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This Technical Note provides recommendations for field notching, tapering and drilling glulam beams. Beams illustrated herein are assumed to be simple span subjected to uniform loads, and are shown with the compression side up. All equations and notching guidelines are presented using the same assumptions. If this information is applied to continuous or cantilevered beams, it should be used with extreme caution and only after careful analysis based on sound engineering judgment. It is important to understand that improperly made field notches or holes may reduce the capacity of a properly designed member, possibly causing structural failure. The effects of any field notching or drilling should be checked by a designer competent in engineered timber design. This standard is refererence in the 2012 IBC.