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Serenity Ultimate Underlay™: Thickness 9mm(3/8") , Roll 4 ft x 25 ft
Serenity Ultimate Underlay™: Thickness 9mm(3/8") , Roll 4 ft x 25 ft
Serenity Ultimate Underlay™: Thickness 9mm(3/8') , Roll 4 ft x 25 ft
Item Id: 77-9-25
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Serenity Ultimate Underlay

Luxury noise control and soundproofing under carpet, tile, and hardwood floors is now available with just one product. You will experience the ULTIMATE in peace and quiet from noise above and below, without the cost and inconvenience of tearing up your current floor. Serenity Ultimate Underlay has been designed to provide unequaled performance in preventing sound from traveling through floors. Made in the USA from 93% recycled rubber, our soundproofing carpet underlay will provide valuable LEED points to your project.


The weight of the underlay determines how much sound blocking the floor will have. The thicker the underlay, the more sound reduction will occur. When working with installs on wood framing and lightweight concrete the 11.5mm padding is the most ideal treatment.

Nailed down hardwood floors
When wood floor is nailed down to the sub floor with hundreds of nails there are 100s of paths for sound to propagate through the flooring. These physical connections are the source of footstep vibration traveling to the room below.
Serenity Ultimate Underlay isolates a new layer of plywood from the existing plywood sub floor. This allows the flooring to be nailed to a sub floor, but the nails do not reach the floor framing, preventing the sound from moving from level to level.

Floated wood floors
When working with floated or glued down wood floor
Serenity Ultimate Underlay can be rolled out and the flooring can be installed directly on top of the underlayment.

Stone and tile floors

When  Stone and tile floors require a thinner version of Serenity Ultimate Underlay, so that the stone or tile is not subject to cracking and breaking around the corners. The 6.4mm thickness is recommended and should provide significant sound reduction for stone and tile floors.

 Privacy Ultimate Underlay is available in four thicknesses 3.2mm, 6.4mm, 9mm and 11.5mm. When additional low frequency noise blocking is required we suggest the 11.5mm thickness which will add 28% more mass and insure that heavy bass noise will be significantly defeated. 
Frequency (Hz)125250500100020004000STC
Performance Carpet Underlay16172329343727
Ultimate Carpet Underlay17212533384332
Premium Carpet Underlay19222734384332
Type:Privacy Ultimate Carpet Underlay
  • Proven and Reliable Reduction for footsteps and airborne noise
  • Made in the USA from 93% Post Consumer Recycled Rubber
  • Remarkable peace and quiet from only one product
Thickness:9mm (.354")
11.5mm (.453")
Weight:9mm (1.5 lb per sq/ft)
11.5mm (2 lb per sq/ft)
Roll Size:4.5' x 25' (100 sq. ft.)


Installing Privacy Ultimate Underlay requires no outside assistance and can be completed with the help of our installation manual located below:

Installation Manual

For more about Privacy Ultimate Carpet Underlay details please reference our appropriate PDF's:

Installation Manual
Transmission Loss Tests