Framing Hip Roof With Different Pitches

The pitch of the unequal hip rafter can be expressed in relation to either the main roof or the secondary roof.

Framing hip roof with different pitches.

Learn more about off angle roof framing. A dutch hip roof is a combination of both the hip roof and gable roof features. 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.

The gable portion of a dutch hip roof is usually placed at the end of the roof ridge and sits on top of the plane of the hip roof. Select the following information by using the drop downs to enter values in feet and inches. First of all you need to design the layout of building. Here roofs are constructed with an angle of 90 degrees.

Now draw the centerlines for all rectangles that are formed inside. For example in an equal hip roof with an 8 12 pitch the pitch of the hip rafter would be 8 17. Modern residential hip roof construction uses common pitch ratios in general. 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.

Enter the extension wall length into wall length and double the extension wall width then minus ridge thickness into the wall width entries. Porch roof extensions for hip roof porch extensions from an existing building wall you can use half the calculator results. Now outline the biggest rectangle inside the building layout. 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.

Minus ridge thickness to allow for ridge becoming pole plate roof peak will be slightly higher ridge thick must be same. A sketchup model helps clarify how various rafters and framing components are assembled in an off angle hip and valley configuration. It is sometimes also referred to as a dutch gable roof precisely because it contains both roof style features.