Maximum Roof Span For 2x4

Also available for the android os.

Maximum roof span for 2x4.

2 4 rafters can span up to 7. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. I used your formula backwards to calculate the max psf of a ceiling with 2x4 ceiling joists spanning 12 and spaced 24 o c. 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.

1 ft 0 3048 m. Maximum and use lumber properties as follows. 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.

Trusses must be designed for any special loading such as. Spaced sheathing or 1x boards may be reduced slightly. Live load is weight of furniture wind snow and more. Span calculator for wood joists and rafters also available for the android os.

For heavy loads 2x4s can span up to 5. Allowable spans for 2x4 top chord trusses using sheathing other than plywood e g. 2x4f 2000psif 1100psie 1 8x10 2x6f 1750 psi f 950 psi f 1900 psi e 1 8x10. Assuming the fb of hemfir is maxxed at 1275 psi and i came up with 12 737 psf.

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.