Low Pitch Roof Rafters

A low pitched roof is anything that is any roof with a pitch of 3 12 or less.

Low pitch roof rafters.

The roof pitch calculator is a convenient online tool you can use to quickly assess the pitch of your roof to determine the length of rafters you need. More commonly roll on membranes such that use heat to bond seams together is used as a roofing material. This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof. 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.

Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. This horizontal load or thrust can be considerable especially on a low pitched roof. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. To resist thrust the irc calls for a structural ridge required for any roof with a pitch less than 3 12 or for each pair of rafters to be securely connected to each other by a continuous ceiling joist r802 3 2006 irc.

After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually. 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.