Hip Roof Unequal Pitch

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 roof unequal pitch. Use the main hr miter line shift dimension tail of hr 1 5 16 in to draw a line parallel with the hr miter line. The pitch of the unequal hip rafter can be expressed in relation to either the main roof or the secondary roof. Repeat the process on the adjacent pitch side of the hip rafter using adjacent hr miter line shift dimension tail of hr 1 in. Blind valleys simplify framing 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.

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. One of users asked us to create calculator which will help him estimate hip roof parameters like rafter s lengths roof rise and roof area. Major side roof pitch major. Major side plan angle.

The most common parameter is to maintain an equal ridge height over building sections with differing spans. All formulae are below the calculator. 62 is shown the manner in which the method represented in fig. Draw the line a b in length equal to the runs of the common rafters on both the long and short sides of the hips.

Minor side roof pitch minor. Major side roof span building width ridge thickness 2. Slope of hip end roof. Select the following information by using the drop downs to enter values in feet and inches.

For example in an equal hip roof with an 8 12 pitch the pitch of the hip rafter would be 8 17. To maintain a consistant ridge height in these situations the roof pitch must be adjusted. Value must be greater than zero. 58 may be varied to meet the requirements of roofs of unequal pitches.