b"ROOF ALTERATIONSNRC CONSULTATION WITH INDUSTRYto Develop a Framework for Roof AlterationsBY FLONJA SHYTI, MASC., AND BAS BASKARAN, PHD, P.ENG.T heNationalBuildingCodeofTo rehabilitate a building; Guidelines for Application ofCanada(NBC)providesspecifi- To change the use of a building; Part 3 of the National Building cationsfornewroof construc- Code of Canada to Existing tion.WhenapplyinganalterationtoTo build an addition; and Buildings1 anexistingbuilding,itmaynotmeetWhen the enforcement authorityCommentary titled Application requires alterations for public all the requirements of the latest code.of NBC Part 4 of Division B Thealterationmustbesuchthatthesafety (A-1.1.1.1. (1)). for the Structural Evaluation and performance is improved in a cost-ef- TheNBCalsodirectsuserstoaUpgrading of Existing Buildings fective and practical manner. The NBCnumber of publications that aim to aidof the Structural Commentaries provides examples of when the code canthe user in the application of alterations(User's GuideNBC 2015: Part 4 be applied to existing buildings: to existing buildings: ofDivision B) 216 lROOFINGBClFALL 2022"