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<blockquote data-quote="John Halliburton" data-source="post: 16101" data-attributes="member: 8">Re: DIY mini-stage/riser/platformEvan,They may &#039;&#039;work&#039;&#039;, but this is exactly the kind of engineering shortsightedness I was talking about.&nbsp; You need at least three cross members there(24&#039;&#039; O.C. if that&#039;s an 8&#039; length of plywood, and I think it is).&nbsp; I&#039;d prefer every 16&#039;&#039; O.C. for more rigidity.&nbsp; I&#039;d also prefer using 2x6 lumber at least.The flanges are mounted into the deck-the plywood is not meant to handle the shearing force that can be applied to this mounting scenario.&nbsp; If I were going to use the pipe flanges, I&#039;d glue and screw another layer of plywood, triangular, 12&#039;&#039; on each side, in each corner that a flange goes.&nbsp; I&#039;d then add a diagonally cut piece of the 2x4, sized to lay against the edge of the triangular plywood piece, and glue and fasten it all.&nbsp; Then I&#039;d use carriage bolts coming down from the top of the deck and bolt each flange to the now double thick reinforced deck corner.Best regards,John</blockquote>

[QUOTE="John Halliburton, post: 16101, member: 8"] Re: DIY mini-stage/riser/platform Evan, They may ''work'', but this is exactly the kind of engineering shortsightedness I was talking about. You need at least three cross members there(24'' O.C. if that's an 8' length of plywood, and I think it is). I'd prefer every 16'' O.C. for more rigidity. I'd also prefer using 2x6 lumber at least. The flanges are mounted into the deck-the plywood is not meant to handle the shearing force that can be applied to this mounting scenario. If I were going to use the pipe flanges, I'd glue and screw another layer of plywood, triangular, 12'' on each side, in each corner that a flange goes. I'd then add a diagonally cut piece of the 2x4, sized to lay against the edge of the triangular plywood piece, and glue and fasten it all. Then I'd use carriage bolts coming down from the top of the deck and bolt each flange to the now double thick reinforced deck corner. Best regards, John [/QUOTE]

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