Mud Set Over Radiant Tubing [Archive] - Ceramic Tile Advice Forums - John Bridge Ceramic Tile


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08-03-2004, 10:21 AM
I am installing 3/8" radiant tube under a tile floor application. The tubing will be installed on a two layer plywood sub-floor. The architect is requiring a 1-3/4" - 2" thickness of mudset for the tile installation. Because of certain construction restrictions, we need to install the tubing now and would like to know if one layer of mud set approximately 1" can be applied to cover the tubing. Then after the interior is at a more finshed level (approximately 2 months from now), can the remaining 3/4" - 1" of mud set with tile be installed over the first layer of mud set? Are there any issues with the two layers bonding or using these thicknesses?

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08-03-2004, 01:36 PM
Sounds like a good job for the Schluter Becotec system. It's cheap, easy to deal with and adds thermal efficiency.

You will have to use the Ditra membrane over your mud bed though. That is a good thing anyway.
You can see an installation video at that link as well.

Here is a pic of one of our installations. We were using self leveling but it will work with deck mud too.

Good luck.


08-03-2004, 01:50 PM
Here's a close up............................

John Bridge
08-03-2004, 03:18 PM
Hi G, Welcome aboard. Pleas give us a first name. :)

The Bekotec system is ideal if you can afford the extra cost.

Back to the mud bed, two layers can be bonded together with thin set, but it's not really a great idea. I think you should wait to install the tubing. An inch of mortar over the tubes isn't going to hold up well during the course of construction. Deck mud is designed to be covered with tile immediately.