ICC Subscriptions
 
R802.4 Allowable ceiling joist spans.
Spans for ceiling joists shall be in accordance with Tables R802.4(1) and R802.4(2). For other grades and species and for other loading conditions, refer to the AF&PA Span Tables for Joists and Rafters.

TABLE R802.4(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
(feet - inches) (feet - inches) (feet - inches) (feet - inches)
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 12-8 19-11 Note a Note a
Southern pine #2 12-5 19-6 25-8 Note a
Southern pine #3 11-6 17-0 21-8 25-7
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 11-6 18-1 23-1 Note a
Southern pine #2 11-3 17-8 23-4 Note a
Southern pine #3 10-0 14-9 18-9 22-2
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


(continued)


TABLE R802.4(1)—continued 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
(feet - inches) (feet - inches) (feet - inches) (feet - inches)
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 10-10 17-0 22-5 Note a
Southern pine #2 10-7 16-8 21-11 Note a
Southern pine #3 9-1 13-6 17-2 20-3
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 10-0 15-9 20-10 Note a
Southern pine #2 9-10 15-6 20-1 23-11
Southern pine #3 8-2 12-0 15-4 18-1
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 = 0.0479kPa.
a. Span exceeds 26 feet in length.


TABLE R802.4(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
(feet - inches) (feet - inches) (feet - inches) (feet - inches)
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 10-0 15-9 20-10 Note a
Southern pine #2 9-10 15-6 20-1 23-11
Southern pine #3 8-2 12-0 15-4 18-1
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 9-1 14-4 18-11 23-1
Southern pine #2 8-11 13-6 17-5 20-9
Southern pine #3 7-1 10-5 13-3 15-8
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


(continued)


TABLE R802.4(2)—continued 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
(feet - inches) (feet - inches) (feet - inches) (feet - inches)
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 18-1 23-1
Southern pine #1 8-7 13-6 17-9 21-1
Southern pine #2 8-5 12-3 15-10 18-11
Southern pine #3 6-5 9-6 12-1 14-4
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 8-0 12-6 15-10 18-10
Southern pine #2 7-8 11-0 14-2 16-11
Southern pine #3 5-9 8-6 10-10 12-10
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 = 0.0479kPa.
a. Span exceeds 26 feet in length.