Calculated Industries 4065 Construction Master Pro v3.0 User manual

C ONSTRUCTION M ASTER
®
P RO
User s Guide
For Models:
4065 v3.1 Construction Master Pro
4080 v3.1 Construction Master Pro Trig
44080 v3.1 Construction Master Pro Desktop

This User’s Guide helps you solve common construction math and
material estimation problems using the latest Construction Master Pro
calculators—three of the most powerful feet-inch-fraction calculators
to date:
The Construction Master Pro III Series —
1. Construction Master Pro (#4065 v3.1)
2. Construction Master Pro Trig (#4080 v3.1)
3. Construction Master Pro Desktop (#44080 v3.1)
IMPORTANT: The Construction Master Pro Trig does not have
Block, Concrete Footing, Drywall, or Length, Width, and Height
functions. These keys are replaced with standard trigonometric keys.
C ONSTRUCTION M ASTER
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V 3.1
U SER ’ S G UIDE

The Construction Master Pro line includes the most advanced feet-
inch-fraction calculators designed specifically for building pro’s!
The Pro calculators handle practically any problem involving meas-
urements and can be used to save time, prevent errors, and accu-
rately perform common building projects such as: estimating con-
crete volume, squaring-up foundations, framing roofs, ordering lum-
ber, building stairs, walls, laying driveways, carpet or floor covering,
figuring precise angle calculations, or simply working in feet-inch-
fractions or decimal feet!
Your Calculator Helps You Solve:
• Dimensional Math Problems
• Conversions Between Feet-Inch-Fractions, Decimal Feet,
Decimal Inches, and Yards
• Imperial/Metric Conversions
• Problems Involving All Common Fractions — 1/2” to 1/64”!
• Area/Volume Calculations
• Board Feet/Lumber Calculations
• Circle Calculations
• Column/Cone Area and Volume
• Compound Miter Cuts for Crown Moulding
• Material Estimations and Costs
• Polygons
• Rake-Walls
• Right Angle/Triangle Solutions
• Roofing Materials
• Stair Layout (Risers/Treads)
• Studs
• Weight/Volume Conversions
Pro and Desktop Models ( NOT AVAILABLE ON TRIG MODEL #4080)
Also Solve:
• Block/Bricks, Concrete Footings and Drywall
• Instant Square-up, Perimeter, Wall Area, Room Area and
Volume
INTRODUCTION

GETTING STARTED..........................................................................1
KEY DEFINITIONS .........................................................................1
Basic Operation Keys ..................................................................1
Convert ÇKey – Unit Conversions and Second Functions ....1
Memory and Storage Functions...................................................2
Recall ®Key.............................................................................3
Dimensional Measurement Unit Keys..........................................3
Area and Volume Keys (NOT AVAILABLE ON TRIG MODEL #4080)......4
Weight Keys.................................................................................5
Construction Project Keys and Functions....................................6
Block/Brick Function (NOT AVAILABLE ON TRIG MODEL #4080)..........6
Circular/Arc Function Keys ..........................................................7
Column/Cone Function................................................................8
Compound Miter/Crown Moulding Keys......................................8
Drywall Function (NOT AVAILABLE ON TRIG MODEL #4080)................9
Footing Function (NOT AVAILABLE ON TRIG MODEL #4080)................9
Polygon Function.........................................................................9
Right Triangle/Roof Framing Keys.............................................10
Hip/Valley and Jack Rafter Keys................................................11
Rake-Wall Function....................................................................13
Roof Materials/Covering Function..............................................14
Stair Key ....................................................................................14
Studs Function...........................................................................16
Trigonometric Keys (TRIG #4080 AND DESKTOP #44080
MODELS ONLY)...........................................................................16
ENTERING DIMENSIONS............................................................18
Entering Linear Dimensions.......................................................18
Entering Square/Cubic Dimensions...........................................18
SETTING FRACTIONAL RESOLUTION.......................................20
Setting Fraction Resolution – Using the Preference
Setting Mode ...........................................................................20
Converting a Fractional Value to a Different Resolution............21
CONVERSIONS (LINEAR, AREA, VOLUME) ..............................22
Linear Conversions....................................................................22
Converting Feet-Inch-Fractions to Decimal Feet.......................22
Converting Decimal Feet to Feet-Inch-Fractions.......................22
Converting Fractional Inches to Decimal Inches.......................23
Converting Decimal Inches to Fractional Inches.......................23
Square Conversions ..................................................................23
TABLE OF CONTENTS

