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)
angle in plan on the Major side.
The Plan angles are also the cheek cut bevels
for both the Jacks and the Hip.
The minor side jacks are always cut with the
major plan angle bevel and reversed for the major side jacks
The opposite happens to 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) |
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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 | |
Hip Heel Cut Angle
Heelcut = 90 - HipAngle | |
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 | |
Hip Drop Major Side
HipDrop = tan(BackingAngle)* 1/2 hip thickness |
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Hip Drop Minor Side | |
Common Rafter LL Major Side
majLL = (majspan * majLLratio)
majLLratio=sqrt((major*major)+144)/12 |
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Common Rafter 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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Jack 1 Major Side
jack1 =majLL - Majordiff - majhalfhipatangle |
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Jack 1 Minor Side
majhalfhipatangle =sqrt(2 *(halfhipthickness * halfhipthickness)) * majLLratio | |
Jack 2 Major Side
jack1 - Majordiff |
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Jack 2 Minor Side | |
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Jack 3 Major Side |
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Jack 3 Minor Side | |
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Jack 4 Major Side |
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Jack 4 Minor Side | |
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Jack 5 Major Side |
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Jack 5 Minor Side | |
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Jack 6 Major Side |
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Jack 6 Minor Side | |
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Jack 7 Major Side |
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Jack 7 Minor Side | |
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Jack 8 Major Side |
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Jack 8 Minor Side | |
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Jack 9 Major Side |
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Jack 9 Minor Side | |
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Jack 10 Major Side |
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Jack 10 Minor Side | |
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Jack 11 Major Side |
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Jack 11 Minor Side | |
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Jack 12 Major Side |
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Jack 12 Minor Side | |