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SER
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UIDE
— 17
HIP/VALLEY and JACK RAFTER KEYS
Your calculator uses the
y
(rise),
x
(run),
r
(diagonal), θ (pitch), and
o.c. spacing values to calculate Regular (45°) and Irregular (non-45°)
Hip/Valley and Jack rafter lengths (excluding wood thickness, etc.).
When calculating Regular and Irregular Jack rafter lengths, you will
see the letters “JK” (Common Pitch side) or “IJ” (Irregular Pitch side)
and the corresponding Jack number to the left of your calculator dis-
play. This will help you keep track of the descending sizes and which
side the corresponding rafter is based on.
H
Hip/Valley Rafter
— Finds the Regular (45°) or
Irregular (non-45°) Hip/Valley rafter length.
•
Regular Hip/Valley Length:
After Right
Triangle/Rafter values are entered or calculated
(e.g., Pitch, Rise, Run), pressing
H
will calculate
the length of the Regular Hip/Valley rafter.
•
Irregular Hip/Valley Length:
If an Irregular Pitch is
entered via
Ç H
(see next page), pressing
H
will calculate the Irregular Hip/Valley rafter
length. (An Irregular or “non-standard” roof has two
different Pitches/Slopes.)
(Cont’d)
