How To Frame Gable Roofs 11

Calculating Gable End Stud Lengths And Adjustments

Calculate the theoretical stud length of the longest stud as shown on figure 42. Measure the distance from the outside face of the wall to the centre of the stud. Divide the distance by the unit run to find the number of units of run. Multiply the number of units of run by the unit of rise to get the theoretical stud length. If the distance to the centre of the stud from the outside wall face is 1200 mm and the unit run is 250 mm, the number of run units is 1200 mm divided by 250 mm = 4.8. If the unit rise is 150 mm, the theoretical line length will be 4.8 times 150 mm =  720 mm. The theoretical gable end stud length at its centre is the distance between rafter line length and top plate.

The theoretical gable end stud length must be adjusted for the rafter and top plate. The vertical depth of the birdsmouth and sloping top plate must be subtracted and cut from the stud length as shown in figure 42.

Figure 42  Theoretical Gable End Stud Length And Stud Length Adjustment For Rafters And Top Plate

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1.Framing Gable Roofs: Roof Framing Is Based On The Pythagorean Theorem.
2.Framing Gable Roofs: Layout The Ceiling Joists.
3.Framing Gable Roofs: Cut The Ceiling Joist To The Slope Of The Rafter.
4.Framing Gable Roofs: Gable Roof Components.
5.Framing Gable Roofs: Calculate The Length Of A Common Rafter.
6.Framing Gable Roofs: Mark Plumb Lines For Ridge, Birdsmouth And Overhang.
7.Framing Gable Roofs: Adjust The Rafter To The Size Of The Ridge Board.
8.Framing Gable Roofs: Layout & Cut The Rafter Birdsmouth.
9.Framing Gable Roofs: Calculate Length Of The Rafter Overhang & Cut Excess.
10.Framing Gable Roofs: Layout The Collar Ties.
11.Framing Gable Roofs: Calculate The Gable End Stud Lengths & Adjustments.
12.Framing Gable Roofs: Calculate Gable End Stud Length By Ratio & Proportion.

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Written and maintained by
Ronald Hunter

All images and text are copyright Ronald Hunter 2005 to 2011