• Codes
  • Features
  • Pricing
  • Sign Up
  • Log in
Log in
Sign Up
  • Code Library
  • Features
  • Pricing
  • About
  • Careers
  • Contact
  • Terms
  • Privacy
// CODE SNIPPET

R802.4 Allowable Ceiling Joist Spans

Residential Code 2015 of Utah > 8 Roof-Ceiling Construction > R802 Wood Roof Framing > 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 AWC STJR.

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 11-1 16-3 20-7 25-2
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 23-4 Note a
Douglas fir-larch #3 9-7 14-1 17-10 21-9
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 23-10 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


(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 16-8 21-4 26-0
Douglas fir-larch #3 8-9 12-10 16-3 19-10
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 15-0 19-1 23-3
Douglas fir-larch #3 7-10 11-6 14-7 17-9
Hem-fir SS 9-10 15-6 20-5 Note a
Hem-fir #1 9-8 15-2 19-10 24-3
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.
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 15-0 19-1 23-3
Douglas fir-larch #3 7-10 11-6 14-7 17-9
Hem-fir SS 9-10 15-6 20-5 Note a
Hem-fir #1 9-8 15-2 19-10 24-3
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 8-11 13-0 16-6 20-2
Douglas fir-larch #3 6-10 9-11 12-7 15-5
Hem-fir SS 8-11 14-1 18-6 23-8
Hem-fir #1 8-9 13-7 17-2 21-0
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


(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 23-7
Douglas fir-larch #1 8-7 12-6 15-10 19-5
Douglas fir-larch #2 8-2 11-11 15-1 18-5
Douglas fir-larch #3 6-2 9-1 11-6 14-1
Hem-fir SS 8-5 13-3 17-5 22-3
Hem-fir #1 8-3 12-4 15-8 19-2
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 17-2 21-3
Douglas fir-larch #1 7-8 11-2 14-2 17-4
Douglas fir-larch #2 7-3 10-8 13-6 16-5
Douglas fir-larch #3 5-7 8-1 10-3 12-7
Hem-fir SS 7-10 12-3 16-2 20-6
Hem-fir #1 7-7 11-1 14-0 17-1
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.
a. Span exceeds 26 feet in length.
Share URL

Copy and paste the link below into emails, chats or browsers.

Copy

You can also copy or bookmark the link from your browser's address bar.

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 2015 of Utah > 8 Roof-Ceiling Construction > R802 Wood Roof Framing > R802.4 Allowable Ceiling Joist Spans
R804.3.1 Roof-Ceiling Construction, Ceiling Joists
R804.3.1.1(2) CEILING JOIST SPANS 20 PSF LIVE LOAD (LIMITED ATTIC STORAGE) a, b, c MEMBER DESIGNATION ALLOWABLE SPAN (feet - inches ...
Residential Code 2015 of Utah > 8 Roof-Ceiling Construction > R804 Cold-Formed Steel Roof Framing > R804.3 Roof Construction > R804.3.1 Ceiling Joists
R502.3 Floors, Allowable Joist Spans
not exceed 20 pounds per square foot (0.96 kPa). The allowable span of ceiling joists that support attics used for limited storage or no storage ...
Residential Code 2015 of Utah > 5 Floors > R502 WOOD FLOOR FRAMING > R502.3 Allowable Joist Spans
2308.7.1 Wood, 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 ...
Building Code 2015 of Utah > 23 Wood > 2308 Conventional Light-Frame Construction > 2308.7 Roof and Ceiling Framing > 2308.7.1 Ceiling Joist Spans
2306.1.1 Wood, Joists and Rafters
The design of rafter spans is permitted to be in accordance with the AWC STJR ...
Building Code 2015 of Utah > 23 Wood > 2306 Allowable Stress Design > 2306.1 Allowable Stress Design > 2306.1.1 Joists and Rafters
About UpCodes

UpCodes provides an intuitive resource to navigate building regulations.

Codes are organized by jurisdiction to help you understand which regulations apply to your project.


Find Your Codes
COMPANY INFO About Free Law Contact Careers Terms Privacy Press Kit
CATEGORY General New York City New York State California Codes Building Codes Online
PREMIUM Features Pricing Sign Up Log In
CODES IBC 2015 IRC 2015 IPC 2015 California Building Code 2016 Popular Sections
FOLLOW US