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Smitty Two Smitty Two is offline
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Default plywood deflection rating

In article ,
"John Gilmer" wrote:

"Jeff D." wrote in message
Not an expert on load tables but from what I can understand 3/4" at 4ft
between supports would only be good for about 30lbs ??

Yeah, that "sounds" about right.

With a 2' span, it would take 4 times the load to have the same deflection.
That's likely the way to go.

Maybe the OP can put support the shelves one foot in from each end, with
two feet between supports. Otherwise a little piece of angle iron bolted
to the bottom of each shelf will stiffen it.