Major Side Roof Pitch
Major |
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Minor Side Roof Pitch
Minor |
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Major Side Roof Span
(building width-ridge thickness)/2 |
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Hip Thickness |
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On Center Spacing |
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Major Side Plan Angle
atan(minor/major)
The Plan angles are also the cheek cut bevels
for both the Jacks and the Hip.
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Minor Side Plan Angle
atan(major/minor) |
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Major Side Pitch Angle
atan(rise/12)
pitch angle of the Major side. | |
Minor Side Pitch Angle
atan(rise/12)
pitch
angle of the Minor roof. |
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Major Side Difference
Majordiff = (tan(majplanangle)/cos(majpitchangle))* OCspace
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Minor Side Difference(Step)
Amount each jack is shortened to land at the next on
center layout along the hip |
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Major Side Ply Angle
majplyangl= atan(tan(majplanangle) /cos(majpitchangle))
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Minor Side Ply Angle | |
Plywood Sheathing Cut Major Side
majPlySheathCut = 48 / tan(minplyangle) |
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Plywood Sheathing Cut Minor Side
Amount to measure back from top corner of sheet to chalk
cut line. This creates the Ply Angle from above | |
Hip Seat Cut Angle
Seatcut = 90 - HipAngle |
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Angle of Hip
HipAngle = atan(cos(majplanangle)* tan(minpitchangle))
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Backing Angle Major Side
majBackAngle = atan(sin(HipAngle) / tan(minplanangle))
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Backing Angle Minor Side
Bevel to rip along edge of hip to have it plane with the sheathing | |
Hip Drop Major Side
HipDrop = tan(BackingAngle)* 1/2 hip thickness |
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Hip Drop Minor Side
If the hip is not backed this is the amount to lower
the seatcut of the hip to have the corner edge of the hip plane in with the sheathing | |
Common Rafter LL Major Side
majLL = (majspan * majLLratio)
majLLratio=sqrt((major*major)+144)/12 |
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Common Rafter LL Minor Side
minLL = rise / sin(minpitchangle) | |
Hip Line Length
hiplength = rise /sin(HipAngle) |
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Minor Roof Span
minspan = minLL * (sqrt(1-(rise*rise)/(minLL * minLL)))
This is the distance from the end
of the ridge to the building line |
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