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// CODE SNIPPET

2308.7 Roof and Ceiling Framing

Building Code 2018 of Illinois > 23 Wood > 2308 Conventional Light-Frame Construction > 2308.7 Roof and Ceiling Framing
JUMP TO FULL CODE CHAPTER
The framing details required in this section apply to roofs having a slope of not less than three units vertical in 12 units horizontal (25-percent slope). Where the roof slope is less than three units vertical in 12 units horizontal (25-percent slope), members supporting rafters and ceiling joists such as ridge board, hips and valleys shall be designed as beams.

2308.7.1 Ceiling Joist Spans

Spans for ceiling joists shall be in accordance with Table 2308.7.1(1) or 2308.7.1(2). For other grades and species, and other loading conditions, refer to the AWC STJR.
TABLE 2308.7.1(1)
CEILING JOIST SPANS FOR COMMON LUMBER SPECIES
(Uninhabitable attics without storage, live load = 10 psf, L/Δ = 240)
CEILING JOIST
SPACING (inches)
SPECIES AND GRADE DEAD LOAD = 5 psf
2 × 4 2 × 6 2 × 8 2 × 10
Maximum ceiling joist spans
(ft. - in.) (ft. - in.) (ft. - in.) (ft. - in.)
12 Douglas Fir-Larch SS 13-2 20-8 Note a Note a
Douglas Fir-Larch #1 12-8 19-11 Note a Note a
Douglas Fir-Larch #2 12-5 19-6 25-8 Note a
Douglas Fir-Larch #3 10-10 15-10 20-1 24-6
Hem-Fir SS 12-5 19-6 25-8 Note a
Hem-Fir #1 12-2 19-1 25-2 Note a
Hem-Fir #2 11-7 18-2 24-0 Note a
Hem-Fir #3 10-10 15-10 20-1 24-6
Southern Pine SS 12-11 20-3 Note a Note a
Southern Pine #1 12-5 19-6 25-8 Note a
Southern Pine #2 11-10 18-8 24-7 Note a
Southern Pine #3 10-1 14-11 18-9 22-9
Spruce-Pine-Fir SS 12-2 19-1 25-2 Note a
Spruce-Pine-Fir #1 11-10 18-8 24-7 Note a
Spruce-Pine-Fir #2 11-10 18-8 24-7 Note a
Spruce-Pine-Fir #3 10-10 15-10 20-1 24-6
16 Douglas Fir-Larch SS 11-11 18-9 24-8 Note a
Douglas Fir-Larch #1 11-6 18-1 23-10 Note a
Douglas Fir-Larch #2 11-3 17-8 23-0 Note a
Douglas Fir-Larch #3 9-5 13-9 17-5 21-3
Hem-Fir SS 11-3 17-8 23-4 Note a
Hem-Fir #1 11-0 17-4 22-10 Note a
Hem-Fir #2 10-6 16-6 21-9 Note a
Hem-Fir #3 9-5 13-9 17-5 21-3
Southern Pine SS 11-9 18-5 24-3 Note a
Southern Pine #1 11-3 17-8 23-4 Note a
Southern Pine #2 10-9 16-11 21-7 25-7
Southern Pine #3 8-9 12-11 16-3 19-9
Spruce-Pine-Fir SS 11-0 17-4 22-10 Note a
Spruce-Pine-Fir #1 10-9 16-11 22-4 Note a
Spruce-Pine-Fir #2 10-9 16-11 22-4 Note a
Spruce-Pine-Fir #3 9-5 13-9 17-5 21-3
19.2 Douglas Fir-Larch SS 11-3 17-8 23-3 Note a
Douglas Fir-Larch #1 10-10 17-0 22-5 Note a
Douglas Fir-Larch #2 10-7 16-7 21-0 25-8
Douglas Fir-Larch #3 8-7 12-6 15-10 19-5
Hem-Fir SS 10-7 16-8 21-11 Note a
Hem-Fir #1 10-4 16-4 21-6 Note a
Hem-Fir #2 9-11 15-7 20-6 25-3
Hem-Fir #3 8-7 12-6 15-10 19-5
Southern Pine SS 11-0 17-4 22-10 Note a
Southern Pine #1 10-7 16-8 22-0 Note a
Southern Pine #2 10-2 15-7 19-8 23-5
Southern Pine #3 8-0 11-9 14-10 18-0
Spruce-Pine-Fir SS 10-4 16-4 21-6 Note a
Spruce-Pine-Fir #1 10-2 15-11 21-0 25-8
Spruce-Pine-Fir #2 10-2 15-11 21-0 25-8
Spruce-Pine-Fir #3 8-7 12-6 15-10 19-5
24 Douglas Fir-Larch SS 10-5 16-4 21-7 Note a
Douglas Fir-Larch #1 10-0 15-9 20-1 24-6
Douglas Fir-Larch #2 9-10 14-10 18-9 22-11
Douglas Fir-Larch #3 7-8 11-2 14-2 17-4
Hem-Fir SS 9-10 15-6 20-5 Note a
Hem-Fir #1 9-8 15-2 19-7 23-11
Hem-Fir #2 9-2 14-5 18-6 22-7
Hem-Fir #3 7-8 11-2 14-2 17-4
Southern Pine SS 10-3 16-1 21-2 Note a
