The hip roof framing calculator returns the value of the main rafter the side rafter the length of the hip the height of the knee wall and the lengths of the jack rafters.
Hip rafters with different roof pitches.
If you re framing a gable roof on a new house or building a shed or even a doghouse with a gable roof you ll need to cut a number of roof rafters.
In a hip roof with equal pitches the unit run of a hip or valley rafter is 17 inches for every 12 inches of run in the main roof.
A sketchup model helps clarify how various rafters and framing components are assembled in an off angle hip and valley configuration.
But here it will be different since the hip rafter doesn t lie at 45 degrees to the commons.
Blind valleys simplify framing.
Pitched roof rafter lengths for gable hip lean to roof construction how to calculate the length of common roof rafters you are ready to set out and cut the common rafter lengths as soon as the wall plates have been squared levelled and fixed strapped down onto the brickwork.
Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter.
Select the following information by using the drop downs to enter values in feet and inches.
A hip roof or a hipped roof is a style of roofing that slopes downwards from all sides to the walls and hence has no vertical sides.
Modern residential hip roof construction uses common pitch ratios in general.
The roof rafters provide integral structural support to the roof.
For example in an equal hip roof with an 8 12 pitch the pitch of the hip rafter would be 8 17.
While the slope of the common rafters are expressed as x in 12 the slope of the hip and valley rafter on the same roof will be x in 16 97 so where two roof sections intersect to form a 90 angle a regular hip or valley and each roof.
Unit run of the hip.
Using a pitch measuring tool that i d made we also determined that the exact pitch of the shed roof was 3 1 2 in 12.
Learn more about off angle roof framing.
Explore framing complexities that result when roofs of two different pitches intersect.
To keep the porch roof framing as simple as possible we installed a structural ridge supported by posts at each end with the common rafters landing on top of the ridge.
The most common hip roof pitch ratios fall between 4 12 and 6 12 although variations occur based on factors such as snow rain and wind conditions which is because steeper hip roof pitch ratios allow for less accumulations of snow and rain on the roof and lower ratios provide less wind resistance.
