ß 5
Note: You may set your calculator to display the Jack Rafter lengths in either ascending or descending order (see Preference
Settings on page 83 ).
Note: You may set your calculator to “mate up” with the Jack
Rafters, rather than using the entered or default On-center spacing for both sides (see Preference Settings on page 83 ).
Store On-center (o.c.) Spacing — Used to store a value other than the default of 16 Inches On-center
(e.g.,
1 8 i ß 5
stores an 18-inch
On-center) for Jack Rafter calculations. Press
®
5
to review the stored value.
Ç j Irregular Side Jacks (Ir/Jack) — Operates same as j
, but displays the rafter values from the
Irregular pitched side first.
Rake-Wall Function
Ç r
Rake-Wall (R/Wall) — This function finds the stud sizes in a Rake-Wall based on calculated or entered values for pitch, rise and/or run. Repeated presses of r
will display the various sizes. The sizes can be displayed in either descending (from longest to shortest) or ascending (from shortest to the longest) order, depending upon your preference setting (see
Preference Settings on page 83 ). If a dimensional value is entered before pressing
Ç r
, this value will be taken as the Rake-Wall base size and automatically added to the various rafter lengths.
ß 5 Store On-center (o.c.) Spacing — Used to store a value other than the default of 16 Inches On-center
(e.g.,
1 8 i ß 5
stores an 18-inch
On-center) for Rake-Wall stud calculations. Press
® 5
to review the stored value.
User’s Guide — 13
Roof Materials/Covering Function
The Construction Master Pro's Roof function provides a quick calculation of roof area, number of squares and bundles, and number of
4 x 8 sheets required for roof coverage.
Ç d Roof — Given an entered Pitch (or Rise and Run) and plan area (or Length and Width), calculates the following:
2
3
4
5
Press Result
1 Roof Area (ROOF)
Number of Roof Squares (SQRS)
6 Pitch
7
Number of Roof Bundles (BNDL)
Roof Bundle Size* (B-SZ)
Number of 4 x 8 Sheets (4 X 8)
(PTCH)
Plan Area (PLAN)
*Roof bundle size is 33.33 Square Feet.
Stair Key
The Construction Master Pro easily calculates stair layout solutions.
With entered values for floor-to-floor rise and/or run, it will calculate
Riser, Tread, Stringer, and Incline Angle values simply by pressing the s key.
s Stair — A multi-function key that uses a stored Riser
Height, stored Tread Width, stored Headroom Height and Floor Thickness, and entered Rise and Run values to calculate and display the following:
Press Result
1 Actual Riser Height (R-HT)
Number of Risers (RSRS)
6
7
8
9
10
11
2
3
4
5
Riser Overage/Underage
Tread Width (T-WD)
Number of Treads
Stairwell Opening
Stringer Length
Incline Angle*
Run of Treads
Floor-to-Floor Rise
(TRDS)
Tread Overage/Underage
(OPEN)
(STRG)
(INCL)
(RUN)
(RISE)
(R+/-)
(T+/-)
14 — Construction Master TM Pro / Trig / Desktop
ß 7
Press Result
12
13
14
15
Stored (Desired) Tread Width
Stored Headroom (HDRM
Stored Floor Thickness
(R-HT
STORED
(T-WD )
STORED
(FLOR
)
STORED
)
)
Note: Default values are 7-1/2 Inches for Desired Riser Height and 10 Inches for Desired Tread Width, 10 Inches for Floor
Thickness, and 6 Feet 8 Inches for Headroom Height.
Note: It is not possible for the calculator to include the nose/overhang measurement. Thus, you need to adjust for this measurement per local codes.
*If the inclination angle exceeds the stored riser height and Tread
Width ratio by 10%, the yield symbol will appear, indicating a steep incline.
Store Desired Riser Height (Riser Ht) — Stores a value other than the default desired stair riser height of 7-1/2 Inches (e.g.,
8 i ß 7
stores an
8-inch desired stair riser height). To recall the stored setting, press
® 7
.
ß 8
ß 9
Store Floor Thickness/Height (Floor Ht) — Stores a value other than the default desired floor thickness of 10 Inches (e.g., 8 i ß 8 stores an 8-inch desired floor thickness). To recall the stored setting, press ® 8 . This is used, along with stored headroom height, for calculating the length of the stairwell opening.
Store Desired Tread Width (Tread W) — Stores a value other than the default desired stair Tread Width of 10 Inches (e.g., 1 2 i ß 9 stores a
12-inch desired stair Tread Width). To recall the stored setting, press ® 9 .
Ç ß ß Set Headroom Height — Sets the desired
ß ß Headroom Height for calculation of the stairwell opening. Default is 6 Feet 8 Inches.
Use the + key to increase and the – key to decrease the stored headroom height. See Preference Settings instructions on page 86 .
(Cont’d)
User’s Guide — 15
