CeraZorb Underlayment


CeraZorb Underlayment

Starting from $70.00 59 Reviews


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  • 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

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 12 and 20 sheets, respectively. CeraZorb is a synthetic cork underlayment system that is specifically designed for setting tile and stone and is an excellent insulation choice under our TempZone™ and Environ™ electric radiant floor-heating products. CeraZorb is a very resilient underlayment with compressive strength of 34 psi at 10% deformation. 

CeraZorb comes with a 5-year limited warranty.

Customer Questions & Answers

CeraZorb Underlayment has 29 Questions and Answers.

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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.

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What type of flooring can I install along with an electric floor heating system?

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.

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How do I know if I am installing my electric floor heating system properly?

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.

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How do I figure out how much underlayment I’ll need for my floor heating project?

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. 

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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.

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Customer Reviews

CeraZorb Underlayment achieved an average rating of 4.8 stars with 59 reviews by our customers.

Great customer service

Peter M., Oak Ridge, NJ on 07/08/2022

Great customer service

Caring staff

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

Great service

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.

Pedro is AWESOME!

Anonymous, Lake Zurich, IL on 10/21/2021

Pedro has been EXTREMELY knowledgeable and helpful to design and quote my order. My requirements changed multiple times and Pedro every single time worked with the engineering team to update the designs promptly. It took a long time for me to finally place the order, but i never felt rushed, and every single question i had was perfectly answered and addressed. When it comes to customer order and customer success, it does not get any better than that. Thank you Pedro!

Great product Great service

Rand M., New Rochelle, NY on 09/08/2021

I work with Mary and she is extremely knowledgeable and pleasant to work with. On top of that the products are top of the line and easy to work with. The assistance they supply (which is hardly needed) is outstanding. I would highly recommend WarmlyYours product.

Excellent service and support

Amit V., Lake Zurich, IL on 07/21/2021

Couldn't have asked for better service. Jennifer worked with me on my project, right from the very first quote and while a lot of things changed through the course of the project, I had excellent support all along, accommodating all the changes and providing prompt support all along. Even with returns that I had to make unfortunately, Jennifer and the team were fully understanding and prompt with the transactions. One of those rare companies that seem to value customer satisfaction more than just making money on each customer in the short run. I plan to install heating in other rooms in the near future and I will undoubtedly make the first call to Jennifer at WarmlyYours.

WarmlyYours-The name says it all

Larry S., Granby, CT on 06/05/2021

Outstanding! WarmlyYours.com has an excellent website. Qualified personnel assisted on the telephone. Ordering was easy and product arrived as promised. Installation instructions are excellent and the product is very easy to work with. The most important is - yes the floors are warm.

Warm Feet

Anonymous, Lakeville, NY on 05/16/2021

Everything went well and according to the plan!!! Thank you for all the help.

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