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Thread: Subfloor

  1. #1
    DIY Junior Member JTlikestobuild's Avatar
    Join Date
    Feb 2013
    Vancouver BC

    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.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    Industry standards call for a minimum of 5/8" ply. Most pros don't like to use the minimum, so 3/4" is better. This is for ceramic...natural stone REQUIRES a second layer. The industry standards do not call for gluing the second layer. While it can be done, it requires a full spread of a wood glue (not something like construction adhesive from a tube) and proper fastener use and layout. BTW, all ply used for this must have NO 'D' faces, and have exposure I or exterior rated glue.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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