Prep for tiling

brussoSeptember 24, 2011

My sunroom has 6 x 6 tiles which I want to replace. I pulled up a couple and dicovered that they have been installed on top of plywood 1/2 inch. There is a basement beneath the sunroom.I want to install larger tiles 18x 18. My question is how to prep the floor. The tiles seem to come up fairly easy but the glue is stuck to the floor in some cases. Do I need to scrape off all the glue? Can I tile on the plywood or should I install backerboard?? How thick backer? 1/4 or 1/2?

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1/2" plywood even with a backer board is not enough subfloor for tile. I would install 3/4" t&g and then 1/4" hardi board.

    Bookmark   September 25, 2011 at 8:31PM
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Sophie Wheeler

What size are your joists and how far do they span? How close together are they? Large format tile cannot stand any floor flex or it cracks. That's probably why the PO used the 6x6 tile. It's a lot more forgiving of floor deflection. A "sunroom" implies a structure that is already "lightly built" rather than built to normal homebuilding codes. You may need to reinforce your joists as well as installing the additional subfloor and cement board. Find out your numbers on your floor support and figure out the deflection before you go any further or you may just be giving yourself a headache of ripping out a failing floor in the future.

    Bookmark   September 26, 2011 at 9:56AM
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