IRWINÂ® Rafter Square Reference Guide Complete Instruction Book ...

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IRWIN ® RAFTER SQUARE REFERENCE GUIDEProfessional tradesmen use Rafter and Framing Squares to save time on roofconstruction projects. All of the necessary cuts for a particular rafter can be laidout with these two squares. This reference guide will provide a basic knowledge ofrafters and the rafter square to help you determine what scale and number on thesquare to use, as well as all necessary tables for reference.CONTENTSDiagram of Rafter Square.............................................2Types of Rafters ....................................................3Using the Rafter Square ..............................................6Common Rafters....................................................9Common Rafter Layout ....................................10Hip and Valley Rafters ..............................................13Hip Rafter Layout ........................................15Valley Rafter Layout ......................................17Jack Rafters ......................................................19Jack Rafter Layout .......................................21Dormer Rafters....................................................22Degree Scale......................................................23Rafter Length Tables................................................241
DIAGRAM OF RAFTER SQUAREMARK ALONGTHIS EDGEINCH SCALERAFTER SEATNOTCH CUTHIP AND VALLEYRAFTER SCALE( TOP CUTS )SCRIBINGSLOTS( SPACED ¼” )INCH SCALE12 3 4 5 6HIP - VAL TOP CUTSCOMMON TOP CUTSSEAT CUTSPROTRACTOR/DEGREE SCALE1 2 3 4 5 6 7 8 10 12 15 18 24 301 2 3 4 5 6 7 8 10 12 15 13 24 30COMMON RAFTERSCALE ( TOP CUTS )5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 DEGFOOT[Diagram 1 – IRWIN Rafter Square]2
Page 1: IRWIN ® Rafter Square Reference Gu
Page 5 and 6: [Fig. 1 - Types of Rafters - 3D]DOR
Page 7 and 8: USING THE RAFTER SQUAREThe use of t
Page 9 and 10: [Fig. 4 - The Common Rafters]PLUMB
Page 11 and 12: Common Rafter Layout1. Top Plumb Cu
Page 13 and 14: HORIZONTAL ORBOTTOM CUT[Fig. 8a - S
Page 15 and 16: BEVEL CUT[Fig. 10 - Hip Rafter Layo
Page 17 and 18: 3. Tail or Bottom Plumb Cut: Measur
Page 19 and 20: RIDGE[Fig. 12 - Top View ofValley R
Page 21 and 22: [Fig. 14 - Top Viewof Hip Jack Raft
Page 23 and 24: DORMER RAFTERSWhen remodeling or ad
Page 25 and 26: 1 INCH RISE 1-12 PITCH 4 3 ⁄4 DEG
Page 27 and 28: 3 INCH RISE 3-12 Pitch 14 DegreesCo
Page 29 and 30: 5 INCH RISE 5-12 PITCH 22 1 ⁄2 DE
Page 31 and 32: 7 INCH RISE 7-12 PITCH 30 1 ⁄4 DE
Page 34 and 35: 10 INCH RISE 10-12 PITCH 40 DEGREES
Page 38 and 39: 14 INCH RISE 14-12 PITCH 49 1 ⁄2
Page 48: 24 INCH RISE 24-12 PITCH 63 1 ⁄2

IRWINÂ® Rafter Square Reference Guide Complete Instruction Book ...

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