Other Products - Floors

Barrier Materials for Floors

Barrier materials with decoupling layers or underlayments can be used to control floor to floor sound. In addition to reducing airbourne sound, the separated barriers help to reduce the sound energy that can get into the structure and travel to other parts of the building.
These treatments can be particularly useful in buildings and homes where ceilings are finished. It is a common way to control unwanted sound in multi-floor homes that are converted into separate apartments.

BM -1C is a barrier material within an attached foam decoupling layer that can be placed directly on the floor then covered with carpet. The barrier lays flat and does not need to be glued or fastened to the floor. The sound transmission loss that is a achieved is significant compared to other methods that usually require a great deal more mass in the assembly.

Plain barrier material like the 5 B-OB can be used in conjunction with Duracoustic underlayment. This combination increases transmission loss and provides impact isolation to reduce the sound of people walking or moving around overhead.

The Duracoustic is laid out on the floor with no installation requirements other than taping the seams. The 5 B-OB barrier is rolled out on top – perpendicular to the runs of Duracoustic ( seams also taped) carpet is installed directly over the decoupled barrier to complete the floor finish.

Iso Sep 25HD

The Iso Sep is a profiled rubber pad that provides a high degree of vibration isolation between building elements.


440 SoundBarrier® controls sound in floors, walls and ceilings.

Independently lab tested and time-proven in millions of square feet of residential and commercial structures, 440 SoundBarrier® is a special-density, structural board made from 100 percent environmental Homasote® cellulose fiber, a homogeneous composition manufactured with uniformly distributed protection against termites, rot and fungi and resistance to moisture. It also insulates, with twice the R-value of wood.

Carpenters and do-it-yourselfers can easily install 440 SoundBarrier® in room partitions and peripheral walls, ceilings and floors, in:

  • single or multi-family housing
  • high and low-rise apartments and condominiums
  • motels
  • schools
  • professional buildings
  • assisted living facilities

440 SoundBarrier's Advantages

  • Lightweight
  • Easy to handle, cut and shape
  • Widely available in convenient sizes
  • Ready to apply directly to framing
  • Provides excellent noise attenuation when installed as recommended
  • Provides excellent, moisture-resistant thermal insulation


ThicknessAvailable SizesWeight
1/2" 4' x 4', 4' x 8',
4' x 9', 4' x 10'
1.2 lb/sq. ft.
5/8" 4' x 8', 4' x 10' 1.5 lb/sq. ft.
3/4" 4' x 8' 1.8 lb/sq. ft.

Typical Physical Properties

Density: 26-28 lb./ft.3
Tensile, parallel to surface (min.): 450-700 psi
Transverse M.O.R. (min.): 750-1000 psi
Hardness, Janka Ball (min.): 230 lbs.
Water absorption by volume (max.):
2 hrs. immersion
24 hrs. Immersion

Expansion from 50%-90%
relative humidity (max.):



Noise Reduction Coefficient: 0.20
Flame Spread: Class III (or C)

Floor/Ceiling Assemblies (UL L-500 Series) in which Homasote is Listed

L501 L502 L503 L504 L505
L506 L507 L508 L509 L510
L511 L512 L513 L514 L515
L516 L517 L518 L519 L520
L521 L522 L523 L524 L525
L526 L527 L528 L529 L532
L533 L534 L535 L536 L537
L538 L539 L540 L541 L542
L543 L544 L545 L546 L547
L548 L549 L550 L551 L552
L553 L555 L556 L559 L562