CeraZorb® Insulating Synthetic Cork Underlayment (2’ x 4’) - 1 Sheet
CeraZorb Underlayment Description
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.
This 2’ x 4’ sheet is pre-cut and works well for either tight spaces or large areas. Minimum order of 4 sheets required.
|Acoustic testing on 6" slab, no ceiling||IIC 52 wood construction. FIIC 59 - 7.5" concrete slab. ΔIIC 20 - 6" concrete slab|
|Compressive Strength||34 psi @ 10% Deformation|
|Shipping Height||0.167 in|
|Shipping Length||48 in|
|Shipping Weight||0.7 lbs|
|Shipping Width||24 in|
Warranty / Certifications
|TCNA Robinson test||Light Commercial|
CeraZorb Underlayment achieved an average rating of 4.9 stars with 19 reviews by our customers.
Just enough insulation from slab.
Kelly C., Biloxi, MS on 02/25/2019
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!
Liliana, Eldon, MO on 02/17/2019
Works surprisingly well
Andrea B., Brattleboro, VT on 02/01/2019
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.
Daniel R., Nogales, AZ on 01/30/2019
Ron L., Albert Lea, MN on 08/13/2017
CNR G., PASSAIC, NJ on 05/14/2017
Great product, fast shipping
Tim O., 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
Mike T., 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
Bruce A., WOODCLIFF LAKE, NJ on 11/03/2016
Great product with exceptional customer service. I will be using this system on all future jobs.
Graeme H., EDMONTON, AB on 09/07/2016
Very impressed with the insulation value of these tiles especially for being only 5 mm thick.