Gable Roof Rafter Framing

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.

Gable roof rafter framing.

And the line length measurement from the roof peak to the building wall is the hypotenuse. Use 8 penny nails to attach the first 2 in 4 in 5 1 cm 10 2 cm board to the wall studs. 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. Ladder trusses are made up using four noggins bridging at each corner to support a rafter outside the building.

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. Framing the gable ends 1 nail 2 boards onto your walls as top plates. Gable roof framing calculator plan diagram with full dimensions.

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. The only laudable smartphone app for unequal pitched gable roofs that will give the correct length of the rafters is rafter tools for android. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. But a gable roof also requires some form of horizontal.

Deducting 1 2 the thickness of the ridge for the rafter framing lengths for unequal pitched roofs is wrong. The roof rafters provide integral structural support to the roof. The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit 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. Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter. The run or half the building span is the base of the triangle.