WallDamp™

Self-adhesive Damping Material for Drywall

WallDamp is a self-adhesive sound and vibration damping material. When applied between studs, joists, drywall, and plywood of residential construction projects it produces calm rooms and a quiet home, reminiscent of a good old lath and plaster home.

WallDamp

It comes in the form of a 1mm thick sheet of constrained layer damping material, supplied in 4”x4” squares and 1½” x 4’ strips. It is covered with high strength double sided adhesive protected by release paper to ensure a lifetime of dependable performance.

Strips are applied between wall studs/drywall and floor joists/drywall. Squares are applied between first/second layers of drywall. WallDamp is also applied to metal stud/drywall in office construction and resilient channel/drywall for soundproofing.

In today’s home construction and remodel projects WallDamp additionally addresses the sound and vibration intrusion caused by high power sound systems being used in home theater, high fi listening room, and home recording studio spaces. Combined with the preference for large open spaces in modern home design and remodel, WallDamp restores the much-needed privacy between rooms in the home.

Applications

  • Listening Rooms
  • Home Theater
  • Recording Studios
  • Soundproofing

Installation Instructions

Here are a few examples of incorporating WallDamp with common wall constructions. Read WallDamp Installation Instructions »

How It Works

ASC-WallDamp is a constrained layer damping system, which means it works when it is glued between surfaces. Just remove the release paper from one side of a WallDamp strip or square and press it into position. Remove the next layer of release paper and press the adjoining material against the WallDamp adhesive and screw it down as usual.

WallDamp is a solid sheet of constrained layer damping material. The damping coefficient for constrained layer damping depends on the thickness of the damping compound: Too thin, it becomes too stiff and if too thick, it becomes too soft. Unlike liquid damping compound, WallDamp can’t be squeezed out of the narrow space between stud/joist faces and drywall by the pressure when sheetrock screws are tightened down which means WallDamp maintains its engineered damping factor.

WallDamp virtually eliminates wall vibration as shown in the two diagrams below:
Acoustic wall sealing

Here we have two walls, both are made of 8’ wood studs covered with 1 layer drywall both sides. We thump both walls at the midpoint with a rubber mallet and watch the vibration of the wall. On the left is the vibration of a standard wall construction, such as found in any residential wall and we see the wall vibration lasts about 1 second. On the right we see the same wall construction except with Walldamp between the stud and drywall. and observe the vibration of the wall lasts about 1 second. To the right we see the same stud wall has been constructed with WallDamp between the stud and the drywall and the wall vibration dies out in about ¼ second, 4 times faster. But count the wall vibrations: Undamped 35 vibrations and damped 5 vibrations.

WallDamp not only calms walls down but it blocks the conduction of sound through the walls.

1. Blocks Sound Conduction

Add WallDamp between the stud/joist and drywall to block the conduction of sound the stud of the wall and add sound-absorbing insulation in the wall cavity to help absorb the conduction of sound through the air between the studs. WallDamp weighs 1/3rd the density of steel. Because of the difference in material density WallDamp reflects sound and because of its absorption properties, it absorbs sound being conducted between one side of the wall to the other.

2. Eliminates Sound Transmission

Add WallDamp between studs and drywall to dampen the otherwise free vibration of the drywall that is suspended between the studs. Ever knock on the wall to find the stud? That hollow sound between studs is the bending vibration of the drywall and is what transmits sound through the wall. WallDamp on the stud face is distorted by this vibration action and absorbs energy out of the vibration. Add Walldamp between adjacent layers of double drywall to dramatically dampen drywall vibration.

3. Eliminates Wall and Ceiling Shudder

A wall shudders when people walk across the wood floor or close a door. The ceiling shudders from overhead footfall. But when the subwoofer of a home theater or hi fi set is playing, the walls, ceiling, and even the floor will be set into sympathetic vibration. That’s why people in other parts of the house or even next door “turn the bass down”. Adding WallDamp between studs/joists and drywall and between adjacent layers of drywall absorb the energy of vibration and virtually eliminate wall shudder.

 

 

 

 

 

 

Experiments

It is helpful to learn more about these three types of sounds: Wall conduction, vibration and shudder. They can be easily stimulated in any wall. Here are a few experiments to help with the understanding.

Sound Conduction

First experiment. To hear the conduction of sound through a wall, scratch on one side of the wall and listen with your ear up against the other side of the wall. What you hear is the conduction of sound through the wall.

One way to do this is to stand in an open doorway, put your ear against the wall on one side and reach around the door to the other side and scratch the opposite side of the wall. Or, have someone stand on the other side of a wall and scratch the surface, lightly with a pin or fingernails. Put your ear to the opposite side of the wall and listen. The scratching noise you hear is due to the conduction of sound through the structure of the wall. The sound starts in the surface of the drywall on one side, it passes through the drywall into the stud and then into the drywall on the opposite side of the wall. WallDamp between the wallboard and the framing greatly reduce the conduction of sound through the wall.

Wall Vibration

Here's another experiment. Make your fist as if you are going to knock on a door. Instead, knock on the wall. Walk slowly down the wall, knocking on it and listen to how it sounds. This is how you knock on a wall to find a stud. Where the sound seems hollow and louder is halfway between the studs, where the drywall is free to vibrate, twang back and forth. Where the wall sounds dull is when you are knocking right on top of the stud and the middle section of the suspended drywall is not being vibrated.

When WallDamp is sandwiched between studs and the drywall the hollow twang of drywall is damped out and the wall begins to sound more like an old, lath and plaster wall. Adding WallDamp between two layers of drywall dramatically reduces the hollow wall twang.

Wall Shudder

The last experiment. Make your fist tight as if you were going to thump it on a table. Notice the hard thickness at the heel of your fist. Walk along the wall and thump middle, about halfway up with the tight heel of your fist. That low boom you hear is due to structural vibration of the whole wall. Wall shudder is caused when the upper and lower edge of the wall is pinned at the plates while the relatively unsupported mid-section of the whole wall is easily caused to vibrate to and fro and give off the sound of a shudder. WallDamp sandwiched between the wallboard and framing damps out the wall shudder effect.

ASC-WallDamp improves the soundproofing of any wall in three distinct ways with one simple application. Adding WallDamp strips between the wallboard and the framing glues the wallboard to the framing and then damps out sound conduction, vibration and wall shudder, resulting in a calm and peaceful sounding wall and house.

Technical

Fire Rating (pdf)

ASC-WallDamp is a construction material that is an add-on or upgrade to standard wall and ceiling construction projects. By locating WallDamp material between the joints in a frame construction project, the rooms in the building take on that solid feeling of lath-and-plaster. With WallDamp in place, any vibration or sonic energy that finds itself inside the walls of the building is quickly removed, before it can be heard. This means that lightweight, cost effective stick frame and gypsum board walls can now provide the performance of much more expensive and heavy construction methods. Another important feature is that the WallDamp construction method uses standard construction materials and practices with the simple addition of a thin sheet of damping material that is slipped into every joint possible.

  • What is WallDamp?
  • WallDamp Construction Method
  • How Does WallDamp Actually Work?
  • How Does WallDamp Extract Energy From the Walls?
  • Engineering Report - WallDamp in Sheer Walls

Prices

To estimate how much WallDamp you will require use these tools:

 

SoundProofing and Sound Conditioning

WallDamp Squares 4″ x 4″ x 1/20″ (25 per bundle) $34
WallDamp Strips 1.5″ x 48″ x 1/20″ (100 lf per bundle) $126
WallDamp Strips 1″ x 48″ x 1/20″ (100 lf per bundle) $105