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Spans are based on minimum design properties for No. 2 grade lumber of Douglas fir-larch, hem-fir, Southern pine, and spruce-pine-fir. c. Building width is measured perpendicular to the ridge. For widths between those shown, spans are permitted to be interpolated.
SFPA provides size selection tables for various beam spans and loading combinations for Southern Pine dimension lumber and glulam.
Tabulated spans are the distance from face to face of supports. For sloping rafters the span is measured along the horizontal projection. The commentary provides further information on span measurements including a chart which converts horizontal distances to sloping distances, or vice versa. 6.OOF LOADS R
Tables R602.7 (1) and R602.7 (2) are based on minimum design values for #2 grade of Douglas firlarch, hem-fir and spruce-pine fir and #1 or better grade of southern pine. New Table R602.7 (3) has been added to provide girder and header spans for open porches.
R502.5 Allowable girder and header spans. 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).
• Spans are joists over a single span and are for use in covered structures. • Spans apply to lumber surfaced “GREEN” or surfaced “DRY” which conforms to Voluntary Products Standard PS 20-20 (3) sizes. • Applicable design criteria are shown in the heading for each table. • Spans are tabulated to 26 feet.
Span charts and 2012 IRC building codes for girders and headers. Includes span tables for all load bearing locations and the number of jack studs. These charts are for 30 pound per square foot snow load on the roof. All other data is available on page 121 of the 2012 International Residential Code. Girders are found in floor systems spanning ...
