Maximum Roof Span For 2x4

Maximum and use lumber properties as follows.

Maximum roof span for 2x4.

For heavy loads 2x4s can span up to 5. I used your formula backwards to calculate the max psf of a ceiling with 2x4 ceiling joists spanning 12 and spaced 24 o c. 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. Also available for the android os. 2 are indicated below. Dead load weight of structure and fixed loads 15 lbs ft 2.

For light load roofs 24 o c. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. Trusses must be designed for any special loading such as. 1 psf lb f ft 2 47 88 n m 2.

Most roof framing is 24 on center and you can still build sheds up to 14 with 2 4 rafters at 24 on center. 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. Assuming the fb of hemfir is maxxed at 1275 psi and i came up with 12 737 psf. 1 ft 0 3048 m.

Allowable spans for 2x4 top chord trusses using sheathing other than plywood e g. 2 4 rafters can span up to 7.