subfloor for ceramic tile

Old 11-19-03, 04:40 PM
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subfloor for ceramic tile

on a 1950 era wood plank floor, what type of subfloor material is required for 8x8 ceramic tiles?
Old 11-19-03, 08:22 PM
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Hello and welcome to the forums. Plank flooring isn't an acceptable substrate for any sort of tile, other than peel & stick. You're gonna want some 5/8" plywood, 2 layers preferrably, but before we even go there, let's talk floor joists, need to know the size, 2"x10", 2"x12", spacing 16" centers, 24", and lastly span, how far do the floor joist span with support. These numbers will give you a deflection ratio, this is what you've got to know to determine if your floor will support ceramic tile as they are or if you will have to beef up your support prior to laying down plywood, which must go in before you start setting tile.
Thing you got to understand is that tile, be it ceramic, porcelin, whatever adds considerably to the load that your floor joists must support. Do your homework & post back with the numbers I described & we'll be able to get you on the right track for a beautiful tile install that will out live you & me.

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