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Top/Bottom Wall Plate (Timber Frame) 90 x 35 MGP12 instead of 90 x 45 MGP10?

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  1. #1
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    Default Top/Bottom Wall Plate (Timber Frame) 90 x 35 MGP12 instead of 90 x 45 MGP10?

    Hi there,

    I'm owner-building my first home and am a bit confused about the strength or interchangeability of these two.
    My plans call for a 90x45mm MGP10 bottom wall plate for a "non" load bearing wall and strangely a 90x35mm MGP12 for load-bearing?
    screen-shot-2018-08-03-09.25.59.jpg
    That would mean to me that a 90x35MGP12 is stronger than the 90x45mm MGP10? (or at least better suitable as a bottom wall plate?)
    But by the looks of it I do have to use 90x45mgp10 as a Top-Wall plate?

    This is all for a non-load bearing wall inside a steel frame (completely welded around)
    In a cyclone area (C3)

    wall-frame.jpg

    The 90x35 mgp12 is cheaper here as well.

    I would ask my engineer but I can't get hold of him and the original company I went with went bust.

    Also, any idea what to use to screw the bottom plate through the particle board into the 1.5mm thick steel joists? (Series 500 Tek Screws have a min. steel thickness of about 3mm)
    Thought of using maybe 1 or 2 M8 (8.8) bolts with washers and nuts instead? (this is to resist the lateral wind forces and so the wall can't get pushed in)

    Thanks heaps!

    Jan

  2. #2
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    Default Top/Bottom Wall Plate (Timber Frame) 90 x 35 MGP12 instead of 90 x 45 MGP10?

    MGP 12 is better than MGP 10. Use MGP 12.

    Bolts. You may find that you need to use threaded rod to tie down through top plate as well.
    Joined RF in 2006...Resigned in 2020.

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    Default

    Thanks. I know that MGP12 is stronger. I was just wondering if the 90x35 MGP12 is better or equal to 90x45 MGP10?
    Yeah officially I do have to have 1x M16 rod on each end of every wall section, going through bottom and top plate all the way and M12 rods every 1200mm on the bottom plate as well. (which doesn't make any sense to me since there are steel columns and bearers welded all around and there are no vertical loads only lateral wind forces)
    It would be fine if it was a timber home *strange... It would be weird having a M16 hold down rod right next to the fully welded 100x100x5mm Steel column

  4. #4
    Resigned SilentButDeadly's Avatar
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    Default Top/Bottom Wall Plate (Timber Frame) 90 x 35 MGP12 instead of 90 x 45 MGP10?

    Not sure...but bigger might well be better in this instance!

    So your timber walls are infill in a structural steel frame? The rod is not there as a vertical hold down. It is to counteract lateral racking loads. As an infill wall...it is installed to prevent the wall being sucked out of the steel frame.
    Joined RF in 2006...Resigned in 2020.

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