Maximum Roof Span For 2x4

For heavy loads 2x4s can span up to 5.

Maximum roof span for 2x4.

Span calculator for wood joists and rafters also available for the android os. Most roof framing is 24 on center and you can still build sheds up to 14 with 2 4 rafters at 24 on center. Trusses must be designed for any special loading such as. For light load roofs 24 o c.

Spacing your 2 4 shed rafters at 24 on center limits the width of your roof. Allowable spans for 2x4 top chord trusses using sheathing other than plywood e g. 1 ft 0 3048 m. I used your formula backwards to calculate the max psf of a ceiling with 2x4 ceiling joists spanning 12 and spaced 24 o c.

Assuming the fb of hemfir is maxxed at 1275 psi and i came up with 12 737 psf. Also available for the android os. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. Spaced sheathing or 1x boards may be reduced slightly.

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. Maximum and use lumber properties as follows. 2 4 rafters can span up to 7.

2x4f 2000psif 1100psie 1 8x10 2x6f 1750 psi f 950 psi f 1900 psi e 1 8x10. 2 are indicated below.