Cubic Conversions.....................................................................23
PERFORMING BASIC MATH WITH DIMENSIONS.....................24
Adding Dimensions....................................................................24
Subtracting Dimensions.............................................................24
Multiplying Dimensions..............................................................24
Dividing Dimensions ..................................................................24
Percentage Calculations............................................................25
MEMORY OPERATION ................................................................25
Basic Cumulative Memory (M+).................................................26
Permanent Storage Registers (M1 and M2)..............................26
PAPERLESS TAPE OPERATION.................................................27
EXAMPLES – USING THE CONSTRUCTION MASTER PRO ......29
LINEAR MEASUREMENT EXAMPLES........................................29
Adding Linear Measurements....................................................29
Cutting Boards...........................................................................29
Window Measurement...............................................................30
Calculating the Center Point......................................................30
AREA CALCULATIONS ................................................................31
Square Area (x2) ........................................................................31
Area of a Rectangular Room (LxW) ..........................................31
Using Multi-Function WKey to Find Area, Square-up and
Perimeter (NOT AVAILABLE ON TRIG MODEL #4080)......................31
VOLUME CALCULATIONS...........................................................32
Rectangular Containers (LxWxH)..............................................32
Using the Multi-Function hKey to Find Volume,
Wall Area and Room Area
(NOT AVAILABLE ON TRIG MODEL #4080) ......................................32
Volume of a Cylinder..................................................................33
Volume of a Cone ......................................................................33
WEIGHT/VOLUME CONVERSIONS............................................34
Weight Conversions...................................................................34
Weight per Volume/Volume Conversions...................................34
BLOCKS/BRICKS (NOT AVAILABLE ON TRIG MODEL #4080)...............35
Number of Blocks, Based on Entered Length and Height ........35
Number of Blocks, Based on Entered Area...............................35
Number of Blocks, Based on Calculated Perimeter ..................36
Number of Blocks, Based on Entered Length ...........................36
Number of “Face” Bricks ...........................................................37
Number of “Paver” Bricks .........................................................37
BOARD FEET – LUMBER ESTIMATION .....................................38
Total Board Feet – With Dollar Cost ..........................................38

Number of Board Feet Based on Entered Volume....................38
CIRCLE AND ARC CALCULATIONS............................................39
Circumference and Area of a Circle...........................................39
Arc Length – Degree and Diameter Known ...............................39
Arc Length – Chord Length and Segment Rise Known .............39
Arc Calculations – Arc Length and Diameter Known ................40
ARCHED SEGMENT WALLS.......................................................41
Arched Segment Walls – Arched Windows (No Base) ..............41
Arched Segment Walls – Arched Windows (With Base) ...........42
Arched Segment Walls – Chord Length and Segment Height
Known .....................................................................................43
COMPOUND MITER.....................................................................45
Compound Miter Cuts................................................................45
CONCRETE/PAVING....................................................................46
Volume of Concrete for a Driveway...........................................46
Concrete Columns.....................................................................47
Complex Concrete Volume........................................................48
Polygon, Finding Angles Based on Entered Radius and
Number of Sides.....................................................................49
Concrete Footings (NOT AVAILABLE ON TRIG MODEL #4080)...........50
Squaring-up a Foundation .........................................................51
DRYWALL (NOT AVAILABLE ON TRIG MODEL #4080)...........................52
Number of Drywall Sheets for a Given Area..............................52
Number of Drywall Sheets for a Given Length..........................52
GRADE/SLOPE.............................................................................53
Back-Fill on a Slope – Percent of Grade Known .......................53
RIGHT TRIANGLE AND ROOF FRAMING EXAMPLES..............54
Roof Framing Definitions ...........................................................55
Degree of Pitch..........................................................................57
Percent Grade............................................................................57
Pitch Ratio or Slope...................................................................57
Common Rafter Length..............................................................58
Common Rafter Length – Pitch Unknown .................................58
Angle and Diagonal (Hypotenuse).............................................59
Rise............................................................................................59
Rise and Diagonal......................................................................59
Sheathing Cut............................................................................60
Regular Hip/Valley and Jack Rafters ........................................60
Jack Rafters – Using Other Than 16-Inch On-Center
Spacing ..................................................................................61

