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Discussion Starter · #1 ·
I want to build a simple rectangular platform, about 6 inches high, 2 feet by 3 feet.
It should be able to hold a person up to 200 pounds.

If I made this simply with 4 6" pieces of 3/4 plywood and a 2'x3' sheet of 3/4 plywood on top, glue and wood screws on the joints, would it be sturdy enough, or would it require more support not to collapse under pressure?
 

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Use 2 X 6's to make the box, not plywood 1, 2 x6 in the middle for support and use 3/4" Advantec for the subfloor.
That will be more then strong enough.
 

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Watch For Deflection

Your initial proposal will work without collapsing. It may "feel" spongy though.
One word of caution. One more 6" x 2'-0" spanning the 2 ft direction so as to cut the 3 ft dimension into two 1ft 6 in spaces will prevent the platform from deflecting in the center when under load. Just a suggestion.
 
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