Irregular Jack Rafter Function [IrJack]   Enhanced Irregular Jack Rafter Function

The Enhanced Irregular Jack Rafter Layout Function provides the following layout information for hip roofs beyond the information provided by the [Hip/V] (Hip / Valley Rafters) Function - with the minimum amount of hassle for you.
Information required for this function includes:




Also, if an Irregular Pitch is stored, then subsequent presses of the [IrJack] key will switch between Irregular and Regular Jack Rafter results.  If no Irregular Pitch is stored, the IrJack key will function the same as the [Jack] key
In addition to [IrPitch], calculations for Irregular Jack Rafters are based upon if the [Prefs] Irregular Jack Spacing is set to either On-Centers or Mating.  The next two illustrations help explain the difference.


Irregular Hip/Valley layout with Rafters mating at the hip/valley.


Irregular Hip/Valley layout with rafters spaced at the on-center distance.


Part A. Common Rafter Length and cut angles.
Input
[clr] [clr]
12 [Feet] [Run]
7 [Inch] 1 [ / ] 2 [Pitch]
[ Diag ]   
[ Diag ]   
Display
0
Run
    12ft
Pitch
    7- 1/2in/12in
Diagonal
    14ft 1- 13/16in
  see results, below




Part B: Hip/Valley rafter length and cut angles for an Irregular hip roof - the Minor Pitch is 9"/12".
Input
9 [Inches] [Hip/V]
Display
see results, below



Part C: Jack Rafter Layout.
Input
[Conv] [IrJack]   
Display
  see results, below


Scroll down to see all of the results.  Where are the regular jack rafter layout dimensions?  Tap [Done] and then tap [Jack] to see them.  Repeated taps of [Jack] switch between Irregular and Regular Jack Rafter Layout display.

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