Irregular Hip/Valley and Jack Rafters – Descending, with
On-center Spacing Maintained ...............................................62
Irregular Hip/Valley and Jack Rafters – Ascending, with
Jacks Mating at Hip/Valley ......................................................64
Rake-Wall – No Base .................................................................66
Rake-Wall – With Base ..............................................................67
ROOFING MATERIALS ................................................................68
Roof Covering – Entering Pitch, Length and Width ..................68
Roof Covering – Entering Rise, Run (No Pitch) and Area .........69
STAIR LAYOUT EXAMPLES ........................................................70
Stair Layout Definitions..............................................................70
Stairs – Given Only Floor-to-Floor Rise .....................................72
Stairs – Given Only the Run ......................................................74
Stairs – Given Rise and Run .....................................................75
Stairs – Given Rise and Run, Using “Riser Limited” Function
for Code Restrictions ..............................................................76
Baluster Spacing........................................................................77
STUDS..........................................................................................78
BASIC D:M:S AND TRIGONOMETRY EXAMPLES.....................78
Converting Degrees:Minutes:Seconds ......................................78
Time Calculations Using D:M:S.................................................78
TRIGONOMETRIC FUNCTIONS..................................................79
Converting Percent Grade to D:M:S..........................................80
Converting Tangent/Pitch to Angle.............................................80
Converting Roof Angle in Degrees to Pitch in Inches................80
Angle – Rise and Hypotenuse Known .......................................81
APPENDIX A – DEFAULT SETTINGS ............................................82
APPENDIX B – PREFERENCE SETTINGS ....................................83
How to Set Preferences.............................................................86
Accessing Preference Settings..................................................86
APPENDIX C – CARE INSTRUCTIONS .........................................89
APPENDIX D – IMPORTANT NOTES FOR OWNERS OF
PREVIOUS CONSTRUCTION MASTERS ..................................90
APPENDIX E – ACCURACY/ERRORS, AUTO SHUT-OFF,
BATTERIES, RESET ....................................................................91
ACCURACY/ERRORS..................................................................91
Error Codes................................................................................91
AUTO SHUT-OFF .........................................................................91
BATTERIES...................................................................................92
Replacing the Battery(ies)..........................................................92
Battery Replacement Instructions..............................................92

RESET ..........................................................................................92
APPENDIX F – AREA/VOLUME FORMULAS ................................93
AREA FORMULAS........................................................................93
SURFACE AREA/VOLUME FORMULAS .....................................94
REPAIR AND RETURN ...................................................................95
WARRANTY.....................................................................................96
INDEX...............................................................................................99

U SER ’ S G UIDE — 1
KEY DEFINITIONS
Basic Operation Keys
o On/Clear — Turns power on. Pressing once clears
the display. Pressing twice clears all temporary values.
O Off — Turns all power off, clearing all non-permanent
registers. For desktop model 44080, press Ç o
to turn power off.
+ – x Arithmetic operation keys.
÷ =
%Four-function (+, -, x, ÷) percent key. (See page 25
for examples.)
0– 9and •Keys used for entering digits.
)(DESKTOP ONLY)Enters “00” to save keystrokes (e.g.,
1 ) to enter 100).
B Backspace Key — Used to delete entries one key-
stroke at a time (unlike the ofunction, which
deletes the entire entry).
Convert ÇKey — Unit Conversions and Second Functions
The Çkey is used to convert between measurement units or to
access the second functions listed below:
Ç x Clear All — Clears all values, including Memory.
Resets all permanent entries to default values
(except Preference Settings which are retained).
Note: Use only when necessary, as it resets all stored values to
factory defaults. See page 82 for a listing of default values.
Ç % x2 — Squares the value in the display. For example,
to square the value 10, enter 1 0 then Ç %.
Ç B Square Root Function ( ) — Used to find the
square root of a non-dimensional or area value
(e.g., 1 0 0 Ç B = 10).
Ç / x10y — Allows entry of an exponent. For example,
8 Ç / 1 4 is 8 times 10 to the 14th power.
Ç ÷ 1/x — Finds the reciprocal of a number (e.g., 8
Ç ÷ = 0.125).
GETTING STARTED

