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Radiant Floor Heating/PEX in Litecrete membrane and tile

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Question
I have infloor heat installed (pex tubing) with litecrete over the top.  I am having porcelin and ceramic tile installed and need to know if I need to have a membrane material (ditra) under the tile to prevent cracking.

Answer
It never hurts to install a crack isolation membranes between any substrate and a new tile floor, especially when one considers the considerable investment you have already made in radiating the floor.

When high-end tile or marble floors are installed over our radiant floor panels we always specify a crack isolation membranes and would not argue against them in any case.

We have use crack isolation membranes by Noble and Ditra etc. They can be painted on or come in sheets. http://www.noblecompany.com/Products/SheetMembranes/tabid/58/Default.aspx?gclid=

Uncoupling two dissimilar materials always makes sense and will help control any crack that may develop.

By the way, properly designed and installed radiant floor or snow/ice melting systems do not add any undo stress to any flooring material.  

Radiant Floor Heating

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Morgan M. Audetat

Expertise

Radiant panel heating design, including floors and ceilings, European wall panels and snow melting for residential and light commercial buildings..............................................................-Master of Steam and Hot Water,City of Minneapolis....................................................--- Master Plumber, State of Minnesota...........

Experience

30 years..... Charter Board Member - Radiant Panel Association, former manufacturer of condensing boilers, former national distributor of radiant floor products, son and apprentice of mechanical & plumbing contractor. Current owner---www.BadgerRadiantDesigns.com---Minneapolis mechanical/plumbing contractor specializing in hydronic based, integrated HVAC systems. Radiant floor heating/cooling. Snow Melting. Condensing Boilers. Indirect water heaters. System design, consulting and technical training world-wide. Licensed contractor, designer, installer and consultant.

Education/Credentials
B.S. University WI 1981 CONTINUING EDUCATION: Viessmann Condensing boiler and Solar water heating certification 2010, N.D.S.U. Lead Worker RRP certification 2010, Knight condensing boiler certification 2009, Wrightsoft Manual J CAD certification 2009, RPA Designer & Installer Certification 2008, Nate Hydronic/Forced Air Certification 2008, Uponor/Wirsbo advanced design school certification 2007, Buderus Wall-hung certification 2007, Power Limited License (low voltage controls) 40 CE credits 2005, Basic Hydronic Certification IPEX & Northern Alberta Institute of Technology 1998, Charter Board Member - Radiant Panel Association 1994, Residential Off-Electric to Hydronic Conversion Heating School Canadian Hydronics Council 1994, B&G Little Red School House 1993, Rood Utilities (now Auburn Technical Institute) Oil Burner School 1993 ,Tekmar Controls residential and commercial 1993, Division Manager and Advanced Hydronic Seminar Instructor for the first Exclusively Hydronic Radiant Floor Distributor in the USA 1990, Hydronic Radiant Heating Association Workshop participant with Richard c. Bourne, PE spring 1988, Master Plumbing, Hydronic, Solar Course Red Rocks Community College 1987.

Awards and Honors
2009 System Showcase Award - Radiant Panel Association

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