This sizing guide for roof rafters will help determine what you need for your small project.
Gable roof size.
10 add up the areas of each section to get your total square footage.
Total roof width with rake overhangs.
Length from ridge to eave.
In making your choice consider how you will insulate your insulate your roof.
Outside of the u s a degree angle is typically used.
The table states that 2 x 6 rafters spaced 16 inches on center o c can span a maximum distance of 13 feet 5 inches.
Measure out horizontally 12 one foot from the gable end sloping trim to a point along horizontal siding or use your level to make a mark that is level horizontally measured out 12 from the sloped gable trim or roof edge.
Gable roof framing calculator plan diagram with full dimensions for a good straight fascia add an extra inch or 2 to the tails of all your rafters total length.
Rafter plumb cut depth.
Another option are 2 x 8 rafters spaced 24 inches o c.
There are several variables to consider when determining the proper rafter size.
Gable roof a gable roof has two opposite sides with equal slopes and equal spans that meet in the center of the roof at the ridge.
After they re up you can snap a line to mark and trim the tails in a nice straight line to make up for any ridge warp or marking cutting and fixing errors.
For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.
Measure and mark the square footage of each triangular section carefully as these tend to differ in size.
Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter.
Total rafter lumber length.
Check that your footage measurements are within this range so you can start off on the right foot.
Use the saltbox roof to calculate a two sided roof with different slopes spans and or overhangs for each side of the roof.