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Ç – Change Sign (+/–) — Toggles the sign of the dis-
played value to positive or negative.
Ç + Pi ( π ) — Constant = 3.141593
Ç • Degrees:Minutes:Seconds (dms deg) —
Converts between D:M:S and decimal degree formats.
Ç 0 Total Cost (Cost) — Calculates total material cost
given a unit dimension and an entered Per Unit Cost.
Ç ß Access Preference Settings (Prefs) — Used to
access various customizable settings, such as
dimensional answer formats (see Preference
Settings on page 83).
Memory and Storage Functions
µ Cumulative Memory — Whenever the µkey is
pressed, the displayed value will be added to the
Memory. Other memory functions:
FUNCTION KEYSTROKES
Add to Memory µ
Subtract from Memory Ç µ
Recall total in Memory ® µ
Display/Clear Memory ® ®
Clear Memory Ç ®
Memory is semi-permanent, clearing only when you:
1) turn off the calculator;
2) press ® ®;
3) press Ç ®;
4) press Ç x (Clear All) .
When memory is recalled (® µ), consecutive
presses of µ will display the calculated average
and total count of the accumulated values.
ß 1 – 3 Storage Registers (M1) through (M3) — Stores
the displayed value in non-cumulative, permanent
Memory (e.g., 1 0 ß 1). Good for storing a
single value, for future reference (® 1 = 10).
Note: Non-cumulative means it only accepts one value (does not
add or subtract) and a second entered value will replace the first.
Permanent means the value is stored even after the calculator is
shut off. To delete a stored value, enter a new value or perform a
Clear All (Ç x) .

U SER ’ S G UIDE — 3
Recall ®Key
The ®key is used to recall or review stored values (e.g., ® p
to recall a previously entered pitch value). It is also used in reviewing
stored settings, or in Paperless Tape and Memory operation (see
below).
® = Paperless Tape (Tape) — Accesses the paperless
tape mode (see “Paperless Tape” page 27), which
keeps track of your past 20 entries. Useful for
checking strings of numbers.
® ® Clear M+ — Displays and clears M+.
® µ Recall M+ — Displays value stored in M+.
® 1 – 3 Recall (M1) through (M3) — Recalls the value
stored in M1, M2, or M3.
Dimensional Measurement Unit Keys
The following keys are used for entering units of measure, with ease
and accuracy:
y Yards — Enters or converts to Yards .
f Feet — Enters or converts to Feet . Also used with
the iand /keys for entering Feet-Inch values
(e.g., 6 f 9 i 1 / 2).
Note: Repeated presses of f after Ç toggle between Feet-
Inches and Decimal Feet (e.g., 6 f 9 i 1 / 2 Ç f =
6.791667 Feet; press f again to return to Feet-Inch-Fractions).
i Inches — Enters or converts to Inches . Also used
with the /key for entering fractional Inch values
(e.g., 9 i 1 / 2).
Note: Repeated presses of i after Ç toggle between
Fractional and Decimal Inches (e.g., 9 i 1 / 2 Ç i =
9.5 Inch; press i again to return to Fractional Inches).
/ Fraction Bar — Used to enter fractions . Fractions
may be entered as proper (1/2, 1/8, 1/16) or improper
(3/2, 9/8). If the denominator (bottom) is not entered,
the calculator's fractional resolution setting is auto-
matically used (e.g., entering 1 5 / = or +will
display 15/16, based on the default fractional resolu-
tion setting of 16ths.

