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Plywood vs MDF for garage shelves, I learned the hard way

Built a set of shelves in my garage last month using 3/4 MDF because it was $20 cheaper per sheet. After loading them with paint cans and tools, the middle shelf bowed almost 2 inches in the first week. Should I rip it all out and switch to plywood now or can I add a support beam underneath to fix it?
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2 Comments
richardknight
She turned into a SPONGE" is exactly why I ripped mine out and went with plywood.
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ericschmidt
Huh, nobody mentioned that MDF also turns into a sponge if your garage gets damp. You might be fixing the wrong problem with plywood that'll actually last.
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