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GIRDER AND HEADER SPANS a FOR OPEN PORCHES (Maximum span for Douglas fir-larch, hem-fir, Southern pine and spruce-pine-fir b) For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa. a. Spans are given in feet and inches.
Use of these span tables requires reference to the applicable design values for the various species and grades of lumber. Tables W-1 and W-2 of Design Values for Joists and Rafters, a supplement to these span tables, provide such values for them ostc ommonly used framing sizes. Modulus of elasticity (E), bending design values (F b
EXAMPLE. Determine the minimum size and bearing support requirements for a #2 Douglas fi r-larch header in an exterior bearing wall as shown in Figure 6-21. Th e width of the building is 28 feet, the header span is 7 feet, and the snow load is 30 psf. Refer to Table 6-5 and Figure 6-21.
SFPA provides size selection tables for various beam spans and loading combinations for Southern Pine dimension lumber and glulam.
The allowable spans of girders and headers fabricated of dimension lumber shall not exceed the values set forth in Tables R602.7 (1), R602.7 (2) and R602.7 (3). Tables R602.7 (1) and R602.7 (2) list allowable spans for girders.
The simplified span tables which appear in this booklet have been prepared by the Pacific Lumber Inspection Bureau to facilitate the use and specification of selected imported softwood species in common joist and rafter installations for light frame construction.
Span tables for visual and mechanical grades of southern pine lumber joists and rafters, and southern pine lumber and glue-laminated timber (glulam) headers, beams and girders. View SPC Span Tables Photo SFPA
