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  1. J

    Resting Floor Joist On Of Box Steel

    Hi All, Doing a DIY extension and looking for a some advice. I have put the box steel in above the bifold opening which was quite a big one at 300 x 200 x 8 RHS. This means the top of the box steel is around 2.45m and given the height restriction and it being a warm roof I am tight on space...
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