Southern Pine #1 9-10 15-6 20-5 24-0
Southern Pine #2 9-3 13-11 17-7 20-11
Southern Pine #3 7-2 10-6 13-3 16-1
Spruce-Pine-Fir SS 9-8 15-2 19-11 25-5
Spruce-Pine-Fir #1 9-5 14-9 18-9 22-11
Spruce-Pine-Fir #2 9-5 14-9 18-9 22-11
Spruce-Pine-Fir #3 7-8 11-2 14-2 17-4
Check sources for availability of lumber in lengths greater than 20 feet.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa.
  1. Span exceeds 26 feet in length.
TABLE 2308.7.1(2)
CEILING JOIST SPANS FOR COMMON LUMBER SPECIES
(Uninhabitable attics with limited storage, live load = 20 psf, L/Δ = 240)
CEILING JOIST
SPACING (inches)
SPECIES AND GRADE DEAD LOAD = 10 psf
2 × 4 2 × 6 2 × 8 2 × 10
Maximum ceiling joist spans
(ft. - in.) (ft. - in.) (ft. - in.) (ft. - in.)
12 Douglas Fir-Larch SS 10-5 16-4 21-7 Note a
Douglas Fir-Larch #1 10-0 15-9 20-1 24-6
Douglas Fir-Larch #2 9-10 14-10 18-9 22-11
Douglas Fir-Larch #3 7-8 11-2 14-2 17-4
Hem-Fir SS 9-10 15-6 20-5 Note a
Hem-Fir #1 9-8 15-2 19-7 23-11
Hem-Fir #2 9-2 14-5 18-6 22-7
Hem-Fir #3 7-8 11-2 14-2 17-4
Southern Pine SS 10-3 16-1 21-2 Note a
Southern Pine #1 9-10 15-6 20-5 24-0
Southern Pine #2 9-3 13-11 17-7 20-11
Southern Pine #3 7-2 10-6 13-3 16-1
Spruce-Pine-Fir SS 9-8 15-2 19-11 25-5
Spruce-Pine-Fir #1 9-5 14-9 18-9 22-11
Spruce-Pine-Fir #2 9-5 14-9 18-9 22-11
Spruce-Pine-Fir #3 7-8 11-2 14-2 17-4
16 Douglas Fir-Larch SS 9-6 14-11 19-7 25-0
Douglas Fir-Larch #1 9-1 13-9 17-5 21-3
Douglas Fir-Larch #2 8-9 12-10 16-3 19-10
Douglas Fir-Larch #3 6-8 9-8 12-4 15-0
Hem-Fir SS 8-11 14-1 18-6 23-8
Hem-Fir #1 8-9 13-5 16-10 20-8
Hem-Fir #2 8-4 12-8 16-0 19-7
Hem-Fir #3 6-8 9-8 12-4 15-0
Southern Pine SS 9-4 14-7 19-3 24-7
Southern Pine #1 8-11 14-0 17-9 20-9
Southern Pine #2 8-0 12-0 15-3 18-1
Southern Pine #3 6-2 9-2 11-6 14-0
Spruce-Pine-Fir SS 8-9 13-9 18-1 23-1
Spruce-Pine-Fir #1 8-7 12-10 16-3 19-10
Spruce-Pine-Fir #2 8-7 12-10 16-3 19-10
Spruce-Pine-Fir #3 6-8 9-8 12-4 15-0
19.2 Douglas Fir-Larch SS 8-11 14-0 18-5 23-4
Douglas Fir-Larch #1 8-7 12-6 15-10 19-5
Douglas Fir-Larch #2 8-0 11-9 14-10 18-2
Douglas Fir-Larch #3 6-1 8-10 11-3 13-8
Hem-Fir SS 8-5 13-3 17-5 22-3
Hem-Fir #1 8-3 12-3 15-6 18-11
Hem-Fir #2 7-10 11-7 14-8 17-10
Hem-Fir #3 6-1 8-10 11-3 13-8
Southern Pine SS 8-9 13-9 18-2 23-1
Southern Pine #1 8-5 12-9 16-2 18-11
Southern Pine #2 7-4 11-0 13-11 16-6
Southern Pine #3 5-8 8-4 10-6 12-9
Spruce-Pine-Fir SS 8-3 12-11 17-1 21-8
Spruce-Pine-Fir #1 8-0 11-9 14-10 18-2
Spruce-Pine-Fir #2 8-0 11-9 14-10 18-2
Spruce-Pine-Fir #3 6-1 8-10 11-3 13-8
24 Douglas Fir-Larch SS 8-3 13-0 17-1 20-11
Douglas Fir-Larch #1 7-8 11-2 14-2 17-4
Douglas Fir-Larch #2 7-2 10-6 13-3 16-3
Douglas Fir-Larch #3 5-5 7-11 10-0 12-3
Hem-Fir SS 7-10 12-3 16-2 20-6
Hem-Fir #1 7-6 10-11 13-10 16-11
Hem-Fir #2 7-1 10-4 13-1 16-0
Hem-Fir #3 5-5 7-11 10-0 12-3
Southern Pine SS 8-1 12-9 16-10 21-6
Southern Pine #1 7-8 11-5 14-6 16-11
Southern Pine #2 6-7 9-10 12-6 14-9
Southern Pine #3 5-1 7-5 9-5 11-5
Spruce-Pine-Fir SS 7-8 12-0 15-10 19-5
Spruce-Pine-Fir #1 7-2 10-6 13-3 16-3
Spruce-Pine-Fir #2 7-2 10-6 13-3 16-3
Spruce-Pine-Fir #3 5-5 7-11 10-0 12-3
Check sources for availability of lumber in lengths greater than 20 feet.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa.
  1. Span exceeds 26 feet in length.
SEE MORE

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