Maximum Roof Span For 2x4

2 are indicated below.

Maximum roof span for 2x4.

Allowable spans for 2x4 top chord trusses using sheathing other than plywood e g. 2 4 rafters can span up to 7. For heavy loads 2x4s can span up to 5. Spaced sheathing or 1x boards may be reduced slightly.

1 ft 0 3048 m. Trusses must be designed for any special loading such as. Spacing your 2 4 shed rafters at 24 on center limits the width of your roof. 2x4f 2000psif 1100psie 1 8x10 2x6f 1750 psi f 950 psi f 1900 psi e 1 8x10.

1 psf lb f ft 2 47 88 n m 2. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. Live load is weight of furniture wind snow and more. Dead load weight of structure and fixed loads 15 lbs ft 2.

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. Also available for the android os. For light load roofs 24 o c. I used your formula backwards to calculate the max psf of a ceiling with 2x4 ceiling joists spanning 12 and spaced 24 o c.

Span calculator for wood joists and rafters also available for the android os. Assuming the fb of hemfir is maxxed at 1275 psi and i came up with 12 737 psf.