C
onstruCtion
M
aster
P
lus
eZ
5
rafTer funCTion
Basic rafters
required entries
Possible Solutions
Two of these required:
• Pitch
• Run (or Span)
• Rise
• Common Rafter Length
Common Rafter Length
Level Angle
Pitch
Plumb Angle
Run
Rise
Solve for Basic Rafters using an 8" Pitch and 12' Run:
1. Clear Calculator:
OOO
2. Start Rafter function:
r
3. Enter 8" Pitch:
8ie
4. Enter 12′ Run and solve for Basic Rafters:
12fe
diaGonaL
14 Feet 5-1/16 inCh
e
PLUMB anGLe
33.69 °
e
LeVeL anGLe
56.31 °
e
riSe
8 Feet 0 inCh
advanced rafters
required entries
Possible Solutions
Two of these required:
• Pitch
• Run (or Span)
• Rise
• Common Rafter Length
Common Rafter Length
Common Tail Length**
Total Rafter Length**
Plumb Angle
Level Angle
Seat Cut
Standard 2/3 HAP
Full Bearing HAP
Pitch
Run
Rise
optional entries
Horizontal Overhang
Total Fascia Thickness
Ridge Thickness
• Default value: 1-1/2"
Rafter Width
• Default value: 7-1/4"
Top Plate Width
• Default value: 3-1/2"
HAP*
* Height Above Plate. If a Top Plate value is shown when you want to enter a HAP, clear
the Top Plate value by pressing either
O
or
0
. Then, press
e
to move to the
HAP entry prompt and enter the desired value.
**Tail Length and Total Rafter Length shown only when Horizontal Overhang is entered.
Enter an 8" Pitch, a 12′ Run, an 18" Overhang and 2-1/4" Total
Fascia Thickness:
1. Clear Calculator:
Cx
2. Start Advanced Rafter function:
Cr
3. Enter 8" Pitch:
8ie
4. Enter 12′ Run:
12fe
5. Enter 18" Overhang:
18ie
6. Enter 2-1/4" Total Fascia Thickness:
2i1 / 4e
7. Accept 1-1/2" default value for Ridge Thickness:
e
8. Accept 7-1/4" default value for Rafter Width:
e
9. Accept 3-1/2" default value for Top Plate Width and solve for Rafters:
e
CoMMon raFter Lnth
14 Feet 4-3/16 inCh
e
taiL LenGth
19-3/8 inCh
e
totaL raFter Lnth
15 Feet 11- 9/16 inCh
e
PLUMB anGLe
33.69°
e
LeVeL anGLe
56.31°
e
Standard 2/3 haP
5- 13/16 inCh
e
FULL BearinG haP
6-3/8 inCh
e
riSe
8 Feet 0 inCh
hip/Valley rafTer funCTion
Basic hip/Valley rafters
required entries
Possible Solutions
Two of the first three required:
• Common Pitch
• Run (or Span)
• Rise
Hip/Valley Length
Plumb Angle
Level Angle
Common Cheek Angle
Irregular Cheek Angle
optional entries
Irregular Pitch
Find the Hip/Valley Rafter Lengths and Angles using an 8" Common Pitch and
a 12′ Run:
1. Clear Calculator:
OOO
2. Start Basic Hip/Valley function:
h
3. Enter 8" Common Pitch:
8ie
4. Enter 12′ Run:
12fe
5. No entry for Irregular Pitch (Common Pitch used). Solve for
Hip/Valley values:
e
hiP/VaLLeY Lnth
18 Feet 9-1/8 inCh
e
PLUMB anGLe
25.24°
e
LeVeL anGLe
64.76°
e
CoMMon CheeK anGL
45.00°
Find the Hip/Valley Rafter Lengths and Angles using an 8" Common Pitch, an 8′
Run and an Irregular Pitch of 10":
1. Clear Calculator:
OOO
2. Start Basic Hip/Valley function:
h
3. Enter 8" Common Pitch:
8ie
4. Enter 8′ Run:
8fe
5. Enter 10" Irregular Pitch and solve for Hip/Valley values:
10ie
hiP/VaLLeY Lnth
11 Feet 6-5/8 inCh
e
PLUMB anGLe
27.50°
e
LeVeL anGLe
62.50°