won't hurt, but I doubt it will do much. Now, if the insulation was open to the air through a mostly-porous (i.e. cloth-like) something, it would do something, but with creteboard on both sides, it's not going to have much, if any, effect.
 
jj,

Thanks.

We plan to put the frame up tomorrow and on Monday the fibro-cement sheets.

My friend's sister-in-law is an artist and she is dead keen to paint a landscape on the surface facing onto the deck - all 15' x 9' of it. If it turns out I might get a pic to post here.

If the neighbour cooperates with sound reduction we might paint his side a nice natural green. Otherwise we might just leave it the ugly grey of the raw cement sheet or maybe get the kids to paint on some obnoxious graffiti. :D

bj
 
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