Roof Rafter Size Span

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.

Roof rafter size span.

Live load is weight of furniture wind snow and more. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. Spacing in 12 16 19 2 24.

It is always better to have a large rafter rather than be concerned with a sagging roof. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. 1 ft 0 3048 m. Includes result for hip valley factor slope factor and the roof slope in degrees.

1 in 25 4 mm. This calculator is to be used as an estimating tool only. Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. 1 psf lb f ft 2 47 88 n m 2.

This calculator is to be used as an estimating tool only. Floor joists ceiling joists rafters snow load rafters roof live load deflection limit. 2 are indicated below. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.

For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine. Click the button to calculate the stock size needed for this job. 2x4 2x6 2x8 2x10 2x12. 3 stud construction standard utility.

Rafter stock size calculator. L 720 l 600 l 480 l 360 l 240 l 180. Area span on the flat. Rafter length using angle v r 2cos a rafter length using pitch v r 2 sqrt 1 p 2 where v overhang r roof span p pitch.

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. Input the rafter span on the flat eave overhang and pitch of the roof. Rafter and joist span faq the lengths and sizes of joists vary depending on the species and quality of the lumber used. Click the button to calculate the stock size needed for this job.

Rafter stock size calculator. Dead load weight of structure and fixed loads 15 lbs ft 2.