Gable Roof Framing Without Ceiling Joists

A standard triangular roof known as a gable roof is framed using rafters which are diagonal members that support the roofing materials.

Gable roof framing without ceiling joists. With no posts under the hip or ridge would it want to kick out and the ridge go down. The standard construction of interior framing in a home uses 16 inch on center oc spacing for ceiling joists. How can i remove the ceiling joists without allowing the ridge to sag or the walls to bow out. Joist spacing in this design mode incorporates different types of wood used in ceiling construction including 2 grades of southern pine douglas fir and hemlock fir types which are the most common.

This article describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings including definitions of collar ties rafter ties and structural ridge beams. The plans for a house i am building call for a great room with a cathedral ceiling. Along the eaves walls and 20 ft. Across the gable end.

The shape and size of a roof depends on the span and the floor. Some of these can support the roof and prevent ridge sagging and wall spreading. Collar ties rafter ties tension beams structural ridge beams. A gable roof is a heavy structure and if you want to prevent your roof from collapsing you ll have to frame the structure correctly.

A gable roof consists of two upward sloping sides that slope at the same angle and from the end look like a symmetrical triangle. How to frame a gable roof with no ceiling. Where ceiling joists are used to provide resistance to rafter thrust lapped joists shall be nailed together in accordance with table r802 5 1 9 in the irc. Gable roofs without ceiling joists provide a much higher and triangular shaped ceiling inside the home.

I know you can do it with a gable having a structural ridge supported on each end but what about a hip. For example if a house has a 4 12 slope the rafters are on 16 inch centers the snow load is 30 psf and the roof span is 28 feet you need eight 16d common nails or 40d box nails at.