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    MGW1120's Avatar
    MGW1120 Posts: 1, Reputation: 1
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    #1

    Sep 23, 2010, 03:53 PM
    I only have 3/4" between plank subfloor and hardwood floor. How can I install tile?
    I live on the third floor of a 1903 brownstone in Boston. The area at our front door was tiled with ceramic. The tiles cracked and I decided to replace them. When I removed the tile and cement board, I discovered that the cement board was attached directly to the old 1x8 plank subfloor. I would like to replace the tile with stone tile but I don't have ethe depth (only 3/4') to add plywood, cement board and tile. I assume the prvious tile cracked because the cement board was attached directly to the planks. Any suggestions? Thanks.
    JazMan's Avatar
    JazMan Posts: 219, Reputation: 14
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    #2

    Sep 23, 2010, 07:28 PM

    You're right, that old floor was installed all wrong, never had a chance.

    Your new floor will be higher than the hardwood. The amount varies according to the specific tile and method you select. I'd recommend not going with stone since it'll require a much stiffer subfloor system than porcelain, and it's likely you'd have to stiffen the joists to get there.

    So for porcelain, install good quality underlayment grade 1/2" ply, (prefer thicker ply like 5/8") Then spread thin set & install 1/4" cement backer then the tiles. Or, if you can find Ditra use it instead of cement backer, saves you about 3/16".

    Fasten new ply with 1 1/4" flooring screws, do not use longer screws to hit the joists. Screw only to the planks.

    Jaz
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