Structural · S-PXJNP

Rafter Repair Detail

Materials

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An existing cracked wood rafter is repaired using three-quarter-inch plywood plates installed on each side, matching the full depth of the rafter. The crack in the existing rafter is first filled with construction adhesive. The plywood side plates are clamped tight and secured with number ten by two-and-a-half-inch wood screws spaced at three inches on center, with lead holes pre-drilled. Screws on the far side are offset by three-quarters of an inch to prevent splitting. Where applicable, horizontal and notched seat cuts are provided at the rafter bearing point.

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