Under Slope Enter or select the slope of the main roof. Width Enter the width of the blind valley. If the blind valley is to meet up with an intersecting roof then this measurement is the width at the point the intersecting roof meets the main roof and should take into account differences in wall heights, sheathing thickness on the main roof, and any other variables that could affect the dimensions of the blind valley.
Rafter Spacing Select an on center spacing from the dropdown list. There is no layout drawing for the Blind Valley, but this measurement is used to to calculate the common difference which is displayed on the Longest Jack drawing tab. Repeat, the horizontal distance covered , not the length , of a common rafter.
For precision, the thickness of the ridge board and any eave overhang should be taken into account when determining the run. The hip and valley factor varies according to the slope of the roof, as shown in the table below. Divide the rise by the run the run is Square the result. The internal roof lines are called valleys and the external roof lines are the hips as shown. As you can see, the 2 lines to the top left of the image are just drawn in approximately.
We will determine there length in the next step. All the other lines making up the hips can be calculated by joining them where they intersect. The exact point can be calculated by drawing a point half the width of the wall, across, and up. In this example, the wall of mm 3 metres would have a point mm 1. In this step, I have drawn in some dashed lines.
The 45 degree angle lines represent the hips. The other 2 lines the horizontal and vertical line are there to make an imaginary box. These lines help to show you where to start the hips from. This is a good method for working out roof designs. I always try and work out pieces of the roof into rectangles or squares to aid in working out roof line placement. In this step, I have drawn in the hip purple colour from the previous steps working out, and also deleted the temporary dashed lines from the previous step.
In this step, we have again drawn in the temporary lines of the hips and the vertica and horzontal lines for the imaginary box.
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It is called Get House Date www.
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