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CeraZorb® Insulating Synthetic Cork Underlayment (4' x 4') - Pack of 100 Sheets

15 Reviews

CeraZorb® Insulating Synthetic Cork Underlayment (4' x 4') - Pack of 100 Sheets

15 Reviews

CeraZorb is a synthetic cork underlayment that is installed on top of a subfloor and below a heating element. It is recommended when installing an electric floor heating system over a concrete slab to prevent heat loss. By creating a thermal break, the heat is prevented from sinking into the concrete, and more heat radiates into the floor covering and room. In addition to preventing unnecessary heat loss, CeraZorb provides sound dampening benefits and double the crack isolation benefits when compared to cork.

CeraZorb is lightweight—up to 25 times lighter than traditional 1/4" backer board. It is available in 2’ x 4’ and 4’ x 4’ sheets, and in packs of up to 100. CeraZorb is a 5 mm. (roughly 3/16 in.) thick, synthetic cork underlayment system that is specifically designed for setting tile and stone and is an excellent insulation choice under our TempZone™ electric radiant floor-heating product. It’s a very resilient underlayment with compressive strength of 34 psi at 10% deformation. 

A hundred 4’ x 4’ sheets provides 1,600 sq. ft. of coverage and is great for multiple rooms or projects. Typically ships in 4 boxes. 



$3,840.00 Out Of Stock


Customer Reviews

TempZone™ Flex Rolls achieved an average rating of 5.0stars with 15 reviews by our customers.

, Albert Lea, MN on 08/13/2017

Great product
, PASSAIC, NJ on 05/14/2017

Great product, fast shipping

Great product
, BELLEVILLE, IL on 02/03/2017

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.

Great Protection and Resistance
, Fishers, IN on 01/08/2017

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

I will be using this system on all future jobs
, WOODCLIFF LAKE, NJ on 11/03/2016

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

Very impressed
, EDMONTON, AB on 09/07/2016

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

, Brooklyn, NY on 06/10/2016

, NEW YORK, NY on 06/05/2016

Amazing!
, AVERILL PARK, NY on 04/18/2016

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!

Quick warmth!
, Punta Gorda, FL on 04/16/2016

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

View all customer reviews