Pitched Roof Rafters

Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.

Pitched roof rafters. If you look at the rafter span chart you ll notice that 2x4s can be used for rafters on spans up to 11. To cut roof rafters start by fixing the stair gauges on your framing square to the dimensions of your pitch. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Roof pitch calculator results explained.

To see how pitch impacts the look of a garage and changes cost click the design center button on our pole barn kits page. The pitch and span of your roof will dictate how long of a rafter you ll need use maximum span calculator to help you find your rafter size. When talking about framing a shed roof with rafters you ll first need to know how steep your roof is in other words what is the pitch or slope of your roof. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof.

Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. Roof rafters and shed roof pitch. Angle the angle of a roof is the same as the roof s slope except instead of being. As a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes.

Slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run this is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Next set the framing square on top of the rafter beam and use a pencil to trace the outside edge of the framing square s tongue. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Roofs with a slope less than 3 12 and roofs greater than 3 12.

Most rafter span charts are organized into 2 sections. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Roof pitch refers to the amount of rise a roof has compared to the horizontal measurement of the roof called the run. 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.