CeraZorb® Insulating Synthetic Cork Underlayment (4′ x 4′) – Pack of 25 Sheets

Brand: Warmlyyours

$800.00 $760.00

CeraZorb® Insulating Synthetic Cork Underlayment (4’ x 4’) – Pack of 25 sheets


SKU: CZRG-SH5MM-48X48-P25 Categories: ,


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 2’ 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.

Twenty-five 4’ x 4’ sheets provides 400 sq. ft. of coverage and is great for medium sized projects. Typically ships in 1 box.


Insulation Specification

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
R-value 1.5

Product Dimensions

Coverage 400 sqft
Length 4′
Thickness 0.187″
Weight 27.5 lbs
Width 4′

Warranty / Certifications

TCNA Robinson test Light Commercial
Warranty 5 years



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