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Title: Section 2306  •  Size: 4467

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2306.2.2 Notching. If possible, notching of beams should be avoided. Notches in sawn lumber bending members shall not exceed one sixth the depth of the member and shall not be located in the middle third of the span. Where members are notched at the ends, the notch depth shall not exceed one fourth the beam depth. The tension side of sawn lumber bending members of 4 inches (102 mm) or greater nominal thickness shall not be notched except at ends of members. Cantilevered portions of beams less than 4 inches (102 mm) in nominal thickness shall not be notched unless the reduced section properties and lumber defects are considered in the design. For effects of notch on shear strength, see Section 2306.4.

2306.7 Lateral Support. Solid-sawn rectangular lumber beams, rafters and joists shall be supported laterally to prevent rotation or lateral displacement in accordance with the following:

If the ratio of depth to thickness, based on nominal dimensions, is:

1. Two to 1, no lateral support is required.

2. Three to 1 or 4 to 1, the ends shall be held in position, as by full-depth solid blocking, bridging, nailing or bolting to other framing members, approved hangers or other acceptable means.

3. Five to 1, one edge shall be held in line for its entire length.

4. Six to 1, bridging, full-depth solid blocking or cross bracing shall be installed at intervals not exceeding 8 feet (2438 mm) unless:

4.1 Both edges of the member are held in line or,

4.2 The compression edge of the member is supported throughout its length to prevent lateral displacement, as by adequate sheathing or subflooring, and the ends and all points of bearing have lateral support to prevent rotation.

5. Seven to 1, both edges shall be held in line for their entire length.

If a beam is subject to both flexure and compression parallel to grain, the ratio may be as much as 5 to 1 if one edge is held firmly in line. If under any combination of load the unbraced edge of the member is in tension, the ratio may be 6 to 1.

In lieu of providing lateral support by the methods specified in Items 2 through 5 above, the allowable stresses shall be reduced by the slenderness factor set forth in Section 2304.3.6.

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