Repair bathroom tile floor

leocadieFebruary 22, 2009

I've inherited a brick duplex built in 1957. On one side the tile bathroom floor is cracking. Part of it has dropped down about 1/4 inch. When I looked underneath, in the crawl space, the tile is laid on an old style bed of mortar. A board supports the mortar base, and this board is supported on each side by 2 x 2s nailed to the joists.

I think the problem is that the board supporting the mortar base is sagging. Wondering if I could install a new board underneath the old, and support it with jack posts? The floor joists are 16 inch on center.

Will appreciate your advice. Thanks!

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To support the floor, you can just bolt the current 2x2 to the joist if it's just loose and not rotted. You can add the other piece, but I would secure the one that's there now before adding the other piece.

    Bookmark   February 22, 2009 at 3:02PM
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You probably can jack it up, but consider the cause of the sagging, it's probably moisture. The real solution is to redo the floor. If you do, consider using a fibre cement product that is truly water/rot proof vs the plywood that seems to be favoured in north america. Rot in such material exposed to moisture (of course the tile base should be made waterproof) is inevitable.

    Bookmark   February 23, 2009 at 12:13PM
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