Soundproofing 101




SOUNDPROOFING CARPET UNDERLAY

Our collection of durable, effective Carpet Underlayments combine the noise-blocking effects of a Soundproofing Barrier with an impact-absorbing layer of premium soundproofing foam.

Proven to work in applications just like yours.

When selecting a product, consider the traffic level, the condition of the sub-floor and whether the product you choose is specifically designed for floors.

  • If the area to be treated is a high-traffic location, a hallway or public facility, you must use a product that contains closed-cell foam under the Soundproofing Barrier layer; open-cell foam will not last under heavy use.
  • You will need our help in determining if you have an STC or IIC problem, each one requires different consideration; they are not the same thing.
  • You must be aware of the conditions below the sub-floor to ensure that the problem will be fixed with an underlayment product only. We can fix the ceiling below also. Please refer to our Soundproof Ceilings for further information.
  • Finally, make sure that the product you select is specifically designed for floors. Soundproofing Barrier alone will not work, nor will more layers of plywood. Adding standard building materials is not a reliable method for isolating floors.

Premium Underlayment

For your most demanding applications, we can combine foam layers as thick as 1/2” with a barrier layer of 1/4” to create a premium performance product. Adding 2 lbs sq/ft of weight insures maximum privacy. Our typical uses for this product are recording studios, commercial spaces, high-end residential and luxury yacht staterooms.

Ultimate Underlayment

Manufactured entirely of recycled rubber, Privacy Ultimate Underlayment adds 2 lbs sq/ft of weight in only 1/2” and provides superior wear resistance for any carpet. An added carpet pad is sometimes needed for residential when a luxury carpet is to be installed.

Performance Underlayment

For most applications our 1/4” premium foam, combined with a 1/8” Soundproofing Barrier layer will provide superb results. At 1 lbs sq/ft Performance Carpet Underlayment will add measurable privacy to your home. Instead of a carpet pad, Performance Underlayment is 3/8” thick, perfect for most carpet installations.


UnderlayTotal SizeFoam SizeWeightSTC
Premium3/4” thick1/2” thick2 lbs sq/ft32
Ultimate*1/2” thickn/a2 lbs sq/ft32
Performance3/8” thick1/4” thick1 lbs sq/ft27
  • Do you have questions?
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    With Sound Isolation Company you will get the help you need: expert design, product selection and installation instruction. We have the experience you need for a partnership that will work.

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  • Our soundproofing products and materials are in stock and ready to ship today from 10 different distributor locations.

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