Hip Roof Framing Purlins

Hip roofs have hip rafters which are oriented diagonally to the ridge and outside walls.

Hip roof framing purlins.

Now draw the centerlines for all rectangles that are formed inside. First of all you need to design the layout of building. Hip and valley roof framing is no so complex as compared to hip roof framing procedures. Purlins are not required or needed unless rafters are overspanned and then the purlins serve as support to prevent roof sag deflection due to the overspanned and or undersized rafters.

This series covers roof framing roofing materials the attic and the conditions that affect the roofing materials and components including wind and hail. Minus ridge thickness to allow for ridge becoming pole plate roof peak will be slightly higher ridge thick must be same. Hip rafter ratio length multiplier hrrlm 18 12 1 5 common rafter length multiplier crlm 13 4164 12 1 11803. Stabilization typically involves installation of a purlin system.

Now outline the biggest rectangle inside the building layout. Here roofs are constructed with an angle of 90 degrees. Divide the rafter length by 12 of run to calculate the roof ratio multiplier. 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 common rafter length can be calculated by the roof ratio length per 12 of run. Roof framing geometry kernel rafter lengths roof ratio multiplier.