Aquaflex Eliminates the Need for an Acoustic Underlayment

Aquaflex Performs to Attenuate Sound!

Performance on par with many noise reduction underlayments

Results are in on the acoustic studies conducted by Intertek. The testing was conducted on a 6” concrete slab w/ ceiling assembly. We ran both the ASTM E90 (STC) and ASTM E492 (IIC) test protocols. TAJ provided the Select Planks/Royal Maple 3mm, 6” x 36” plank for testing. Our results were surprising considering we used the CBD trowel which is a 9/64” U-notch spread compared to typical LVT adhesives using a 1/32” sq notch spread (almost 2X the glue). Our results prove that Aquaflex adhesive, by itself, will attenuate sound in both ASTM protocols comparable to systems of acoustical underlayment with adhesive. More importantly our values exceed the IBC Code 2006 for noise abatement.


Sound Transmission Class (STC) is an ASTM E90 measurement of the amount of sound transmitted through the floor. (Like the noise from an upstairs TV)

Impact Insulation Class (IIC) is an ASTM E492 measurement of the amount of sound transferred by impact to the floor. (Like the sound from high heels)

Type of Sound GeneratedSTC required to make inaudible
Normal speech30-35
Loud speech40-45

Legal and Practical Code Requirements

Section 1207 of International Building Code 2006 states that separation between dwelling units and between dwelling units and public and service areas must achieve STC 50 and IIC 50 for both air and structure-borne sound.

Test Results:

Installation of LVT over 6” concrete slab with ceiling assembly

LVT w/ conventional adhesivew/o underlayment25-3035-40
LVT w/ Iso-Step Floor Underlayment2mm, recycled rubber (Acoustical Solutions)0.466350
LVT w/ Armstrong Quiet comfort1mm, Polypropylene foam with poly film0.666264
LVT w/ SolidWalk LT- Fiber MB3.2mm, synthetic fiber blend with poly film0.455458
LVT w/ TrafficMASTER Acoustical3.2mm, synthetic fiber with poly film0.505460
LVT w/ The Silencer LVT1.5mm, high density Polyurethane foam with poly film0.696873
LVT w/ attached corkCOREtec Plus – 8mm total thickness (1.5mm cork)3.996262
LVT w/ AquaflexAquaflex adhesive using CBD notch trowel6257

Aquaflex, is not only the sole installation system supplied:

  • Waterproof
  • SILICA-Free
  • Complete
  • Warranted for the ‘Life of the Floor’
  • Warranted Against Failure to Topical Water
  • Bio-based, LEED, CHPS (01350), Zero VOC and GREEN

But, serves additionally as a NOISE Abatement Strategy!