- What is Green Glue & how does it work?
- How does constrained layer damping work?
- How is Green Glue applied?
- Can I use Green Glue with only one layer of drywall?
- Do I use nails or screws in conjunction with Green Glue?
- Should I use conventional adhesive along with Green Glue?
- How thick is the Green Glue layer?
- Can Green Glue be used in floors?
- Can I treat just the ceiling, or should all surfaces be dealt with?
- Can Green Glue make a high performance wall without decoupling?
- Can Green Glue be used in conjunction with decoupling techniques?
- Will Green Glue perform even better in between drywall and soundboard?
- How does Green Glue compare to other techniques?
- Is Green Glue toxic?
- Is Green Glue a fire hazard?
- How much does Green Glue cost?
- How much do I need?
- I need to soundproof on a budget, how can I reduce the cost of a Green Glue room?
1. What is Green Glue and how does it work?
Sound travels as
a wave through the air. It's an airborne vibration. The waves hit a
wall or ceiling and the energy becomes structure-borne. Unless the wall
or ceiling material is damped, the vibration will travel through the
building framing and exit somewhere else as sound again.
2. How does Green Glue Work?
In a constrained
layer damping system, sometimes referred to as CLD, a damping material
is sandwiched between two other (usually stiff/rigid) materials. For
example, Green Glue
sandwiched between two layers of drywall. Damping occurs when the viscoelastic center of the "sandwich" is sheared (see below).
When bent, shear
forces pull and stretch on the damping material. Under these
conditions, the unique polymeric construction of Green Glue very
efficiently converts this mechanical energy to heat. The vibration
energy is not isolated, it's dissipated and gone.
3. How is it applied?
Green Glue comes
in 29 oz. tubes. You can use any quart size caulk gun, available at
most hardware and building material stores. It is very fast and easy to
apply. No special skills whatsoever are required. Application
Instructions.
4. Can I use Green Glue with only one layer of drywall?
No. Green glue
needs to be a constrained layer, meaning that Green Glue is sandwiched
between to rigid, dense layers of building material. There is no limit
to how many drywall / Green Glue layers you can utilize, and performance
will improve as the # of layers goes up. You can save valuable $$$ by
using slightly less Green Glue in each damping layer if your walls are
to have more than 2 layers of drywall. For floors, you can use any
common materials (cement board, OSB, plywood, etc.)
5. Do I use nails or screws in conjunction with Green Glue?
Yes. Audio Alloy
recommends the use of screws in accordance with local building codes.
Screws assist with the compression of the Green Glue layer into a thin
film.
6. Should I use conventional adhesive along with Green Glue?
No. The presence of rigid, low-damping materials alongside Green Glue between layers is not desirable.
7. How thick is the Green Glue layer?
About 0.5 mm.
8. Can Green Glue be used in floors?
Absolutely, in
fact when used in floors, Green Glue yields a double benefit - it helps
with both impact (footstep) noise and airborne sound, and is very
effective at both. Green Glue may be used between layers of subfloor,
between subfloor and tile backer board, and between thinset mortar and
the surfaces below. You may be able to use 2 layers of thinner subfloor
if convenient.
9. Can I treat just the ceiling, or should all surfaces be dealt with?
If you have a
situation where you want, for example, to stop sound from moving
upstairs, the most logical path for the sound is through the
floor/ceiling into the room above, this is called the direct path.
However, sound can make its way upstairs through the walls (or even
floor) as well in the form of mechanical vibration. Sound in your room
vibrates the walls, this vibration makes its way up where it creates
sound by vibrating the surfaces of the upstairs room. Sound making its
way through these indirect paths is called flanking noise.
An analogy that
is sometimes used when discussing sound isolation is that of an
aquarium. If your aquarium has a hole in any of the 5 sides, then the
water can spill into the floor, regardless of how tight the other 4 are.
The same applies to sound.
For best
results, you should consider treating all the surfaces of your room. You
may also have to pay attention to other sound paths, such as noise
going in and out of doors, and noise making its way through ductwork.
Read more about how sound can travel along non-linear paths.
10. Can GG make a high performance wall without decoupling methods such as resilient channel?
Yes, without a doubt. In fact, Green Glue has performance advantages in many applications relative to some decoupling schemes.
11. Can Green Glue be used in conjunction with decoupling techniques?
Yes, and better
performance can be had. For walls the preferred decoupling methods are
double studs > staggered studs > modern sound clips > resilient
channel. For applications where low frequency isolation is important,
resilient channel is not recommended.
12. Will Green Glue perform even better in between drywall and soundboard?
No. Soundboard is far lighter than drywall and isn't preferable in any ceiling or wall assembly.
13. How does Green Glue compare to other techniques?
We have same-lab, 3rd party data answering this question directly. See our technology page for the details.
14. Is Green Glue toxic?
No. Green Glue
is water based, non-toxic, non-carcinogenic, and very low in VOC
(<5grams per liter / compliant in all 50 states and worldwide). As
with all products, paints, glues, and so forth, you should use proper
precautions and read the MSDS before using Green Glue. Green Glue has a
mild odor, typical of latex products. This odor is not dangerous and
will dissipate completely given time.
15. Is Green Glue a fire hazard?
No. Green Glue has been fire tested, and can be utilized in fire-rated walls without affecting the rating of the wall.
16. How much does Green Glue cost?
About 80 cents
per square foot, making a layer of Green the most economical sound
isolation product around, as well as one of the best.
17. How much do I need?
Recommended
application is 2 tubes of Green Glue per 4' x 8' area - 2 tubes per
standard sheet of drywall. If you are not on a budget, utilizing 3 tubes
per sheet will improve performance. Each case of Green covers about 192
square feet, or 128 square feet if used at the 3 tubes coverage rate.
Do not use more than 3 tubes per 4' x 8' sheet as performance will
actually decline above 3 tubes per sheet. You are just wasting your
money!
18. I need to soundproof on a budget, how can I reduce the cost of a Green Glue room?
Wonderfully,
Green Glue performs at an only slightly lower level if you use it at
1.5 or even 1 tube per sheet instead of the recommended 2. about 70% of
the raw damping performance is retained when using 1 tube per sheet, 3rd
party tests coming soon. In fact, Green Glue can improve performance if
used at even less than 1 tube per sheet.
0