PO2C

This routine will calculate detailed rafter information for a roof system where a porch roof intersects with a pitched roof, given:

- Main Roof Pitch- Porch Roof Pitch- Porch Run FIS- Main Rafter Depth (i.e. 2x6 = 5.5; 2x8 = 7.25; 2x10 = 9.25)- Plate Height Difference in Inches

Items calculated by this routine, in no particular order, are:- Total Porch Rafter Length to include additional length for face nailing to main roof rafters.- Intersection point to mark on top edge of main roof rafters.- Scaffold Height - from top of main plate height to bottom of framer’s foot.

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

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Given:Main Pitch! 8:12Porch Pitch! 4:12Porch Run FIS ! 8-0-0Main Rafter Depth! 5.5 inchesPlate Difference! 12 inches

Returns:Top Cut Angle ! 15.255118˚Top Cut Seat Angle ! 3.2727:12Rafter ! 13-8-7Total Rafter! 15-5-5Mark Main! 6-0-2Scaffold! -1-10-0

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:

<< “MAIN PITCH” “” INPUT OBJ 12 / ‘D’ STO“PORCH PITCH” “” INPUT OBJ 12 / ‘A’ STO“PORCH RUN FIS” “” INPUT OBJ INSH ‘R’ STO“MAIN RAFTER DEPTH INCH” “” INPUT OBJ ‘E’ STO“PLT DIF INCH” “” INPUT OBJ ‘P’ STO

90 A - 90 D - - ‘S’ STOS ‘TOPANGLE’ TAGS TAN 12 * ‘SEATCUTTOP’ TAGR P D TAN / - ‘B’ STOB 180 A S + - SIN * S SIN / ‘C’ STOC FEET ‘RAFTER’ TAGC E S SIN / + FEET ‘TOTALRAFT’ TAGB A SIN * S SIN / P SQ R B - SQ + √ - FEET ‘MARKMAIN’ TAGC A SIN * 76 - FEET ‘SCAF’ TAG

CLEER >>

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