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m Meters — Enters or converts to Meters .
Ç 7 Centimeters (cm) — Enters or converts to
Centimeters .
Ç 9 Millimeters (mm) — Enters or converts to
Millimeters .
Ç 2 Acres (Acre) — Enters or converts (a square value)
to Acres .
Ç 8 Board Feet (Bd Ft) — Enters or converts cubic
values to Board Feet . One Board Foot is equal to
144 Cubic Inches.
Area and Volume Keys (NOT AVAILABLE ON TRIG MODEL #4080)
l Length — Enters a length for calculation of area or
volume.
W Width — A multi-function key used to enter a width
for calculation of area or volume (if a length and
height are also entered). Consecutive presses of
this key display or calculate:
Press Result
1 Displays Entered Width (WDTH)
2 Area (AREA)
3 Square-up (SQUP)
4 Perimeter (PER)
5 Redisplays Entered Length (LNTH)
6 Redisplays Entered Width (WDTH)
h Height — A multi-function key used to enter a
height for calculation of volume (if a length and width
are also entered). Consecutive presses of this key
display or calculate:
Press Result
1 Displays Entered Height (HGHT)
2 Volume (VOL)
3 Wall Area (WALL)
4 Total Room Area (ROOM)
5 Redisplays Entered Length (LNTH)
6 Redisplays Entered Width (WDTH)

U SER ’ S G UIDE — 5
Weight Keys
Ç 1 Kilograms (kg) — Enters or converts (a weight or vol-
ume value) to Kilograms . A dimensioned volume will
convert using the stored Weight per Volume value.
Ç 3 Metric Tons (met tons) — Enters or converts (a
weight or volume value) to Metric Tons . A dimen-
sioned volume will convert using the stored Weight
per Volume value.
Ç 4 Pounds (lbs) — Enters or converts (a weight or vol-
ume value) to Pounds . A dimensioned volume will
convert using the stored Weight per Volume value.
Ç 6 Tons (tons) — Enters or converts (a weight or vol-
ume value) to Tons . A dimensioned volume will con-
vert using the stored Weight per Volume value.
ß 0 Store Weight per Volume (wt/vol) — Stores a new
Weight per Volume value as Tons per Cubic Yard or
other format, as listed below:
Note: After entering a value and pressing ß 0 , continue
pressing the 0 digit key until you’ve reached the desired weight
per volume format. To recall your setting, press ® 0 .
• Ton Per CU YD
• LB Per CU YD
• LB Per CU FEET
• MET Ton Per CU M
• kG Per CU M
This value is permanently stored until you change it
or perform a Clear All (Ç x).

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Construction Project Keys and Functions
The following Construction Project Keys and Functions help you instantly
figure quantities and costs of materials, so you can build like a pro!
Block/Brick Function (NOT AVAILABLE ON TRIG MODEL #4080)
The Blocks function helps you quickly estimate the quantity of blocks
or bricks required for building walls, walkways or other areas.
Ç l Number of Blocks or Bricks (Blocks) —
Calculates the number of blocks (or bricks) based on:
• an entered or calculated linear value
• an entered or calculated area
• an entered value in l
• values entered in l and h (solved area)
Uses a standard block/mortar area of 128 Square
Inches and a block length of 16 Inches. This
function can also be used for calculating the number
of “face” or “paver” bricks by storing a brick size
(see below).
ß 4 Store Block or Brick Size (Blk Size) — Used to
store: (1) a block area other than the default block
area of 128 Square Inches (e.g., 1 2 0 i i
ß 4 stores an area of 120 Square Inches) and
(2) a block length other than the default block length
of 16 Inches (e.g., 1 8 i ß 4 stores a length
of 18 inches). These values are permanently stored
until you change them or perform a Clear All (Ç
x). To recall the stored settings, press ® 4
(repeated presses of ® 4 toggle between block
area and block length).
Note: For Brick Estimates — You may also enter a brick size
using ß 4 . For example, when building with standard “face”
bricks, enter a brick size of 21 Square Inches ( 2 1 i i
ß 4 ) or store a “paver” brick size of 32 Square Inches ( 3 2
i i ß 4 ; based on Modular U.S. brick size of
3-5/8 Inches x 2-1/4 Inches x 7-5/8 Inches, including 3/8-inch
mortar = 4 Inches x 2-5/8 Inches x 8 Inches).

