Floor joist -40 psf live load,10 psf dead load,=L/360

All rooms except sleeping rooms and attic floors

Size

12" o.c.

16" o.c.

2 x 10 #2 Southern Pine

18'-0"

16'-1"

2 x 10 #3 Southern Pine

14'-0"

12'-2"

Floor joist -30 psf live load, 10 psf dead load, = L/360

Sleeping rooms and attic floors, does not include waterbeds

Size

12" o.c.

16" o.c.

2 x 10 #2 Southern Pine

19'-10"

15'-8"

2 x 10 #3 Southern Pine

18'-0"

13'-7"

Ceiling joist 20# live load, 10#dead load =L/240

Use these loading conditions for the following , limited attic storage where the development of future rooms is not possible.Ceilings where the roof pitch is steeper than 3 in 12.
Where the clear height in the attic is greater than 30". Drywall ceilings.

Size

12" o.c.

16" o.c.

2 x 8 #2 spf (south)

17'-5"

15'-1"

2 x 8 #3 spf (south)

13'-1"

11'-4"

Roof rafters 20# live load 7# dead load = L/180

No snow load roof pitch greater than 3 in 12 light roof covering no ceiling finish

Size

12" o.c.

16" o.c.

2 x 6 #2 spf (south)

15'-0"

11'-5"

2 x 6 #3 spf (south)

12'-2"

10'-7"

2 x 8 #2 spf (south)

19'-10"

17'-9"

2 x 8 #3 spf (south)

15'-5"

13'-4"