Screw Length Requirements

There is no hard and fast rule concerning screw length requirements. Sometimes you don’t have much choice as to length because of the construction details. In general though, the screw should always go through the thinner piece, and thread into the thicker piece. In choosing length, try to have about 2/3 of the screw threaded into the “secondary” piece, as shown. As the thickness of the lumber increases though, this ratio can be reduced so that only 1/2 of the shank is threaded into the secondary piece. Not coincidentally, only 2/3 of the shank is threaded on our 1" and longer screws.

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