tiling over in floor radiant heat

2538 Views 3 Replies 3 Participants Last post by Laura E, Apr 1, 2009

Laura E

Discussion Starter · #1 · Mar 30, 2009

My system is pex installed below the floor between the floor joists. I am getting ready to install finished floors, and have heard that there may be steps needed different from tiling or hardwood floors over a 'non-heated' floor due to the expansion and contraction resulting from the in floor heating. I generally install Durock over the subfloor, and tile on top of that, but it has been mentioned to me that I'll need a? crack isolation membrane to protect the finished project.

Any help would be great.

Thanks
Laura E

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R&D Tile

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Joined Feb 6, 2006

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335 Posts

#2 · Mar 30, 2009

What do you have for a subfloor now?

Yes, a membrane such as Ditra is a good idea to use over the heating system, no durock needed if this is used.

Bud Cline

· Tileguy

Joined Mar 12, 2006

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10,718 Posts

#3 · Mar 30, 2009

Flexible thinsets are also available for such installations.

Laura E

· Registered

Joined Mar 30, 2009

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2 Posts

Discussion Starter · #4 · Apr 1, 2009

For subfloors: we have 3/4 osb on half of the area, and 3/4 plywood on the the other half

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