Pick furniture-grade plywood for large, conspicuous wood surfaces, and then choose a core suitable for how the panel will be used. For open casework, such as a bookcase or fireplace cabinetry, select veneer-core plywood with an Al or A2 grade (see "Making the grade," below). Veneer-core is the lightest of the plywoods and holds screws best, making construction much easier. Because it is light, it is less likely to sag when used for shelving or other long spans. Plus, it's easier to reinforce its edge by screwing it to a cabinet case or other support. In most cases, go with 3/4-in. thickness.
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