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IRWIN Rafter Square Reference Guide

IRWIN Rafter Square Reference Guide

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in inches per foot run The Inch Rise gives you the corresponding scale number to use on the square and is calculated as follows. Inch Rise, run, and the tables in the back of this guide are all that you need to layout rafter lengths and cuts for common, hip, valley, and jack rafters. RISE RUN A RUN B FOR EVEN PITCHED ROOFS RUN A = RUN B R A R B ...

  Foot, Per foot

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