Acoustic board material

[Jake]

Ive just ordered a case of Green Glue from a different shop in Brisbane. Only $25 a tube thank you very much.

Also got 7 sheets of Soundchek on the way. Looking forward to completing this job next week.

Cheers,

Jake

[Gee Emm]

lamtran - you need to seel the door - speak with your hvac contractor re letting air flow in - hvac is a serious issue for soundproofing and can undermine a perfectly built room if not done correctly

I agree

Sound travels very easily through air gaps

ANY gap will undo all the other hard work

Lamtran if you have to have an airgap, can you seal the door and face the gap away from the rest of the house eg ceiling, floor space, exterior walls?

Graham

[Guest Peter the Greek]

Raven accoustic seals or doorsealsaustralia.com.au

[Guest Peter the Greek]

Ive just ordered a case of Green Glue from a different shop in Brisbane. Only $25 a tube thank you very much.

Also got 7 sheets of Soundchek on the way. Looking forward to completing this job next week.

Cheers,

Jake

Mind sharing where you got it?

[Jake]

Mind sharing where you got it?

Not at all.

http://www.boughen.com.au/products/Green_Glue-418-14.html

[Guest]

Hi Jake

Are covering all the walls in the room .

Cheers

[Jake]

Hi Jake

Are covering all the walls in the room .

Cheers

Gday Mal,

No, I'm actually doing an entire wall's worth of inbuilt cupboards (lining inside the existing structure) between the main bedroom and new nursery (baby due in 4 weeks!), and also doing 1 wall of the music room that faces the street. All in all about 6m wide and 2.4m high.

But I'm also wondering why nobody has used Green glue in a speaker construction yet. So with the leftover I may use it in a SW cabinet. Make a double-thickness cabinet with GG in the sandwich.

Cheers,

Jake

[Grumpy]

But I'm also wondering why nobody has used Green glue in a speaker construction yet. So with the leftover I may use it in a SW cabinet. Make a double-thickness cabinet with GG in the sandwich.

Cheers,

Jake

Can't wait to read your thoughts on this Green stuff Jake. Saw it on some show last year and of course the brain starts ticking - bit expensive though isn't it?

[Guest]

But I'm also wondering why nobody has used Green glue in a speaker construction yet. So with the leftover I may use it in a SW cabinet. Make a double-thickness cabinet with GG in the sandwich.

Cheers,

Jake

It has been done but I don't think by anyone on this forum Andrew Steel built a CLD cabinet using the Green Glue .The good thing about the green glue it can be compressed down to 0.5mm and still dry .Theres a few other companys who make a similar product but they need about 2mm and moisture in the air to dry .

I bought 18mm Baltic Birch Ply to make my cabs using GG and the CLD construction ,I was going to glue the sheets first then do all the cutting .

Hope all goes well in 4 weeks time ,get plenty of sleep now.

Cheers

Mal

[lamtran]

I agree

Sound travels very easily through air gaps

ANY gap will undo all the other hard work

Lamtran if you have to have an airgap, can you seal the door and face the gap away from the rest of the house eg ceiling, floor space, exterior walls?

Graham

Thanks for the advice guys, will have to figure out what to do now. But I must have an airgap for the ducted aircon to work properly. Might make an air tunnel... hmmmm..

[Guest Peter the Greek]

Not at all.

http://www.boughen.com.au/products/Green_Glue-418-14.html

Thanks for that - I'm ages away from needing it for our current room, its good to find other local suppliers. It was going to be cheaper for me to have 2 tubs of the stuff plus the speed loader fedex'ed from the US (about US$1000) then buy the euqivalent in tubes here (4 cases)

[AnthonyG]

I am very curious about Green Glue. At $17/m^2 supply price it is way more expensive than another layer of 13mm Soundchek ($13/m^2). The greengluecompany website would have us believe that it is way more effective but I don't think the company has done a proper cost-for-cost comparison.

A typical studio wall might look like this:

3xplasterboard - large airgap with cavity infill and independent studs - 3xplasterboard.

The Green Glue alternative would be:

2xplasterboard with GG - large airgap with cavity infill and independent studs - 2xplasterboard with GG

To me it looks like the Green Glue wall is around the same cost to build but would have worse mass-air-mass resonance frequency (perhaps a better damped resonance though).

Also, there are no tests like that one on the greenglue web site - all the tests are done with a single row of studs. The comparisons shown on the web site should extrapolate from single studs to double studs but maybe not. Also the lab they have used is a bit annoying - it is not a proper full size acoustic lab (which would be 200m^3 rooms, 10m^2 walls) - and it has flanking issues at moderate-high values of wall performance.

I want to believe but really I want to see the cost-comparisons of an actual studio-type wall first.

[Guest Peter the Greek]

Its used by the very best in the industry and the is a ton of research to back it up - it works, your concern is over value, you'll have to decide that for yourself. Damping is however an important component in soundproofing effectively. Not as much as isolation though. Mass has diminishing returns.

[AnthonyG]

My point is that the research is all on single-stud walls, not on double stud walls. Single stud walls are what ppl use in houses, double stud walls are what are used to build studios. I have no quibble with whether the product works or not - that seems quite clear. What is less clear is exactly how well it works in a studio wall and what the cost-effectiveness is of this compared to other options. My other point is that the acoustic lab they have used is not really suitable as it has flanking issues when trying to test high-performance walls. I haven't seen test results from any other labs, even though I believe these tests have been done. From a technical POV it is just a bit frustrating.

Re your other point, you will note that damping also has diminishing returns - the GreenGlue company clearly states that one tube per plasterboard sheet is about 2/3 the effectiveness of two tubes and that 3 tubes is "optimal" for acoustic performance. However, 2 tubes seems to be the recommended dose as 3 would be much less cost effective.

[Ted White]

Anthony is right, and reasonably cautious. You can't assume that a product's performance in wall X will be the same in wall Y.

Transmission Loss testing (ASTM E-90) on two comparable staggered stud walls show an 11 STC point improvement. 10dB improvement in TL at 80Hz. compared to standard staggered wall. 19dB at 2000Hz. (damped coincidence point of the drywall)