Using Douglas fir–larch, No. 2 grade, pick the joist size required from Table 5.10 for the stated conditions. Live load is 40 psf, dead load is 10 psf, and deflection is limited to L/360 under live load only. TABLE 5.10 Maximum Spans for Floor Joists (ft-in.)aJoist SizeSpacing (in.)2 x 62x 82 x 102 x 12Live load = 40 psf, Dead load = 10 psf, Maximum live-load deflection = L/3601210-914-217-920-7169-912-715-517-1019.29-111-614-116-3248-110-312-714-7Live load = 40 psf, Dead load = 20 psf, Maximum live-load deflection = L/3601210-613-316-318-10169-111-614-116-319.28-310-612-1014-10247-59-5011-613-4Source: Compiled from data in the International Building Code (Ref. 4), with permission of thepublisher, International Code Council."Joists are Douglas fir-larch, No. 2 grade. Assumed maximum available length of single piece is26 ft.

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Answered: Using Douglas fir–larch, No. 2 grade,…

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

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Using Douglas fir–larch, No. 2 grade, pick the joist size required from Table 5.10 for the stated conditions. Live load is 40 psf, dead load is 10 psf, and deflection is limited to L/360 under live load only.

TABLE 5.10 Maximum Spans for Floor Joists (ft-in.)a
Joist Size
Spacing (in.)
2 x 6
2x 8
2 x 10
2 x 12
Live load = 40 psf, Dead load = 10 psf, Maximum live-load deflection = L/360
12
10-9
14-2
17-9
20-7
16
9-9
12-7
15-5
17-10
19.2
9-1
11-6
14-1
16-3
24
8-1
10-3
12-7
14-7
Live load = 40 psf, Dead load = 20 psf, Maximum live-load deflection = L/360
12
10-6
13-3
16-3
18-10
16
9-1
11-6
14-1
16-3
19.2
8-3
10-6
12-10
14-10
24
7-5
9-50
11-6
13-4
Source: Compiled from data in the International Building Code (Ref. 4), with permission of the
publisher, International Code Council.
"Joists are Douglas fir-larch, No. 2 grade. Assumed maximum available length of single piece is
26 ft.

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