How Far Apart Roof Rafters

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.

How far apart roof rafters.

Should i use 2 4 or 2 6 rafters for shed roof. Rafters rest on the top wall plate. They are inclined members spaced from 16 to 48 inches apart. This total span is well within the load capacity of 2 4 rafters but how far apart can we space the rafters.

The roof rafters provide integral structural support to the roof. Also available for the android os. Span calculator for wood joists and rafters also available for the android os. Wider panels allow for greater spacing between rafters.

With this set of specs we are looking at a rafter length of 5 3. 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. 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. A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel.

This post may contain affiliate links. We ll be building a 4 12 pitch roof with an 8 span with 1 of overhang. 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. Calculate the length of your rafters.

The spacing between rafters in a given building is part of the engineering calculations that determine the required structure of the 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. Rafters are nailed to the plate. They vary in size depending on length and spacing.

An essential part of planning a patio roof or gazebo project is determining the number size and spacing of rafters beams and posts according to the loads they will carry. Rafters rafters make up the main framework of all roofs. For more information see our disclosures here. Patio roof maximum beam rafter spans.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. You should use 2 4 rafters if you live in an area without heavy snow or wind loads. Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter.