Have an L girder table, need 9" height to underside of platfrom area of 1/2 plywood. Am finding considerable sway in 1 x 3 risers which extend 9" high above bench work? SUggestions?
I assume your 1 x 3 risers are attached to joists, which in many cases are 1x2. Here are suggestion to reduce the “sway” or to increase the torsional Resistance of the joint and riser:
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Glue and screw everything.
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Go head and attach the plywood to the riser. Again glue and screw.
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If the sway is still un-satisfactory, glue and screw another 1x2 joist to the existing joist or if you have room change to a 1x3 or 1x4 joist.
Email me if you have questions.
In triangles there is strength. Assuming the sway is lengthwise rather than crosswise, diagonal braces might do a world of good. 1x2 should be fine.
Pete
To be more clear, The 1x3 braces are vertical, screwed to 1 x 3 joists… The sway is at 90degrees to the major axis of the joist; obviously this is the direction in which there would be the least resistance to a force applied to the assembly. What I have to do is locate lmost all of these joints in a corner ehere the joist mounts on the L girder, and I scdrew anothe triangle brace into the side of the riser and down into the L Girder. Seeing out that works reduce the posiibility of the swaying of the joists.