- 30 -
EXAMPLE PROBLEMS
Then multiply:
5
3
5
Answer:
3015.929 CU INCH
Convert to feet
by pressing:
Feet
Answer:
1.745329 CU Ft
Concrete Weight/Volume
Determine the weight and volume for this concrete patio.
Use default 1.5Tn/Cu Yd and depth of 6"
First check weight/volume default by pressing
[2ND] [5]
.
If not 1.5 Tn/Cu Yd see
Default Section
Enter:
Feet
Inch
8
5
6
1
3
3
5
3
3
Feet
Inch
3
Inch
Answer:
225.8472 CU Ft
Convert to Cubic yards: Press
Yard
Answer:
8.364712 CU Yd
To determine weight: Press
8
2ND
Answer:
12.54707 Tn
33' 8"
13' 5"
- 31 -
Roof Rise
Given any two - pitch, rise, run or diagonal will automatically
solve for the other two. Here is a useful calculation in determin-
ing wall heights. This example will figure the RISE of a roof
knowing the PITCH is 4 in 12 and the RUN is 13' - 2 3/8"
Remember: The PITCH of a roof equals its RISE in INCHES
over a RUN of 12" thus a 4/12 roof has a SLOPE of 4".
(when entering SLOPE always use inches) In Metric pitch
is expressed in millimeters over 1,000 millimeters of run.
Enter
Display
Pitch
Inch
4
PTCH 4 INCH
Run
Feet
Inch
/ 8
1
2
3
3
RUN 13 Ft - 2 3/8 INCH
Rise
RISE 4 Ft - 4 51/64 INCH
Diag
DIAG 13 Ft - 10 15/16 INCH
Pitch
PTCH 4 INCH
Pitch
PTCH 0.333333 (In Ratio)
Pitch
PTCH 18.43495°
EXAMPLE PROBLEMS
rise
Run = 13 2 3/8
Rise = ??
4
Pitch
12
run
- 32 -
EXAMPLE PROBLEMS
Roof Pitch Given Rise & Run
Enter
Display
Rise
Feet
Inch
8
6
RISE 6 Ft- 8 INCH
Run
Feet
2
0
RUN 20 Ft- 0 INCH
Pitch Pitch
PTCH 4 INCH
Remember: Pitch is always rise in inches over a run of 12
inches.
Regular Hip/Valley & Jack Rafter
When two roofs are perpendicular (90°) to each other and
have the same pitch, they meet at a 45° angle. This is known
as a regular condition.
Given a run of 12' and a rise of 6' calculate common rafters,
hip/valley rafters, hip jack/valley jack rafters. Standard on-
center spacing is assumed.
Operation:
Rise
Key Sequence:
Rise
Feet
6
Display:
RISE 6 Ft- 0 INCH
rise
Run = 20 0
Rise = 6 8
Pitch
=
?? 12
run
