• STC ratings of 27-31
  • Standard roll size is 4' X 25'
  • Class A (or I) flammability rating per ASTM E-84

Purchase QuietLag

Soundown's Pipe and Duct Wrap / Laggings are multi-purpose composite materials manufactured and sold in 4' X 25' rolls. These products are available in several variations to solve your specific application requirements. The products feature a faced flexible acoustic mass barrier bonded to an insulating acoustic fiberglass decoupling layer.

  • Specify your choice of 1, 1.5 or 2 lb/sqft mass loaded vinyl (use the heavier barrier for low frequency noise attenualtion.)
  • Specify silver, grey or white reinforced protective finish.

The decoupling layer is bonded to the inside of the acoustic barrier to provide thermal and vibration insulation, it is available in 1" or 2" thicknesses;

  • Specify your decoupler choice of quilted 2 lb/cuft nominal density acoustic fibergalss or black 1.5 lb/cuft nominal density acoustic fiberglass (use the higher density for best attenuation results).

Application: Pipes and Ducts
Wrap noisy pipes, waste pipes, ducts, valves and fan housings to prevent break through noise from transmitting through the wall of the pipe or duct: measure the exterior diameter, add about 5" for overlap, cut that length from the 4' wide roll, wrap the lagging on, tape closed with duct tape or with matching Soundown mylar tape - repeat.

Suspended Ceilings
For privacy enhancement of acoustic suspended ceilings to prevent break through noise from transmitting through to the space above. Simply lay the lagging sheet on top of your ceiling panels* with the fiberglass side down. Precut 2'X4' panels are available to fit your ceiling grid for a fee.* Note: the installer must assess suitability of the ceiling grid and supports for adding additional weight.

Interior Walls of Home & Apartment HVAC Closets
Apply the lagging with fender washers and screws to the interior walls of apartment HVAC closets. To increase structureborne vibration dampening: substitute peel-n'-stick pressure sensitive adhesive to achieve full surface contact of the acoustic mass layer to your interior walls and then use the fender washers with screws. (Ask us about aspiration baffles for interior HVAC to achieve a tight, satisfactory job.)

Interior Machine Cabinets
Substitute peel-n'-stick pressure sensitive adhesive to achieve full surface contact of the acoustic mass layer to your machine cabinet interior surfaces. Die and CNC cutting is available for production orders.

Product Data:
1 to 2 lb/ft faced acoustic mass loaded vinyl barrier with / without bonded 2” nominal thickness fiberglass absorber / decoupler.

Nominal thickness --1" - 2”
Standard size --4’ x 25’
Weight --1.4 - 2.4 lb/ft 2
“R” Factor --Up to 8.0
Flammability --Smoke Density index 19.5, Flame spread index 12.5
Temperature range --20 deg F to + 350 deg F
STC --27-31
Soundown part number --IMT 10, IMT 15 or IMT 20 for 1 lb, 1.5 or 2 lb/sqft

Acoustical Data:

Products
Sound Transmission Loss (dB Frequency (Hz)
STC
125
250
500
1000
2000
4000
IMT10
15
15
24
30
35
38
27
IMT15
16
16
26
33
37
41
30
IMT20
20
20
28
35
39
44
31
  • Flexible, formable, versatile
  • STC rating 27-31
  • Available in custom cut sizes
  • Die cut and CNC volume cutting available

Physical Properties:

Product
Weight / mass
Thick-ness
Service Temp (f)
Tensile Strength (psi) ASTM D 412
Tear Strength ASTM D 624
Stiffness, MPA ASTM 749
Elongation ASTM D 412
R Rating
Barrier
LAG 10 (IMT 10)
1.4 (lbs/sqft)
1/8"
-40 to 255
407
77
19.6
120
n/a
LAG 15 (IMT 15)
1.9 (lbs/sqft)
3/16"
-40 to 255
LAG 20 (IMT 20)
2.4 (lbs/sqft)
1/4"
-40 to 255
Absorber / Decoupler
1" F'glass quilt
2 lb/cuft
1" nom
-40 to 350
-
-
-
-
4
2" F'glass quilt
2 lb/cuft
2" nom
-40 to 350
-
-
-
-
8
1"black F'glass
1.5 lb/cuft
1" nom
-40 to 350
-
-
-
-
4
2" black F'glass
1.5 lb/cuft
2" nom
-40 to 350
-
-
-
-
8

Flammability Properties:

LAG 10 (IMT 10)
Class A (I) ASTM E-84,
UL94: Meets VO
FMVSS-302: pass
LAG 15 (IMT 15)
Class A (I) ASTM E-84,
UL94: Meets VO
FMVSS-302: pass
LAG 20 (IMT 20)
Class A (I) ASTM E-84,
UL94: Meets VO
FMVSS-302: pass
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