ICC Subscriptions
 
R502.5 Allowable girder spans.
The allowable spans of girders fabricated of dimension lumber shall not exceed the values set forth in Tables R502.5(1) and R502.5(2).

TABLE R502.5(1) GIRDER SPANSa AND HEADER SPANSa FOR EXTERIOR BEARING WALLS (Maximum spans for Douglas fir-larch, hem-fir, southern pine and spruce-pine-firb and required number of jack studs)


GIRDERS AND HEADERS SUPPORTING SIZE GROUND SNOW LOAD (psf)e
30 50 70
Building widthc (feet)
20 28 36 20 28 36 20 28 36
Span NJd Span NJd Span NJd Span NJd Span NJd Span NJd Span NJd Span NJd Span NJd
Roof and ceiling 2-2 × 4 3-6 1 3-2 1 2-10 1 3-2 1 2-9 1 2-6 1 2-10 1 2-6 1 2-3 1
2-2 × 6 5-5 1 4-8 1 4-2 1 4-8 1 4-1 1 3-8 2 4-2 1 3-8 2 3-3 2
2-2 × 8 6-10 1 5-11 2 5-4 2 5-11 2 5-2 2 4-7 2 5-4 2 4-7 2 4-1 2
2-2 × 10 8-5 2 7-3 2 6-6 2 7-3 2 6-3 2 5-7 2 6-6 2 5-7 2 5-0 2
2-2 × 12 9-9 2 8-5 2 7-6 2 8-5 2 7-3 2 6-6 2 7-6 2 6-6 2 5-10 3
3-2 × 8 8-4 1 7-5 1 6-8 1 7-5 1 6-5 2 5-9 2 6-8 1 5-9 2 5-2 2
3-2 × 10 10-6 1 9-1 2 8-2 2 9-1 2 7-10 2 7-0 2 8-2 2 7-0 2 6-4 2
3-2 × 12 12-2 2 10-7 2 9-5 2 10-7 2 9-2 2 8-2 2 9-5 2 8-2 2 7-4 2
4-2 × 8 9-2 1 8-4 1 7-8 1 8-4 1 7-5 1 6-8 1 7-8 1 6-8 1 5-11 2
4-2 × 10 11-8 1 10-6 1 9-5 2 10-6 1 9-1 2 8-2 2 9-5 2 8-2 2 7-3 2
4-2 × 12 14-1 1 12-2 2 10-11 2 12-2 2 10-7 2 9-5 2 10-11 2 9-5 2 8-5 2
Roof, ceiling
and one center-
bearing floor
2-2 × 4 3-1 1 2-9 1 2-5 1 2-9 1 2-5 1 2-2 1 2-7 1 2-3 1 2-0 1
2-2 × 6 4-6 1 4-0 1 3-7 2 4-1 1 3-7 2 3-3 2 3-9 2 3-3 2 2-11 2
2-2 × 8 5-9 2 5-0 2 4-6 2 5-2 2 4-6 2 4-1 2 4-9 2 4-2 2 3-9 2
2-2 × 10 7-0 2 6-2 2 5-6 2 6-4 2 5-6 2 5-0 2 5-9 2 5-1 2 4-7 3
2-2 × 12 8-1 2 7-1 2 6-5 2 7-4 2 6-5 2 5-9 3 6-8 2 5-10 3 5-3 3
3-2 × 8 7-2 1 6-3 2 5-8 2 6-5 2 5-8 2 5-1 2 5-11 2 5-2 2 4-8 2
3-2 × 10 8-9 2 7-8 2 6-11 2 7-11 2 6-11 2 6-3 2 7-3 2 6-4 2 5-8 2
3-2 × 12 10-2 2 8-11 2 8-0 2 9-2 2 8-0 2 7-3 2 8-5 2 7-4 2 6-7 2
4-2 × 8 8-1 1 7-3 1 6-7 1 7-5 1 6-6 1 5-11 2 6-10 1 6-0 2 5-5 2
4-2 × 10 10-1 1 8-10 2 8-0 2 9-1 2 8-0 2 7-2 2 8-4 2 7-4 2 6-7 2
4-2 × 12 11-9 2 10-3 2 9-3 2 10-7 2 9-3 2 8-4 2 9-8 2 8-6 2 7-7 2
Roof, ceiling
and one clear span floor
2-2 × 4 2-8 1 2-4 1 2-1 1 2-7 1 2-3 1 2-0 1 2-5 1 2-1 1 1-10 1
2-2 × 6 3-11 1 3-5 2 3-0 2 3-10 2 3-4 2 3-0 2 3-6 2 3-1 2 2-9 2
2-2 × 8 5-0 2 4-4 2 3-10 2 4-10 2 4-2 2 3-9 2 4-6 2 3-11 2 3-6 2
2-2 × 10 6-1 2 5-3 2 4-8 2 5-11 2 5-1 2 4-7 3 5-6 2 4-9 2 4-3 3
2-2 × 12 7-1 2 6-1 3 5-5 3 6-10 2 5-11 3 5-4 3 6-4 2 5-6 3 5-0 3
3-2 × 8 6-3 2 5-5 2 4-10 2 6-1 2 5-3 2 4-8 2 5-7 2 4-11 2 4-5 2
3-2 × 10 7-7 2 6-7 2 5-11 2 7-5 2 6-5 2 5-9 2 6-10 2 6-0 2 5-4 2
3-2 × 12 8-10 2 7-8 2 6-10 2 8-7 2 7-5 2 6-8 2 7-11 2 6-11 2 6-3 2
4-2 × 8 7-2 1 6-3 2 5-7 2 7-0 1 6-1 2 5-5 2 6-6 1 5-8 2 5-1 2
4-2 × 10 8-9 2 7-7 2 6-10 2 8-7 2 7-5 2 6-7 2 7-11 2 6-11 2 6-2 2
4-2 × 12 10-2 2 8-10 2 7-11 2 9-11 2 8-7 2 7-8 2 9-2 2 8-0 2 7-2 2
Roof, ceiling
and two center-
bearing floors
2-2 × 4 2-7 1 2-3 1 2-0 1 2-6 1 2-2 1 1-11 1 2-4 1 2-0 1 1-9 1
2-2 × 6 3-9 2 3-3 2 2-11 2 3-8 2 3-2 2 2-10 2 3-5 2 3-0 2 2-8 2
2-2 × 8 4-9 2 4-2 2 3-9 2 4-7 2 4-0 2 3-8 2 4-4 2 3-9 2 3-5 2
2-2 × 10 5-9 2 5-1 2 4-7 3 5-8 2 4-11 2 4-5 3 5-3 2 4-7 3 4-2 3
2-2 × 12 6-8 2 5-10 3 5-3 3 6-6 2 5-9 3 5-2 3 6-1 3 5-4 3 4-10 3
3-2 × 8 5-11 2 5-2 2 4-8 2 5-9 2 5-1 2 4-7 2 5-5 2 4-9 2 4-3 2
3-2 × 10 7-3 2 6-4 2 5-8 2 7-1 2 6-2 2 5-7 2 6-7 2 5-9 2 5-3 2
3-2 × 12 8-5 2 7-4 2 6-7 2 8-2 2 7-2 2 6-5 3 7-8 2 6-9 2 6-1 3
4-2 × 8 6-10 1 6-0 2 5-5 2 6-8 1 5-10 2 5-3 2 6-3 2 5-6 2 4-11 2
4-2 × 10 8-4 2 7-4 2 6-7 2 8-2 2 7-2 2 6-5 2 7-7 2 6-8 2 6-0 2
4-2 × 12 9-8 2 8-6 2 7-8 2 9-5 2 8-3 2 7-5 2 8-10 2 7-9 2 7-0 2
Roof, ceiling,
and two clear
span floors
2-2 × 4 2-1 1 1-8 1 1-6 2 2-0 1 1-8 1 1-5 2 2-0 1 1-8 1 1-5 2
2-2 × 6 3-1 2 2-8 2 2-4 2 3-0 2 2-7 2 2-3 2 2-11 2 2-7 2 2-3 2
2-2 × 8 3-10 2 3-4 2 3-0 3 3-10 2 3-4 2 2-11 3 3-9 2 3-3 2 2-11 3


