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4 M.:.. Buitdin Permit.com <br /> y a service of eCityGov.net Construction Tip Sheet 11 <br /> Notching and Boring of Framing Members <br /> This Tip Sheet reflects code requirements of the 2018 International Residential Code (IRC)with <br /> Washington State Amendments. <br /> 13 I r 3 <br /> i Dm <br /> D . ,I0/4 K,; No Notches Permitted >i 1<-1.-->1 <br /> DID o,s <br /> In Middle 113 <br /> Max <br /> 1,,eirj D/6 Max(Bottom notch <br /> D/3 —only allowed on 2X and <br /> Max 3X members) <br /> Floor and Ceiling Joist Notching <br /> 4, <br /> 2"Min <br /> from DI3 <br /> 2*DI---L ..),,,t,„4 or Bottom <br /> ),‘ <br /> D/3-�' Miri <br /> Floor and Ceiling Joist Boring Holes <br /> D/4 Max measured , <br /> ,rat inside face of stud <br /> o <br /> Joist depth 24'Maximum <br /> Overhangat taper cot <br /> ,} <br /> 51 f"vSd� A '. <br /> Min II <br /> 3 rti 3/4 <br /> I ''''' *1E14 A r <br /> 4 <br /> Ceiling Joist Taper Cutting Rafter Notching <br /> Figure 1: Floor Joists, Ceiling Joists, and Rafters (per IRC R502.8 and R802.7) <br /> January 24,2021 MyBuildingPermit.com I Notching and Boring of Framing Members 1 <br /> eCityGov.net <br /> Z43,5retyttatAliance <br />