Customer Reviews for CeraZorb® Insulating Synthetic Cork Underlayment (2’ x 2’) - 12 Sheets / 48 sq.ft.

19 Reviews

Just enough insulation from slab.

Kelly C., Biloxi, MS

Product minimizes heat loss from concrete slab on cold days. Product was grouted down first and then the element rolled out. Great at minimizing thickness of completed floor!

February 25, 2019

Liliana, Eldon, MO

February 17, 2019

Works surprisingly well

Andrea B., Brattleboro, VT

I'll admit, when this arrived I was doubtful that it would do anything - it's pretty thin. But halfway through the CeraZorb underlayment installation on the basement floor, we could feel it working - definitely blocked the chill coming through the concrete! I'm certain this will keep the radiant floor heating in the room where it belongs, and not seeping down into the concrete below.

February 01, 2019

Daniel R., Nogales, AZ

January 30, 2019

Ron L., Albert Lea, MN

August 13, 2017

Great product


Great product, fast shipping

May 14, 2017

Great product


Great product, would highly recommend if you are putting a heated floor over a concrete basement floor. They are pricey though if you need a lot.

February 03, 2017

Great Protection and Resistance

Mike T., Fishers, IN

This product was easy to install and added great protection and resistance between the slab an the heated floor.

January 08, 2017

I will be using this system on all future jobs


Great product with exceptional customer service. I will be using this system on all future jobs.

November 03, 2016

Very impressed


Very impressed with the insulation value of these tiles especially for being only 5 mm thick.

September 07, 2016

Miriam N., Brooklyn, NY

June 10, 2016

Robert G., NEW YORK, NY

June 05, 2016



This product is great. My radiant flooring grid would not have worked AT ALL if I hadn't used your CeraZorb mats. I tested the insulation properties by standing barefoot on my cold concrete floor. Then I stood on your product & the difference was AMAZING. I felt absolutely NONE of the coldness of the concrete. Thank you for coming up with this underlayment!

April 18, 2016

Quick warmth!

Kathie S., Punta Gorda, FL

I'm sure the cork is in large part responsible for my tile floor warming up so quickly!

April 16, 2016

Excellent product. Easy to use and seems to work very well.

Cathy R., Stoughton, WI

Excellent product.

April 16, 2016

Even before we laid the heat mat the floor was warmer...

Vickie T., Eveleth, MN

Even before we laid the heat mat the floor was warmer to walk on with this installed

February 13, 2013

Excellent product

Chris, Riverview, NB

Excellent product for use under electric radiant heat on concrete slab. Great service as well.

February 06, 2013

Great product

Millenia C., Millbrae, CA

Great product

December 18, 2012

Performed up to all expectations

John O., Seven Valleys, PA

The synthetic cork Cerazorb product installed easily and provides a great base for the heating mats. \Our installation was over a concrete slab and the Cerazorb allows for quick heating and longer heat retention. It has performed up to all expectations. I would recommend it to anyone installing basement floor heating.

February 14, 2012