Maximum Roof Span For 2x4

Dead load weight of structure and fixed loads 15 lbs ft 2.

Maximum roof span for 2x4.

Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. Most roof framing is 24 on center and you can still build sheds up to 14 with 2 4 rafters at 24 on center. 2 4 rafters can span up to 7. 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.

1 ft 0 3048 m. Assuming the fb of hemfir is maxxed at 1275 psi and i came up with 12 737 psf. 2x4f 2000psif 1100psie 1 8x10 2x6f 1750 psi f 950 psi f 1900 psi e 1 8x10. Spacing your 2 4 shed rafters at 24 on center limits the width of your roof.

1 psf lb f ft 2 47 88 n m 2. I used your formula backwards to calculate the max psf of a ceiling with 2x4 ceiling joists spanning 12 and spaced 24 o c. Allowable spans for 2x4 top chord trusses using sheathing other than plywood e g. Spaced sheathing or 1x boards may be reduced slightly.

Live load is weight of furniture wind snow and more. Maximum and use lumber properties as follows. For heavy loads 2x4s can span up to 5. 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.

Trusses must be designed for any special loading such as. Span calculator for wood joists and rafters also available for the android os.