U SER ’ S G UIDE — 7
Circular/Arc Function Keys
The circle key helps you quickly solve circular area, volume or arc
problems.
C Circle — Displays and calculates the following val-
ues, given an entered circle diameter* or radius:
• Diameter (DIA)
• Circle area (AREA)
• Circumference (CIRC)
*To enter a diameter (e.g., 10 Feet), press 1 0 f C .
Ç a Radius — Enters or calculates the circle radius
(e.g., 5 f Ç a).
a Arc Length or Degree of Arc — A multi-function
key that enters or calculates Arc Length or Degree
of Arc , and further solves for additional circular/arc
values, including arched segment walls (based on
the stored On-center spacing), listed below.
Press Result
1 Arc Length or Degree of Arc (ARC)
2 Chord Length (CORD)
3 Segment Area (SEG)
4 Pie Slice Area (PIE)
5 Segment Rise (RISE)
6 Stored On-Center Spacing (OC)
7 Length of Arched Wall 1* (AW 1)
* The calculator will calculate arched segment wall lengths (if
applicable) with consecutive presses of the a key until it reach-
es the last wall length.
R Run (Chord Length) — Enters or calculates the
Chord Length . Used in conjunction with an entered
segment rise to solve for the radius of a circle or
with an entered radius to solve for the segment rise.
r Rise (Segment Rise) — Enters or calculates the
segment rise . Used in conjunction with an entered
Chord Length to solve for the radius of a circle or
with an entered radius to solve for the Chord Length.

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Column/Cone Function
The Column and Cone function helps you quickly estimate volume
and surface area of columns or cones.
Ç C Column and Cone (Column/Cone) — With an
entered diameter and height, the first and second
presses of C(following Ç) will calculate the
total volume and surface area of a Column ; the third
and fourth consecutive presses of Ccalculate the
total volume and surface area of a Cone .
For Trig Model (#4080) Users:
As this model does not have a h key, you must enter the height using the r key.
Compound Miter/Crown Moulding Keys
The Construction Master Pro also calculates compound miter cut
angle solutions for cutting and installing crown moulding on a wall.
The Compound Miter function can also be used for finding angle
cuts for many types of compound miter problems, such as siding,
railing and trim.
 Compound Miter — With stored spring (crown)
angle and entered wall corner angle*, consecutive
presses of Âwill calculate the following:
Press Result
1 Miter Angle (MITR)
2 Bevel Angle (BEVL)
3 Redisplays Stored Spring Angle (SPRG)
4Redisplays Entered Wall Corner Angle (CRNR)
* Wall Corner Angle entries of less than 25 into  will be
assumed to be the number of sides of a polygon; in this case, the
calculator will calculate the unknown Wall Corner Angle first, then
proceed with the above angle calculations.
ß Â Store Spring Angle (Spring Angle) — Stores a
value other than the default spring (crown) angle of
45° (e.g., 3 8 ß Â stores 38° spring angle).
This value is permanently stored until you change it
or perform a Clear All (Ç x). To recall the stored
setting, press ® Â.

U SER ’ S G UIDE — 9
Drywall Function (NOT AVAILABLE ON TRIG MODEL #4080)
Ç h Drywall Sheets (Drywall) — Calculates the number
of 4 x 8, 4 x 9, and 4 x 12 sheets for an entered or
calculated area.
Footing Function (NOT AVAILABLE ON TRIG MODEL #4080)
The Footing function helps you quickly estimate the volume of
concrete required for concrete footings.
Ç W Footing — Calculates total quantity of concrete
required for concrete footings based on an entered
wall length and footing size. Size based on the
default footing size of 264 Square Inches (industry
standard).
ß 6 Store Footing Area (Ftg Area) — Used to store a
value other than the default footing size of 264
Square Inches (e.g., 1 2 8 i i ß 6
stores a footing size of 128 Square Inches). This
value is permanently stored until you change it or
perform a Clear All (Ç x). To recall the stored
setting, press ® 6.
Polygon Function
The Polygon function is handy for calculating multi-sided shapes
(such as found in concrete applications).
Ç R Polygon — With an entered diameter or radius and
number of sides of a polygon-shaped figure, Ç
R, calculates the following:
Press Result
1 Full Angle (FULL)
2 Bi-Sect, or Half Angle (HALF)
3 Side Length (SIDE)
4 Perimeter of Polygon (PER)
5 Area of Polygon (AREA)
6 Radius* (RAD)
7 Redisplays Entered Number of Sides (SIDE)
*Solves radius for an entered diameter or redisplays the entered
radius.

