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Foam Underlayments

Foam underlayments are an affordable underlayment option for use with most flooring types. Offers sound resistance with superb moisture resistance.


Shop our most popular foam underlayment options:


Combo Foam Underlayment

Standard: 2mm
IIC Rating: 51
STC Rating: 52
$0.38 /sqft

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Silent Silver 3-in-1

Standard: 3mm
IIC Rating: 72
STC Rating: 73
$0.52 /sqft

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Comfort Preferred

Standard: 7/16"
IIC Rating: -
STC Rating: -
$0.30 /sqft

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Want more options?       Shop All Underlayments »

Why Foam Underlayments?

Pros and Cons
  • Can be used under any floor.
  • Inexpensive underlay option.
  • Excellent moisture protection.
  • Mold and mildew resistant.
  • Is favorite under floating floors and carpet.
  • Reduces sound under laminates and hardwood floors.
  • Easy to install.
  • May not provide ideal sound resistance.
  • May allow telegraphing of sub floor.

Why Do I Need Underlayments?

Without and with Underlayment
Underlayment is an amazing invention created by the flooring gods out of necessity. Underlay has an impressive list of benefits, including: adding warmth to your floors so your feet aren’t so cold on new tile flooring, adding comfort and a slight ‘give’ underneath wood or vinyl floors, reduced sound transmission (great for houses with noisy teenagers!), as well as reducing in room step noise. This image is a very simplified example of using underlayment versus not using it, but as you can see the benefits greatly outweigh any reason not to.

IIC / STC Ratings

IIC/STC Ratings
IIC stands for Impact Insulation Class, which refers to impact sounds such as shoes hitting the ground, dropping a cell phone, or other scenarios where something it dropped or impacts the floor. STC stands for Sound Transmission Class, which refers to any audible noise (not an impact) such as music playing aloud, a conversation, or a loud television, for example. With both of these ratings systems, the higher the number rating is for the underlayment, the better it will suppress sound, and the quieter a room will be. You may want to pay close attention to these ratings when shopping for underlayment if sound reduction is important to you.

Sound Control Graph

Estimated Sound Control

Sound Control Graph

All About Underlay

Foam underlayment is the least expensive and the most popular flooring underlayment on the market. Foam is popular with carpet and floating floors and can be used under all flooring types. Easy to install , most foam underlays feature and attached moisture barrier. Foam underlayment is moisture resistant, but most floors are not. Foam offers very good sound resistance and help to reduce the 'hollow' sound that is typically heard under laminate and engineered hardwood floors. Foam underlayment can be found in roll and tile form.


Why use underlayment?
Underlayment is a great product solution that will work to help reduce impact noise like footsteps between floors of a building, as well as adding thermal properties and a little bit of cushion so that your tootsies stay comfortable on your new flooring.
Is noise really an issue?
There are two types of potential acoustical issues that you might face in a home or business: sound transmission between multiple rooms or floors, and room acoustics within a single room interior. Noise is a very important factor in a variety of spaces, such as in hotels, hospitals, multi level apartment complexes, homes with a quietly sleeping newborn, call centers, you get the point.
I don’t want a loud, echoey house. What is the best floor to reduce noise?
Consider how reflective the flooring surface will be. Harder, more rigid products such as tile, stone or hardwood will be more reflective than soft/fibrous floors.
What can I do to make it quieter once my flooring is installed?
If you have a hard surface flooring, to increase the effectiveness of impact sound reduction, you should consider adding an area rug or runners in hallways and spaces that receive a large amount of foot traffic. It really helps to think of sound reduction as a whole ‘system’ rather than simply a ‘one piece’ solution.
What are the ratings and what do they mean?
IIC, or Impact Insulation Class, is a rating of how well a floor-ceiling assembly lessens impact sounds or structure-borne sound transmission (think of noisy footsteps upstairs, or a dropped remote hitting the floor). This number can be significantly affected by the choice in a floor covering and/or an underlayment.
Example: carpet (an absorptive floor option) can help to absorb and lessen impact noises, compared to a tile floor (a reflective floor option) that is very hard and would hit loud and bounce the noise. More rigid materials will be less effective than soft, fibrous materials.
STC, or Sound transmission Class, is a rating of how well a wall or floor lessens airborne sound (think of a cranky teenager blasting their loud, angry music). STC rating numbers are minimally affected by a floor covering and/or an underlayment. (Time to think of building a soundproof room for those music sessions!)
NRC, or Noise Reduction Coefficient, is a measure of how absorptive a finish is, or how much sound is absorbed by a finish when the sound comes in contact with it. Smooth surfaces typically have a lower NRC rating (more ‘bounce’) and are not as absorptive as carpet, acoustic wall treatments, or ceiling panels. Think of the last time you were in the movie theater - it had carpeting and the fancy wall panels to absorb sound. This prevents the audio from bouncing around and becoming echoey.