Green Glue - Page 3

Dennis,
In your opinion, would the combination of GG & RISC be overkill? Or would GG provide significant isolation, with RISC providing only marginal enhancement? Or visa versa?

Many thanks,
Bob

Bob, in HT there is no such thing as overkill

I suppose not - certainly there's not such thing as over thinking!

Spoken by a fella, who like me, has come up short and has had a gallon of "whatever" save his ass.

One gallon sizes and five gallon buckets are perfect volumes for the application at hand.

I know it was asked earlier, but I didn't see an answer: What is the shelf life of Green Glue?

Thanks.

for wet glue: shelf life is at least several months, currently test samples have aged 9 months without issue, we guarantee 6 months for all current material

Great product. Looks like the option for me. I have a small room 11x16x9 and using RSIC clips will rob me of precious space. My concerns are long term performance. How is this product going to be performing 5 years, 10 years, etc..from the day it was installed ?

Regards,


Ivan

good question, Ivan

our lab has, from another source, a sample of this type of polymer that is 20 years old (stored indoors, no light) and it's in fine shape

heat aging tests are excellent, and every reasonable effort has been made to further stabilize the stuff, so...

i guess the best way to know what it will be like in 10 years is to wait 10 years, but it should last decades

Thanks, Brian !!

Ivan

Hi-

I am in the planning stages and intesively researching HT construction. I have a concern with sound traveling through the ceiling, but I also have a concern with reducing the ceiling height. Do you really need to 5/8 pieces of drywall to benefit from GG or can you just put a 1/4 layer on top? Will GG eliminate the need to insulate between floors? I was planning on using batting to dampen sound. How much of a benefit will I get from just using one piece of drywall, but adding GG on the joists?

Thanks,

Tweakophyte:

Have you been to http://www.audioalloy.com ? Lots to read there.

For example with your question
There's Green Glue On A Budget which talks about the change in damping using 50% of the surface area. You might be able to extrapolate the effects for just the joists since the joists on 16" centers would represent 9% of the surface area.

I would think there would still be a benefit to doing GG between layers no matter the thickness (within reason). However, the additional mass offered by an extra 3/8" drywall (5/8 instead of 1/4) is a great isolation benefit compared to 3/8" loss of ceiling height.

the use of 1/4" drywall with 5/8" or 1/2" instead of two thick layers is interesting. we will have concrete answers to that in one week it should work fine, biggest difference being a bit of lost mass.

I'm wondering about this exact thing for a project I'm currently working on. Any verdict on this?

Ed B. 1979:

RSIC decouples the gypsum from the studs, increasing TL, including the first impact.
Green Glue damps the resonant vibrations within the gypsum faster than gypsum alone, affecting both TL and in-the-room sound.
Seems to me that decoupling (RSIC or double stud wall) would work best in concert with Green Glue.

Hi all,

I'm really interested to see the effect of green glue in an objective comparison with other walls.

Not the traditional worst case wall versus whatever.

This should be usefull information.
I've seen now the damping curves on the related site.

If the idea is to apply it in practice comparisons should be made with practical solutions in a wall itself.

Just a thought. Or are such TL curves published already?

Kin,d regards
Eric Desart

Eric Desart:

http://www.audioalloy.com/green_glue.htm says "data for transmission loss, impact noise" are coming soon. Presumably that will be 3rd party lab data.

Is Green Glue a substitute for sand in the stage and riser?

Skip

Not a substitute for sand in the stage no. It is not required in the seating platform.

hi all,

those interested in small sizes: it's under discussion!

eric: i thought we chatted about this once? lol it should be lots of fun!

stages: we're close to wrapping up a research project on this topic - on stages with Green Glue. What we are assessing is vibration transfer to the floor/slab with a variety of vibration sources.

take care all and happy monday

Brian

It would be nice to have some choices for different sizes. Especially when the cost is a factor. Why waste two gallons of Green Glue if you don't have to?

BTW, as soon as I get back from vacation, expect a call from me.

Are there any known health risks to green glue? Asbestos was a wonder product when it came out as well. I would just like to know a little more info on what it is made out of before I coat the inner walls of my entire theater with it. Also how does green glue react when burned? Are toxic fumes produced?

hi Chris,

those are very good questions. it is a waterborne, latex-based product, and as such whatever safety precautions apply to normal latex paint should be applied here as well.

in combustion it, like all things, can generate smoke, carbon monoxide, etc. I am not aware, nor are the makers of any raw mateials, of any accute or specific danger of burning Green Glue.

it's waterborne material, handle it will all thusly applicable precautions.

Brian

Wow this is great news! I hope the discount lasts for a while, as I won't framing for a few months.

I will be building in the basement. I have forced air duct hanging from the ceiling/joists. I will need to frame around this duct work. the framing will have to be beefy enough to hold 2 layers of sheetrock. should I apply some goo to the framing members (between member and joist)? or just apply to the surfaces that will touch the sheetrock?

I'm planning a three layer wall sandwiching 1/2" homasote between two layers of 5/8" blueboard. Should I use GG on both sides of the homasote?

Is this a 3 db improvement, or more?

Also, is GG a good idea between subfloors in the room above?

Couple of more questions. From what I've pieced together even in a room within a room or RSIC type scenario, green glue will help because it help dissipate the low frequency vibrations better than normal. Hence less resonant problems.

In my situation I'll have an air cavity in between drywall and concrete so resonation is a big issue. Would green glue between layers of dry wall AND a layer rolled onto the concrete be superior over simply putting it in between the drywall?

hi Ken, the homasote (or other soundboard) + Green Glue is an interesting question, and one we're in the process of looking at. damping results should be available soon for a variety of 3-layer structures, including the one you mention, i'll relay when available. I don't know how expensive soundboard is in your area, but a central drywall layer may be heavier & cheaper

Hi Ed, you can damp thick concrete with Green Glue, but just putting a layer on top won't do much. It's what's called a "constrained layer" damping matrial, and functions when used as the center of a sandwich. NO paint-on damping material anywhere, now or ever, will meaningfully raise the damping of thick concrete at anything resembling a reasonable cost. (that's just an inherent drawback of paint-on damping - inability to affect resonance in thick, stiff things)

if you wished to damp concrete you could create a sandwich of concrete/Green/plaster, i'll make sure that data finds it's way onto the site ASAP as well (things are busy in there parts, lol)

i'll be back with another thought on the concrete + air cavity issue later this week

take care all and thanks for all the posts

Brian

"it is a waterborne, latex-based product, and as such whatever safety precautions apply to normal latex paint should be applied here as well."

Any test by independent laboratories on the horizon to verify safety and non-toxicity of product?

hi Frank,

well, as you've never seen a study for toxicity of a latex paint you'd find at home depot, etc., you probably won't find one for Green Glue. Top of my head i'm not aware of that type of study being available for any (specific, individual) commercial product of this type (latex), if you can find one let me know, but i'd be surprised. Go to HD and ask for a specific study on some formulation or color (each color presents a slightly different toxicological profile).

Toxicity of products like these is assessed via analysis of the components. (a put cyanide in a latex paint and there is cause for concern. we opted to skip the cyanide (heehee)

the material may be handled like a latex paint (wise to use gloves, not eat the stuff, and all the other things you'd do with a latex).

hope that helped

Brian

whatever it's worth, the process of UL testing and attainment of a "Green" listing are underway