View our Product FAQ for answers to common questions about Green Glue Compound.
Damping compounds, like Green Glue Noiseproofing Compound, are relatively recent advancements in the sound isolation market. Green Glue Compound is a material that is applied between two layers of solid non-porous material, typically drywall or wood, in walls, ceilings, floors, isolation boxes, window plugs, and doors.
Green Glue Compound is most often applied from tubes, instead of pails, in smaller projects that might be done in phases and to help track of the amount of Green Glue Compound applied on a project. The cost for Green Glue Compound in tubes is about 20 cents per square foot more than in the five gallon pails.
To learn more about how damping products work, read our article Concept of Damping.
Green Glue Compound can be used in most wall types including wood framing, steel stud framing in staggered stud walls, double stud walls, and walls with resilient clips or resilient channel installed. Concrete and cinder block walls will not respond well to Green Glue Compound because they are too heavy and not resilient enough. The addition of Green Glue Compound to a standard wall (applying Green Glue Compound to a new layer of drywall and fastening through the existing drywall into the framing) will increase the isolation level to a point where loud voices, television, and phones ringing are typically fully isolated.
Ceilings are heavier and less resilient than walls, so they require more significant efforts to isolate sound transmission. The addition of Green Glue Compound to your ceiling between two layers of drywall will add some benefit, but often not enough to satisfy expectations, especially for performance relating to impact footfall noise. To gain the full benefits of Green Glue Compound in your ceiling, we recommend first installing a resilient sound clip system or resilient channel. Green Glue Compound, on a resilient system, will increase isolation for both impact footfall and airborne noise by about 7 IIC and 6 STC points.
Similar to ceilings, Green Glue Compound is best installed in resilient assemblies. If your ceiling below is suspended from resilient sound clips or resilient channel, then the Green Glue Compound will add about 7 IIC and 6 STC points to the assembly rating. Green Glue Compound is also valuable in floors when used beneath rubber underlayment or in layering beneath or above the GenieMat RST (layering uses layers of rigid materials such as plywood or Hardibacker).
ON STUDS OR JOISTS
Applying Green Glue Compound directly to the studs or joists before the first layer of drywall will not help with the isolation performance of your assembly.
DISSIPATION OVER DISTANCE
The performance of a product is often only considered in terms of STC results from acoustic lab testing. Flanking sound transfer cannot be properly tested in an acoustics lab. If the material or structure has low damping, the sound vibrations can travel from material to material for great distances. If a structure has high damping, then the vibration is dissipated quickly and cannot travel throughout the structure with ease. Because of this, damping products like Green Glue Compound are vastly more crucial than lab tests show. Even in high STC assemblies (decoupled assemblies), the Green Glue Compound will have considerable value in reducing the strength of the vibrations that do pass through the assembly keeping those vibrations from traveling throughout the structure.