Maximum Roof Span For 2x4

1 psf lb f ft 2 47 88 n m 2.

Maximum roof span for 2x4.

Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. 1 ft 0 3048 m. For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2. 2 are indicated below.

Most roof framing is 24 on center and you can still build sheds up to 14 with 2 4 rafters at 24 on center. 2x4f 2000psif 1100psie 1 8x10 2x6f 1750 psi f 950 psi f 1900 psi e 1 8x10. I used your formula backwards to calculate the max psf of a ceiling with 2x4 ceiling joists spanning 12 and spaced 24 o c. Spacing your 2 4 shed rafters at 24 on center limits the width of your roof.

Spaced sheathing or 1x boards may be reduced slightly. 2 4 rafters can span up to 7. While every effort has been made to insure the accuracy of the information presented and special effort has been made to assure that the information reflects the state of the art neither the west coast lumber inspection bureau the american wood council nor its members assume any responsibility for any particular design prepared from this online span calculator. Span calculator for wood joists and rafters also available for the android os.

Trusses must be designed for any special loading such as. Live load is weight of furniture wind snow and more. Dead load weight of structure and fixed loads 15 lbs ft 2. Allowable spans for 2x4 top chord trusses using sheathing other than plywood e g.

For heavy loads 2x4s can span up to 5. For light load roofs 24 o c.