Irregular Hip Roof Framing

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Irregular hip roof framing.

One of the strongest ways to frame a roof is using a hip roof design. This type of roof is also called broken back hip and valley roof because the main hips are intconeected by the rafter of gables on one side and the rafter of the valley on the other. Irregular hip framing formulas variables major pitch minor pitch major run jack rafter spacing formulas eave angle 90 major pitch angle atan major pitch 12 minor pitch angle atan minor pitch 12 minor run major pitch minor pitch major run major plan angle arctan minor pitch major pitch minor plan angle arctan major pitch minor pitch hip pitch angle arctan tan major pitch angle sin major plan angle major pitch hip backing. The planes of the roof slope up from every side so the framing braces the roof from all sides.

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. The ridge board is centered here in terms of length as well as width. Minus ridge thickness to allow for ridge becoming pole plate roof peak will be slightly higher ridge thick must be same.

When framing irregular hip valley roofs the h v rafter members are not equally split by the sheathing lines. Such buildings may have more than four hips in the roofs and they form valleys at the inside corners. Most roof eave angle corners are at 90. If the building is square and the sides are of equal length the roof planes will meet at a point as in a pyramid.

Mark 3 perpendicular lines on the top edge of the hip rafter using these dimensions. As compared to global roof framing hip roof framing is more difficult because it consists of four sides with variable lengths instead of two sides. Hip roofs can be generally framed into a large variety of sizes that can be t or l shaped and may need a more complex frame structure. Select the following information by using the drop downs to enter values in feet and inches.

Roof eave angle this is the corner angle of the building. Framing angle hip roof drawings. Hip roof roof deck backyard gazebo pergola porch extension framing construction roof shapes roof lantern carpentry projects. A hip and valley roof may be part of an irregular structure.

Next click on the hip angles button and then click on the hip valley rafter slope angle text.