Irregular Jack Rafter Function [IrJack]   Irregular Jack Rafter Function

The 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:
Information required for this function includes:






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


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

Rafter layout.

Example of a
Irregular Hip/Valley and Jack Rafter calculation:  (see [Jack] for  Regular Hip/Valley examples.

Part A: Setup [Prefs] for Ascending Jack
            Order and Mating Jack Spacing
Note: don’t forget to undo these changes!
Input
[clr] [clr]
[Conv] [Prefs]
[ Prefs ]
[ Prefs ]
[ Prefs ]
[ Prefs ]
[ Prefs ]

[ ▼ ]   
[ Prefs ]   
[ ▼ ]   
[clr] [clr]  
Display
Fractional Resolution
    0- 1/16in
Fractional Resolution
    0- 1/16in
Volume Display
    Standard
Staircase Headroom
    6ft 8in
Rake Wall Display
    Largest to Smallest
Arched Wall
    Outside
Jack Rafters
    Largest to Smallest
Jack Rafters
    Smallest to Largest
Irregular Jack Spacing
    On-Centers
Irregular Jack Spacing
    Mate at hip/valley
0

Part B. Common Rafter Layout.
Input
[clr] [clr]
40 [Inch] [Run]
7 [Inch] 1 [ / ] 2 [Pitch]
[ Diag ]   
[ Diag ]   
[ Diag ]   
Display
0
Run
    40in
Pitch
    7- 1/2in
Diagonal
    47- 3/16in
Plumb
    32.01°
Level
    57.99°

Part C: Enter Irregular Pitch and calculate the Irregular Hip/Valley rafter length and cut angles.
Input
9 [Inch]
[Conv] [IrPitch]
[ Hip/V ]
[ Hip/V ]
[ Hip/V ]
[ Hip/V ]
[ Hip/V ]
[ Hip/V ]
Display
Irregular (Minor) Pitch
    9in
Irregular Hip/Valley Rafter Length
    57- 3/4in
Plumb Cut
    25.65°
Level Cut
    64.35°
Cheek Cut 1
    39.81°
Cheek Cut 2
    50.19°
Irregular Pitch
    9in


Part C: Display the Irregular Jack Rafter Layout*.
Input
[Conv] [IrJack]
[ Jack ]   
[ Jack ]   
[ Jack ]   
[ Jack ]   
[ Jack ]   
[ Jack ]   
Display
Irregular Jack Rafter On-Center Spacing
    16in
Irregular Jack Rafter Length Increment
    16- 11/16in
Irregular Jack Rafter 1 Length
    16- 11/16in
Irregular Jack Rafter 2 Length
    33- 5/16in
Irregular Jack Rafter Plumb Cut
    36.87°
Irregular Jack Rafter Level Cut
    53.13°
Irregular Jack Rafter Cheek Cut
    39.81°

Part D: Display the Regular Jack Rafter Layout*.
Input
[Jack]
[ Jack ]   
[ Jack ]   
[ Jack ]   
[ Jack ]   
[ Jack ]   
[ Jack ]   
Display
Jack Rafter On-Center Spacing
    16in
Jack Rafter Length Increment
    16- 11/16in
Jack Rafter 1 Length
    16- 11/16in
Jack Rafter 2 Length
    33- 5/16in
Jack Rafter Plumb Cut
    36.87°
Jack Rafter Level Cut
    53.13°
Jack Rafter Cheek Cut
    39.81°


Part E: Reset [Prefs] back to Descending Jack Order and On-Center Jack Spacing.
Input
[clr] [clr]
[Conv] [Prefs]
[ Prefs ]
[ Prefs ]
[ Prefs ]
[ Prefs ]
[ Prefs ]

[ ▼ ]   
[ Prefs ]   
[ ▼ ]   
[clr] [clr]  
Display
Fractional Resolution
    0- 1/16in
Fractional Resolution
    0- 1/16in
Volume Display
    Standard
Staircase Headroom
    6ft 8in
Rake Wall Display
    Largest to Smallest
Arched Wall
    Outside
Jack Rafters
    Smallest to Largest
Jack Rafters
     Largest to Smallest
Irregular Jack Spacing
    Mate at hip/valley
Irregular Jack Spacing
    On-Centers
0


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