The vertical deformation resistance of a ¡°C¡± or box frame member is dependent mostly on the length, material and wall thickness of the vertical sides of the frame (called the web of the frame), not the horizontal top and bottom portions.? So drilling relatively small holes for floor fasteners into the top of a box frame would not significantly weaken the entire structure.
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Dave
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Don, how was your floor attached to your frame?? I've always thought it would be a bad idea to bolt the floor to the main beams, because putting a big hole on the top of a beam will weaken it.?
