CeraZorb® Insulating Synthetic Cork Underlayment (4’ x 4’) - 320 sq.ft. - Pack of 20 Sheets
- Heat and cold resistant, and will not rot, support mold and mildew, or absorb moisture
- Stable and durable, remaining unchanged after repeated impact loads
- CeraZorb® has a 1.5 R-value, and it offers crack isolation of up to ¼”
- Lightweight, up to 25 times lighter than 1/4” backer board, and weighs in at only 28 lbs. per each 400 sq. ft. box
- Can be used under a wide range of floor coverings like tile, stone, LVT, and laminate and can be used over any acceptable subfloor
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. CeraZorb is a 6 mm. (less than 1/4 in.) thick, synthetic cork underlayment that is an excellent insulation choice under our TempZone™ or Environ™ electric radiant floor-heating products. It’s a very resilient underlayment with compressive strength of 34 psi at 10% deformation.
This 20-pack of 4’ x 4’ sheets provides approximately 320 sq. ft. of coverage.
|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|
|Thermal Insulation||1.5 R-Value|
Warranty / Certifications
|TCNA Robinson test||Light Commercial|
Customer Questions & Answers
CeraZorb Underlayment has 29 Questions and Answers.
How can I determine what I need for my floor heating project and how can I find out what my floor heating system will cost?
You can use the Instant Quote Tool, which gives you many options for your floor heating coverage. Use this interactive tool to design your room online and receive an instant quotation with product recommendations, rough-in and installation kits, cost of your control, etc. Planning your floor heating project is made easy when using our Instant Quote Tool.
Send us your floor plan or fax it to (800) 408-1100 and we will send you a quote, product recommendation and a free custom installation plan for your project.
WarmlyYours’ TempZone™ product is most commonly installed under tile, stone, and marble flooring, but can also be installed under many other popular floor covering options such as hardwood, vinyl and linoleum. We also have our Environ system, which is an electric floor heating product as well and is specially designed for installation under carpet (in the U.S. only), laminate and floating wood. WarmlyYours can accommodate any flooring type with either of the electric radiant floor heating products that we offer. If your flooring type isn't listed here, just give us a call at (800) 875-5285 and we will be happy to discuss it with you.
Please keep in mind that you must check your electric floor heating system with a digital ohmmeter in conjunction with a Circuit Check™. Take an initial reading as soon as you take the product out of the box to verify that it is within -5% / +10% of the values stated on the product’s label. This will give you a basis of comparison for future readings. Take a second reading once you have positioned the system to match your custom installation plan. It is also advisable to take an additional reading in the middle of the tile installation, just to make sure that the Circuit Check™ is doing its job. Then, take a final reading when you are finished with the floor installation and are ready to hook up the thermostat.
The Circuit Check™ is a tool developed by WarmlyYours to give you peace of mind and ensure trouble-free installations. Simply hook up the cold leads to the tool while you position the system to match your custom installation plan.
The Circuit Check™ will continuously monitor the continuity of the circuit during the installation of your system and during the installation of your flooring. The Circuit Check™ beeps immediately when a short in the system is detected, alerting you to a potentially damaged cable in the area you are working, before you lay the tile over the electric floor heating system. The WarmlyYours technical support team is available 24/7 to provide assistance if the alarm sounds, or if you would have any questions during your installation.
The best way is to use our Radiant Floor Heating Quote Builder tool. It’s a great way to get an estimation by simply providing project information like room size and subfloor type.
Should I add insulation before installing electric floor heating and how will that affect the system's performance?
When installing electric floor heating over a concrete slab, an insulating underlayment like CeraZorb is highly recommended to ensure efficient operation, faster heating times and warmer floor temperatures.
View all 29 Questions and Answers
CeraZorb Underlayment achieved an average rating of 5.0 stars with 5 reviews by our customers.
Great customer service
Peter M., Oak Ridge, NJ on 07/08/2022
Great customer service
Anonymous, Mt Pleasant, IA on 06/02/2022
They verified my order before I ordered the products so i got what I needed. Speedy delivery as well
Matt R., Lake Zurich, IL on 05/26/2022
I’ve been trying to find an easy way to warm up my son’s bedroom above garage, when I came across WarmlyYours. The radiant heating system was designed by WarmlyYours and installed underneath our new carpet. The whole process was great. We couldn’t be happier. It looks and works great. Thank you.
Great product great service
Bob C., Los Osos, CA on 03/16/2022
We have been working with WarmlyYours for over 20 years and they have provided great products and timely responses. They will service you well.
Great sales guy!
Pete S., Fitchburg, MA on 01/28/2022
Justin really went out of his way to get me what I needed in a timely manner. Very patient and knowledgeable guy.