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Old 02-12-2008, 08:15 PM   #1
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Sufficient subfloor for tile?


I know the subfloor requirement for tile is supposed to be 1 1/4". I have 3/4" ply existing and want to get away with using 1/4" hardibacker because the tile + backer + thinset is already going to raise the floor significantly above the floor in the adjoining hallway. The added floor height is also closing in on the bottom of the baseboard heater. Am I close enough with 1" of subfloor? Also, the existing floor are those vinyl,plastic, whatever they are self adhesive tiles. I had always thought it was best to tear those out and adhere the backer to the ply, but one of the guys at home depot told me I could leave the old tiles down. Is that true? It is a half bath, 44 square feet.

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Old 02-12-2008, 08:51 PM   #2
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Sufficient subfloor for tile?


Use Schluter's DITRA.

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Old 02-13-2008, 07:22 AM   #3
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Sufficient subfloor for tile?


I know DITRA says you can use it in place of the cement board, but are you recommending I use it instead of or in addition to the cement board? I already have the 1/4" cement board. Should I return it and use DITRA only?
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Old 02-13-2008, 11:11 AM   #4
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Sufficient subfloor for tile?


Use the cement board (attached with thinset and cement board screws) and then also use the Ditra over it.
Make sure that the existing flooring (3/4" plywood) was attached securely. If not, then go thru and add/re-nail it where needed.
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Old 02-13-2008, 11:37 AM   #5
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Sufficient subfloor for tile?


In an attempt to keep confusion at a minimum let's back up for a minute!

What type of floor joist do you have?
What size are your floor joists?
How far apart are they?
What is on the floor joists now (list one layer at a time)?
What size are the "vinyl" floor tiles?
What size is the intended new tile?
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