MCOM

This routine will calculate a detailed set of lengths for a common-pitched roof given:- Pitch- Span in FIS (Feet Inch Sixteenths)- Ridge Thickness in Inches- HAP in Inches (Height Above Plate; i.e. Heel Height)- OHang in Inches (finished total overhang run)- Wall Sheathing Thickness in Inches- Roof Sheathing Thickness in Inches- SubFascia Type Height in Inches (i.e. 2x4 = 3.5”)- Fascia Thickness in Inches (i.e. 1x8 = .75”)- Fascia Type Height in Inches (i.e. 1x8 = 7.25”)- Desired Fascia Reveal in Inches (how far down below the soffit the fascia reveal is)

Items calculated by this routine are:- Rafter length- Calculated Rise- Tail Cut (the along-the-top length of the rafter tail)- Total Board Length (rafter length + tail length; along-the-top of the board)- Order Lumber Size (rounded up to the nearest 2’ increment lumber size)- Half Span - cRun (the actual rafter run; from over outside of plate to face of ridge)- Scaffold Height (calculated for a 6’ tall framer; vertical length from rafter seat to foot of framer)- Ridge Height (vertical length from rafter seat to the top of the ridge: (cRise + HAP))

As with all of these routines, the user is “prompted” to enter the required numbers so that the calculation can be performed.

WALLMAXX, INC COPYRIGHT © 2012 ALL RIGHTS RESERVED

WALLMAXX, INC COPYRIGHT © 2012 ALL RIGHTS RESERVED

Here is what the actual routine looks like when keyed into the calculator.

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The keystrokes to enter/store in an HP scientific calculator in RPN mode are below:

<< “Pitch” “” INPUT OBJ ‘G’ STO G G 12 / ‘C’ STO “Span FIS” “” INPUT OBJ INSH 2 / ‘H‘ STO“RIDGE THKNS IN” “” INPUT OBJ 2 / ‘L‘ STO “HAP IN” “” INPUT OBJ ‘W‘ STO “OHANG IN” “” INPUT OBJ ‘V’ STO“WSHTTING” “” INPUT OBJ ‘T’ STO“RSHTTING” “” INPUT OBJ ‘K’ STO“SFASCIA TYPE HT IN” “” INPUT OBJ ‘R’ STO“FASCIA THKNS IN” “” INPUT OBJ ‘A’ STO“FASCIA TYPE HT IN” “” INPUT OBJ ‘B’ STO“FASCIA REVEAL IN” “” INPUT OBJ ‘D’ STO

H .75 - SWAP 12 / ATAN COS INV * ‘U’ STO

U FEET DUP ‘O’ STO ‘RAFTER‘ TAG

C H L - * FEET ‘CALCRISE‘ TAG

T V + 1.5 - C ATAN COS INV * ‘J’ STO J FEET ‘TAILCUT‘ TAG

U J + FEET ‘TOTALBD’ TAG

U J 6 + + FEET ‘ORDRLMBR’ TAG

H FEET ‘HALFSPAN’ TAG

H L - ‘M’ STO M FEET ‘RAFTRUN’ TAG

C H * 74 - FEET ‘SCAF’ TAG

C M * W + FEET ‘RIDGEHT’ TAG

V A T + + C * R W - + K C ATAN COS / - ‘E’ STO E FEET ‘CBNDFLSH’ TAG

CLEER >>

WALLMAXX, INC COPYRIGHT © 2012 ALL RIGHTS RESERVED