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Use this tag for questions dealing with whether something will collapse. For questions dealing with dimensional stability use the [moisture] tag.

2 votes

Improving sag resistance of MDF shelves

You could stiffen them up by nailing or screwing a 1/2" x 1" or 3/4" x 1 1/2" hardwood strip across the underside of the front edge of each shelf.
Jimmy Fix-it's user avatar