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  • I’m making a couple of torsion box alcove shelves.

    2.3m span with 30x30 battens which are fixed together and to studs.

    It’s solidly attached but I can flex the middle of the span up and down by 5mm with my hand. Is that going to sort itself out with 12mm ply glued and nailed to top and bottom?

    Wondering if I need more spans or worst case some floor braces?

  • torsion box alcove shelves

    Never heard of these before. It sounds like the top and bottoms are essential to the strength, so Idk if you can rely on your 5mm flexing as an indication of final rigidity.

    How much will putting an additional bracing(?) strip on the front muck up your design?

    If the ply is vertical that will be pretty stiff.


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