Hip Roof Framing Purlins

Photo above is from a jwk inspections framing pre drwall inspection in the san antonio south teaxas area showing the actual roof framing componenents.

Hip roof framing purlins.

Now outline the biggest rectangle inside the building layout. Here roofs are constructed with an angle of 90 degrees. Hip rafters are. Divide the rafter length by 12 of run to calculate the roof ratio multiplier.

Hip roofs have hip rafters which are oriented diagonally to the ridge and outside walls. Hip and valley roof framing is no so complex as compared to hip roof framing procedures. Porch roof extensions for hip roof porch extensions from an existing building wall you can use half the calculator results. First of all you need to design the layout of building.

Enter the extension wall length into wall length and double the extension wall width then minus ridge thickness into the wall width entries. Roof framing geometry kernel rafter lengths roof ratio multiplier. Now draw the centerlines for all rectangles that are formed inside. All angles can be found on the chappell univer.

The common rafter length can be calculated by the roof ratio length per 12 of run. Stabilization typically involves installation of a purlin system. 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.