SECTION R507  EXTERIOR DECKS
Pursuant to the UCC, delete Table R507.6 and replace as follows:
TABLE R-R507.6
DECK JOIST SPANS FOR COMMON LUMBER SPECIES (ft. - in.)
 
SPECIESa
SIZE
ALLOWABLE JOIST SPANb
MAXIMUM CANTILEVER c, f
SPACING OF DECK JOISTS
(inches)
SPACING OF DECK JOISTS WITH CANTILEVERSc(inches)
12
16
24
12
16
24
Southern Pine
2 X 6
9-11
9-0
7-7
1-3
1-4
1-6
2 X 8
13-1
11-10
9-8
2-1
2-3
2-5
2 X 10
16-2
14-0
11-5
3-4
3-6
2-10
2 X 12
18-0
16-6
13-6
4-6
4-2
3-4
Douglas fir-larch d, hem-fir d, spruce- pine-fir d
2 X 6
9-6
8-8
7-2
1-2
1-3
1-5
2 X 8
12-6
11-1
9-1
1-11
2-1
2-3
2 X 10
15-8
13-7
11-1
3-1
3-5
2-9
2 X 12
18-0
15-9
12-10
4-6
3-11
3-3
Redwood, western cedars, ponderosa pine e, redpine e
2 X 6
8-10
8-0
7-0
1-0
1-1
1-2
2 X 8
11-8
10-7
8-8
1-8
1-10
2-0
2 X 10
14-11
13-0
10-7
2-8
2-10
2-8
2 X 12
17-5
15-1
12-4
3-10
3-9
3-1
 
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg.
a.   No. 2 grade with wet service factor.
b.   Ground snow load, live load = 40 psf, dead load = 10 psf, L/ = 360. 372
c.   Ground snow load, live load = 40 psf, dead load = 10 psf, L/ = 360 at main span, L/ = 180 at cantilever with a 220-pound point load applied to end. 373
d.   Includes incising factor.
e.   Northern species with no incising factor.
f.   Cantilevered spans not exceeding the nominal depth of the joist are permitted.

 

Notes

372
   Enrolled bill read "L/"; corrected by Code editor.
373
   Enrolled bill read "L/"; corrected by Code editor.