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Right Triangle/Roof Framing Keys
Right Triangle:
Using the Pythagorean theorem, the top row of keys on your
Construction Master Pro will calculate instant solutions in dimensional
format to right triangle problems (particularly, roof framing).
The Construction Master Pro’s keys are labeled in easy to remember
roofing terms. The right triangle is calculated simply by entering two
of four variables: Rise, Run, Diagonal, or Pitch.
p Pitch — Enters or calculates the Pitch (slope) of a
roof (or right triangle). Pitch is the amount of “rise”
over 12 Inches (or one meter) of “run.” Pitch may be
entered as:
• a dimension: 9 i p
• an angle or degrees: 3 0 p
• a percentage (percent grade): 7 5 % p
• a pitch ratio: 0 • 7 5 Ç p
Once a Pitch in one of the above formats is entered,
consecutive presses of pwill convert to the
remaining Pitch formats listed above (e.g., Pitch in
Inches will convert to Pitch Degrees, Percent Grade
and Pitch Ratio/Slope).
Note: An entered (vs. calculated) pitch is a permanent entry. This
means that it will remain stored even after you turn the calculator
off. To change the Pitch, simply enter a new Pitch value.
In contrast, a calculated Pitch value is not permanently stored.
This means that the calculator will return to the Pitch value you
last entered when you clear the calculator or press o twice.

U SER ’ S G UIDE — 11
Ç p Pitch Ratio or Slope (Slope) — Enters the Pitch as
a ratio or Slope of a roof (or right triangle). For
example, 0.58 slope is entered as • 5 8 Ç
p.
r Rise — Enters or calculates the Rise or vertical leg
(height) of a right triangle.
R Run —Enters or calculates the Run or horizontal leg
(base) of a right triangle.
d Diagonal — Enters or calculates the diagonal leg
(hypotenuse) of a right triangle. Typical applications
are “squaring up” slabs or finding common rafter
lengths. Additional presses of the dkey will also
display plumb and level cut angles in degrees.
Note: The Common rafter calculation is the “point-to-point” length
and does not include the overhang or ridge adjustment.
Hip/Valley and Jack Rafter Keys
The Construction Master Pro uses the Rise, Run, Diagonal, Pitch
and On-center spacing values to calculate Regular and Irregular
Hip/Valley and Jack rafter lengths (excluding wood thickness, etc.).

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When calculating Regular and Irregular Jack rafter lengths, you will
see the letters “JK” (Regular 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 or Irregular
Hip/Valley rafter length.
•Regular Hip/Valley Length: After right
triangle/rafter values are entered or calculated
(e.g., Pitch, Rise, Run), pressing Hwill calcu-
late the length of the Regular Hip/Valley rafter.
•Irregular Hip/Valley Length: If an irregular
pitch is entered (see next definition), pressing
Hwill calculate the Irregular Hip/Valley rafter
length. (An Irregular or “non-standard” roof has
two different Pitches/Slopes.)
• Subsequent presses of the Hkey will also
display plumb, level, and cheek cut angle values
in degrees.
Ç H Irregular Pitch (Ir/Pitch) — Enters the irregular or
secondary pitch value used to calculate lengths of
the irregular hip/valley and jack rafters.
You may enter the irregular pitch as:
• a dimension: 9 i Ç H
• an angle: 3 0 Ç H
• a percentage: 7 5 % Ç H
Note: An entered irregular pitch can be recalled by pressing ®
Ç H .
j Jack Rafters — Finds the descending Jack rafter
sizes for regular pitched roofs, based on the stored
On-center spacing and previously entered or calcu-
lated right triangle/rafter values (e.g., pitch, rise, run).
Repeated presses of the j key will display the incremental
jack adjustment, all the rafter sizes (on the Regular pitch side) as
well as display the plumb, level, and cheek cut angle values.
Additional presses will display the rafter sizes on the Irregular
pitch side (if an Irregular Pitch was entered; see above), or
repeat the previously displayed values.
(Cont’d)