Roof Rafter Measurements

Just snap a few photos of the exterior of the house with the hover app and our patented technology will take it from there.

Roof rafter measurements.

Take a direct measurement of the width of the roof. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. 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. Squaring building lines example 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.

The default heel for gambrels is 1 2 of the lower rafter plumb cut height. This must be from walls that are of equal heights. The most precise way to find the roof s slope is by measuring it from the underside. Use a level against the underside of the rafter you re measuring to get the most accurate value.

Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. Here the number is 941 86 inches. If they are not then click here for the unlevel wall rafter calculator. 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.

Use the number boxes to enter the value in feet inches and fraction inches and fraction. Here the number is 1166 66 inches. Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak. Locate the level s 12 inch mark.

Accept the default heel height and seat cut dimensions calculated by easy rafters or override the defaults by locking one or the other and entering the desired measurement. Our patented technology calculates square footage and linear measurements for the roof siding windows trim and more. It is always better to have a large rafter rather than be concerned with a sagging roof. The above spans are based on american softwood lumber standard sizes.

Use these two tables for roof rafters with a slope greater than 3 in 12. Rafter run outer wall this should be measured starting from the center of the roof span and then extending to the very edge of the exterior wall. Rafter span tables use these two tables for roof rafters with a slope of 3 in 12 or less. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.

Includes result for hip valley factor slope factor and the roof slope in degrees.