Insulayment Multi-Purpose Acoustical Underlayment

  • Ideal for glue-down, nail-down and ceramic tile flooring
  • Underlayment is a superior sound barrier
  • Flooring underlayment resistant to mold and mildew growth
100 Sq Ft3'x3.33'INSUL100 360 Sq Ft6'x60'INSUL360


Sound Reduction

Sound Reduction

Absorbs sound, keeps it from traveling to other rooms. Also help to make the wood floor feel more solid underfoot.

Glue Down Flooring

Glue Down Flooring

The recycled fiber composition provides excellent bonding strength with adhesives and thin set mortars.

Nail Down Flooring

Nail Down Flooring

Not recommended where flooring is less than 3/8" thick or less than 3" wide.

Smoothing Out Imperfections

Smoothing Out Imperfections

This cushion is firm and supportive but flexible enough to form around subfloor surface roughness, helping to cut down on extra surface prepping time

Insulating Value

Insulating Value

Provides additional comfort to the entire home during seasonal temperature changes.

Made From Recycled Material

Made From Recycled Material

A patented manufacturing process repurposes post-industrial and pre- and post-consumer materials into high-performance underlayment.

Certified Clean and Safe Indoor Air Quality

Certified Clean and Safe Indoor Air Quality

No VOC's (Volatile Organic Compounds) or off-gassing from materials.

Customer Questions

View All Questions

Thank you for reaching out. You need to use a Latex Portland thinset that conforms to ANSI A118.4

Latex Modified thinsets and epoxy grout are approved with Insulayment.

No this cannot be used under sheet vinyl.

Thank you for reaching out. We have heard about customers using it in this manner and have had good luck. However, that is not an approved application and we have no testing data to back anything u

Thank you for reaching out. The correct layer organization would be to put the QuietWarmth down on the substrate, install the insulayment over the QuietWarmth, then install the tile.

Thank you for reaching out. For our full installation instructions, please visit the link below.

Thank you for reaching out. We have never tested with that type of flooring and unfortunately there would be no warranty with that install.


Leave Review
by Ali1 - Lowe's Review

Easy to use underlayment

Good quality, made with recycled fibers, easy to use. Clear instructions, but in English only. Cuts easily with a sharp utility knife.

by Ryan B. - Amazon Review

Added benefit.

by Robert - Home Depot Review

This is a very high quality dense underlayment and works...

This is a very high quality dense underlayment and works amazingly to control heat loss and noise transfer . basemen

Sound Rating Test


Impact Insulation Class (IIC)Sound transmission through the floor.


Sound Transmission Class (STC)Airborne sound transmission through a partition.


Delta IIC (IIC)Sound transmission difference between a concrete subfloor with and without flooring.

* The higher the number, the better the noise control!

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