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// CODE SNIPPET

R802.4 Allowable Ceiling Joist Spans

Residential Code 2012 of South Holland > 8 Roof-Ceiling Construction > R802 Wood Roof Framing > R802.4 Allowable Ceiling Joist Spans
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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
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.
  1. 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
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.
  1. Span exceeds 26 feet in length.

Related Code Sections


R802.4 Roof-Ceiling Construction, 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 ...
Residential Code 2012 of South Holland > 8 Roof-Ceiling Construction > R802 Wood Roof Framing > R802.4 Allowable Ceiling Joist Spans
Chapter 8 Roof-Ceiling Construction
framing systems: wood framing and cold-formed steel framing. Allowable span tables are provided to simplify the selection of rafter and ceiling joist ...
Residential Code 2018 of South Holland > 8 Roof-Ceiling Construction
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bearing supports shall be located within 24 inches (610 mm) of midspan of the ceiling joist, and the individual spans shall not exceed the applicable ...
Residential Code 2018 of South Holland > 8 Roof-Ceiling Construction > R804 Cold-Formed Steel Roof Framing > R804.3 Roof Construction > R804.3.1 Ceiling Joists
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R804.3.1.1(8). When determining the size of ceiling joists, the lateral support of the top flange shall be classified as unbraced, braced at mid-span ...
Residential Code 2012 of South Holland > 8 Roof-Ceiling Construction > R804 Steel Roof Framing > R804.3 Roof Construction > R804.3.1 Ceiling Joists
2308.10.2 Wood, Ceiling Joist Spans
Allowable spans for ceiling joists shall be in accordance with Table 2308.10.2(1) or 2308.10.2(2). For other grades and species, refer to the AF ...
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