Gable Roof Rafter Framing

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

Gable roof rafter framing.

Gable roof framing calculator plan diagram with full dimensions. Use 8 penny nails to attach the first 2 in 4 in 5 1 cm 10 2 cm board to the wall studs. After the gable is framed lookouts extend from the first rafter inside the gable wall out over the plates to support the overhanging barge rafter. For a good straight fascia add an extra inch or 2 to the tails of all your rafters total length.

In conventional gable roof framing the slope of the roof is formed by rafters that run diagonally downward from the peak of the roof to the tops of the exterior walls of the building. The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. The only laudable smartphone app for unequal pitched gable roofs that will give the correct length of the rafters is rafter tools for android. After they re up you can snap a line to mark and trim the tails in a nice straight line to make up for any ridge warp or marking cutting and fixing errors.

Ladder trusses are made up using four noggins bridging at each corner to support a rafter outside the building. Framing a dropped gable wall one of the keys to framing the rake with my system is building a dropped gable end wall the top of which is 3 1 2 inches below the tops of the rafters. Framing the gable ends 1 nail 2 boards onto your walls as top plates. Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter.

Deducting 1 2 the thickness of the ridge for the rafter framing lengths for unequal pitched roofs is wrong. But a gable roof also requires some form of horizontal. Framing a gable roof building a gable with barge end purlin struts and collar ties the picture above shows the plan view of a gable roof. And the line length measurement from the roof peak to the building wall is the hypotenuse.

The run or half the building span is the base of the triangle. If you re framing a gable roof on a new house or building a shed or even a doghouse with a gable roof you ll need to cut a number of roof rafters. The rise or height of the roof at its peak is the altitude of the triangle.