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Presentation 26:

HIP RAFTER LAYOUT

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Hip Rafter Layout Lines

• There are many layout lines on a hip rafter.

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Hip Rafter Layout Lines

• These lines are added one line at a time.

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Hip Layout for Ridge

• Draw ridge plumb line.

• This is not the cut line.

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Hip Layout for Ridge

• Rafter must be shortened for the ridge.

• Shortening = ½ the diagonal thickness of ridge.

• Draw a square line on the top with a center mark.

Usually 1 1/16″

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Hip Layout for Ridge

• Side cuts are added for fit.

Usually

3/4″

• Side cut = ½ the thickness of hip.

• Draw angled line over the top.

• Red lines are the cut lines.

Usually 1 1/16″

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Hip Rafter Length

• Unit Length x Run = Rafter Length

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Hip Rafter Length

• If the building span is 24′, then the run is _____.12

18″

12 units of run x 18″ = 216″

• If the unit rise is 6″, the hip unit length is ______.

• The hip rafter line length is …

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Hip Rafter Length

• Rafter Length = 216″

• Measured from first ridge plumb line.

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Bird’s Mouth Layout

• Draw heel plumb line.

• Measure down equal to common rafter bird’s mouth height.

• Draw seat cut line.

216″

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Bird’s Mouth Layout

• Measure back along seat line ½ hip thickness.

Usually 3/4″

• Measure down plumb to the bottom edge of rafter.

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Bird’s Mouth Layout

• Measure back along seat line ½ hip thickness.

Usually 3/4″

Same

• Measure down plumb to the bottom edge of rafter.

• Raise seat line this distance.

• Red lines are cut lines.

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Hip Tail Layout

• Either measure the run

• Or measure the length

• Measure down the plumb line same as the common rafter

• Determine the location of hip fascia plumb line

• Square over the top with a center mark

• Draw level line

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Hip Tail Layout

Usually 3/4″

• Raise level line same as bird’s mouth seat line.

• Measure back from plumb line ½ hip thickness.

• Draw angled lines on top.

• Red lines are cut lines.

Usually 3/4″

Same

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Conclusion

• Hip layout lines are added one at a time.