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    DIY Junior Member JTlikestobuild's Avatar
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    Feb 2013
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    Vancouver BC
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    Default Subfloor

    Is the 1 1/4" thick sub floor rule of thumb under a tile/stone floor necessary if the floor joist are on 12" centers

    Instead of using 2 sheet of plywood and spending the time to screw and glue I'm thinking of using one layer of 1" plywood.

    One failing I can think of is more deflection at the ends but this can be solved with some blocking.

    I had the joist engineered for deflection (L/1000) rather than just the live/dead load. Deflection along the length of the joists is not a concern.

    Don't want any deflection in the plywood between the joists.
    Last edited by JTlikestobuild; 02-23-2013 at 07:24 PM.

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