Pitch Table Roof Rafters

Roof pitches are given in rise in run rise over run and in degrees.

Pitch table 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. 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. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. Here we have a wood framed gable roof.

The table will provide full scale the full scale number will be the length of the rafter in inches for each foot of horizontal run distance. Angle the angle of a roof is the same as the roof s slope except instead of being. 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. 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.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Floor beam span tables of residential structural design we will now look at roof rafter and beam design. Let s consider a basic gable wood roof framing design. The rafter tables allow you to calculate the length of a rafter by choosing a full scale number that matches the unit rise slope or angle of the roof.