Roof Rafter Size Span

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.

Roof rafter size span.

This calculator is to be used as an estimating tool only. 1 ft 0 3048 m. Input the rafter span on the flat eave overhang and pitch of the roof. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.

Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. Dead load weight of structure and fixed loads 15 lbs ft 2. Live load 20 lbs ft 2 956 n m 2. It is always better to have a large rafter rather than be concerned with a sagging roof.

2 are indicated below. 2x4 2x6 2x8 2x10 2x12. Click the button to calculate the stock size needed for this job. 3 stud construction standard utility.

Spacing in 12 16 19 2 24. Rafter and joist span faq the lengths and sizes of joists vary depending on the species and quality of the lumber used. Floor joists ceiling joists rafters snow load rafters roof live load deflection limit. Click the button to calculate the stock size needed for this job.

1 psf lb f ft 2 47 88 n m 2. This calculator is to be used as an estimating tool only. Use our online rafter length calculator to quickly compute the length of the shed roof rafter by entering the measurements of overhead length of roof span pitch or angle. 1 in 25 4 mm.

Rafter stock size calculator. Input the rafter span on the flat eave overhang and pitch of the roof. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. Area span on the flat.

If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. Includes result for hip valley factor slope factor and the roof slope in degrees. Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.

Rafter stock size calculator. L 720 l 600 l 480 l 360 l 240 l 180.