Chapter 10 Floor Framing 239 can be adjusted for plumb if the anchor bolt was improperly located. When a wood column supports a steel girder, consider fitting the end of the column with a metal cap. If wood supports wood, install a metal cap to give an even bearing surface. The metal also pre- vents the end grain of the post from crushing the horizontal grain of the wood girder. A built-up wood post may be made by nail- ing together three 2 × 6s. The pieces should be Portions of this publication reproduce excerpts from the 2015 International Residential Code for One- and Two-Family Dwellings, International Code Council, Inc., Washington, D.C. Reproduced with permission. All rights reserved. Figure 10-8. Spans for built-up wood girders according to IRC Table R602.7(2). HEADERS AND GIRDERS SUPPORTING Size Building Widthc (feet) 20 28 36 Span NJd Span NJd Span NJd One floor only 2-2 × 4 3-1 1 2-8 1 2-5 1 2-2 × 6 4-6 1 3-11 1 3-6 1 2-2 × 8 5-9 1 5-0 2 4-5 2 2-2 × 10 7-0 2 6-1 2 5-5 2 2-2 × 12 8-1 2 7-0 2 6-3 2 3-2 × 8 7-2 1 6-3 1 5-7 2 3-2 × 10 8-9 1 7-7 2 6-9 2 3-2 × 12 10-2 2 8-10 2 7-10 2 4-2 × 8 9-0 1 7-8 1 6-9 1 4-2 × 10 10-1 1 8-9 1 7-10 2 4-2 × 12 11-9 1 10-2 2 9-1 2 Two floors 2-2 × 4 2-2 1 1-10 1 1-7 1 2-2 × 6 3-2 2 2-9 2 2-5 2 2-2 × 8 4-1 2 3-6 2 3-2 2 2-2 × 10 4-11 2 4-3 2 3-10 3 2-2 × 12 5-9 2 5-0 3 4-5 3 3-2 × 8 5-1 2 4-5 2 3-11 2 3-2 × 10 6-2 2 5-4 2 4-10 2 3-2 × 12 7-2 2 6-3 2 5-7 3 4-2 × 8 6-1 1 5-3 2 4-8 2 4-2 × 10 7-2 2 6-2 2 5-6 2 4-2 × 12 8-4 2 7-2 2 6-5 2 For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. a. Spans are given in feet and inches. b. Tabulated values assume #2 grade lumber. c. Building width is measured perpendicular to the ridge. For widths between those shown, spans are permitted to be interpolated. d. NJ – Number of jack studs required to support each end. Where the number of required jack studs equals one, the header is permitted to be supported by an approved framing anchor attached to the full-height wall stud and to the header. Copyright Goodheart-Willcox Co., Inc.