When building a shelving unit or bookshelf that will need to hold a great deal of weight (for instance, a bookcase that holds a series of very heavy books like law books or a set of encyclopedias), a single 3/4" shelf constructed out of plywood or a single 1x12 board will likely be prone to sagging over time. Fortunately, if you plan ahead for dealing with such weight, there are a couple of simple solutions to prevent the problem.
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