QuietDown Acoustic Underlay


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Choose the right QuietDown for your application:

QuietDown Max

QuietDown Max

Proven and trusted by professionals and homeowners alike, QuietDown Max is the original underlay offering maximum sound insulation for floating floors and nail-down applications. Doubles as a durable 100% vapour barrier.

Made with Symar rubber
Made with Symar® rubber

Product Thickness Size Weight per Sheet
F032892mm (1/12")42" x 48"6.85 lbs.
F033243.2mm (1/8")42" x 48"10.70 lbs.
F036506mm (1/4")42" x 48"21.40 lbs.


QuietDown Max High Bond

QuietDown Max High Bond

The felted surface of QuietDown Max HB forms a solid bond with urethane adhesive and modified mortar. QuietDown Max HB is a 100% vapour barrier and is specially formulated for glue-down and tile/stone applications. Made for long-lasting strength.

Made with Symar rubber
Made with Symar® rubber

Product Thickness Size Weight per Sheet
F03289HB2.8mm (1/10")42" x 48"6.85 lbs.
F03475HB4mm (5/32")42" x 48"10.70 lbs.
F03458HB7mm (1/4")42" x 48"21.40 lbs.


QuietDown Premium

QuietDown Premium

Manufactured with granulated rubber, QuietDown Premium is an economical underlay that offers superior sound insulation performance compared to cork, bitumen, felts and foams. Offering up to 21 dB impact sound reduction, QuietDown Premium is mold and mildew resistant and will not degrade over time. It can be used under floor heat systems, and meets indoor air quality standards. Its bondable surface makes QuietDown Premium an ideal acoustic underlay for a variety of applications.

Product Thickness Size Weight per Sheet
QDRCU2MM2mm42" x 48"6.16 lbs.
QDRCU3MM3mm42" x 48"9.24 lbs.
QDRCU5MM5mm42" x 48"15.4 lbs.


Typical Floor Assemblies

Concrete slab with hardwoodWood joist with hardwood
Concrete slab with hardwood Wood joist with hardwood
Concrete slab with floating laminateWood joist with floating laminate
Concrete slab with floating laminate Wood joist with floating laminate
Concrete slab with tile or stoneWood joist with tile or stone
Concrete slab with tile or stone Wood joist with tile or stone
Concrete slab with engineered woodWood joist with engineered wood
Concrete slab with engineered wood Wood joist with engineered wood
Concrete slab with screedWood joist with screed
Concrete slab with screed Wood joist with screed

Note: The results contained herein were obtained from a representation of a typical batch of materials. Batch to batch variation is expected and is normal in the manufacturing process. KN Rubber LLC makes no representations nor warranties and there are no conditions with respect to the accuracy, reliability, or applications of the information contained herein, its products or the safety or suitability thereof, or results obtained, whether expressed or implied, including, without limitation, any implied warranty or merchantability or fitness for a particular purpose. Buyers and users must determine the results to be obtained from the application of the information herein and assume all risk, responsibility, and liability for all injuries, losses, or damages arising from the application of the information or use of KN Rubber's products, whether or not occasioned by KN Rubber's negligence or based on strict product liability. KN Rubber neither assumes, nor authorizes any person to assume for it, any liability in connection with the use of the information contained herein of its products.