How Far Apart Are Roof Rafters

All roof rafters should be identical so follow the same steps to measure the plumb cut tail cut and birdsmouth cut.

How far apart are roof rafters.

To determine how far apart to set rafters measure the width of the metal panel and then the width of the first hill and valley of the panel. Span calculator for wood joists and rafters also available for the android os. We ll be building a 4 12 pitch roof with an 8 span with 1 of overhang. This total span is well within the load capacity of 2 4 rafters but how far apart can we space the rafters.

Calculate the length of your rafters. A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel. Should i use 2 4 or 2 6 rafters for shed roof. Other relevant factors include the type of wood being used for the rafters the size of the rafters and the load that the rafters need to support.

With this set of specs we are looking at a rafter length of 5 3. Wider panels allow for greater spacing between rafters. For more information see our disclosures here. Also available for the android os.

Therefore if you want a 10 12 single sloped roof and you live in a heavy snow area then you can space your rafters 16 apart and use spf 2 6 lumber. 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. Depending on the size of your structure you will need to cut several or many more. You should use 2 4 rafters if you live in an area without heavy snow or wind loads.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. This post may contain affiliate links. 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. At this point you ve cut 1 roof rafter.

The spacing between rafters in a given building is part of the engineering calculations that determine the required structure of the roof. 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. Repeat the process for your other rafters.