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Girder Splices

1-8. Girder Splices

To make a built-up girder, select straight lumber free from knots and other defects. The stock should be long enough so that no more than one joint will occur over the span between footings. The joints in the beam should be staggered, taking care to square the planks at each joint and butt them tightly together.

a. Half-Lap Joint Sometimes a half-lap joint is used to join solid beams. In this case, place the beam on one edge so the annual rings run from top to bottom. The lines for the half-lap joint are then laid out (see Figure 1-13 ). Cuts are made along these lines, then checked with a steel square to assure a matching joint. Repeat this process on the other beam.

Figure 1-13.  Girder splices
Figure 1-13. Girder splices

b. Temporary Strap. Tack a temporary strap across the joint to hold it tightly together. Drill a hole the joint with a bit about 1/16 inch larger than the bolt to be used, and fasten the joint with a bolt, a washer, and a nut.

c. Strapped Joint. When a strapped butt joint is used to join solid beams, the ends of the beams should be cut square. The straps, which are generally 18 inches long, are bolted to each side of the beams.


David L. Heiserman, Editor

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Revised: June 06, 2015