// CODE SNIPPET
R802.4 Allowable Ceiling Joist Spans
JUMP TO FULL CODE CHAPTER
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.
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.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479kPa.
- Span exceeds 26 feet in length.
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.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479kPa.
- 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 ...
R804.3.1 Roof-Ceiling Construction, Ceiling Joists
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
R804.3.1 Roof-Ceiling Construction, Ceiling Joists
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 ...
Building Code 2012 of South Holland > 23 Wood > 2308 Conventional Light-Frame Construction > 2308.10 Roof and Ceiling Framing > 2308.10.2 Ceiling Joist Spans