(continued)


TABLE R502.5(1)—continued GIRDER SPANSa AND HEADER SPANSa FOR EXTERIOR BEARING WALLS (Maximum spans for Douglas fir-larch, hem-fir, southern pine and spruce-pine-firb and required number of jack studs)


GIRDERS AND HEADERS SUPPORTING SIZE GROUND SNOW LOAD (psf)e
30 50 70
Building widthc (feet)
20 28 36 20 28 36 20 28 36
Span NJd Span NJd Span NJd Span NJd Span NJd Span NJd Span NJd Span NJd Span NJd
Roof, ceiling,
and two clear span floors
2-2 × 10 4-9 2 4-1 3 3-8 3 4-8 2 4-0 3 3-7 3 4-7 3 4-0 3 3-6 3
2-2 × 12 5-6 3 4-9 3 4-3 3 5-5 3 4-8 3 4-2 3 5-4 3 4-7 3 4-1 4
3-2 × 8 4-10 2 4-2 2 3-9 2 4-9 2 4-1 2 3-8 2 4-8 2 4-1 2 3-8 2
3-2 × 10 5-11 2 5-1 2 4-7 3 5-10 2 5-0 2 4-6 3 5-9 2 4-11 2 4-5 3
3-2 × 12 6-10 2 5-11 3 5-4 3 6-9 2 5-10 3 5-3 3 6-8 2 5-9 3 5-2 3
4-2 × 8 5-7 2 4-10 2 4-4 2 5-6 2 4-9 2 4-3 2 5-5 2 4-8 2 4-2 2
4-2 × 10 6-10 2 5-11 2 5-3 2 6-9 2 5-10 2 5-2 2 6-7 2 5-9 2 5-1 2
4-2 × 12 7-11 2 6-10 2 6-2 3 7-9 2 6-9 2 6-0 3 7-8 2 6-8 2 5-11 3

For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa.
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.
e.    Use 30 psf ground snow load for cases in which ground snow load is less than 30 psf and the roof live load is equal to or less than 20 psf.


TABLE R502.5(2) GIRDER SPANSa AND HEADER SPANSa FOR INTERIOR BEARING WALLS (Maximum spans for Douglas fir-larch, hem-fir, southern pine and spruce-pine-firb and required number of jack studs)


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.