Pitch Table Roof Rafters

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.

Pitch table roof rafters.

The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. 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. Floor beam span tables of residential structural design we will now look at roof rafter and beam 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.

Continuing on from part 3. 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 pitches are given in rise in run rise over run and in degrees. This table shows the roof pitch multiplier also called the roof pitch factor for typical roof slopes used to find the area of sloped roofs or the lengths of common rafters.

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. Let s consider a basic gable wood roof framing design. 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. 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.