b'BUILDING CODEUNDERSTANDING THE BRITISH COLUMBIA BUILDING CODEPA R T 3 : R O O F D E S I G N : F R O M C O D E T O S P E C I F I C AT I O NBY JAMES KLASSENT hisisthethirdpartofamulti- aboutthebuildingenclosure.Inthis(aWhen we refer to the Design Authority part series on the Building Codethird article, we address the fundamentalterm used in the Roofing Practices and roofing: question of design responsibility. Manual),wemeananyonewhotakes Part 1: Understanding the responsibility for the design of a roof BC Building Code Whos in Charge Here? system.Thetermdesignerusedin Part 2: The Building Code and wind Lookingbackatthepreviousarticle,thecodeimpartsthesamemeaning. weknowthatPart5inDivisionBRegardlessofnewconstructionor Part 3:Roof Design: from contains new language (in 2018) aboutreplacement work 2 , the Design Authority Code to specification roofdesignthatprovidestwopath- could be any of the following:You can find these articles in bothways by which a roof system design canArchitectthe printed and digital editions of Roofingconform to the code. What exactly doesEngineerBC,thetrademagazinepublishedbyit all mean for the design process? More the RCABC (the digital version is avail- importantly,whoisresponsibleforRoofing Consultantablethroughourwebsite:www.rcabc. the design? Roof Manufacturer / Supplierorg/publications). You can also watchThequestionofresponsibilityhasRoofing Contractorthevideopresentation,BlownAway:notbeenadequatelyansweredinpastBuilding OwnerCodeRequirementsforMembraneyears. Some designers provide detailed Roofs, that addresses several articles in specifications that include Specified WindSo,whatmakesanyoneofthese this series. Load values, but examples are rare. Manypeoplepotentiallyresponsibleforthe In the second article of this serieshold that the roof design can be assigneddesign? The answer to that question, as on the British Columbia Building Code,to the roofing contractor. Assigned orwe will discover, is in the code.we examined why wind matters, locatedDelegated Design to constructors is aArticle 5.2.2.2. in Division B refers code requirements for membrane roofscommonpractice 1 .Butistheassign- directly to Article 4.1.7.1., Specified Wind anddiscoveredthatroofdesignisasmentofstructuraldesignpermissibleLoad.RecallingthatthetermSpecified muchaboutstructuraldesignasitisunder the code? WindLoadismentionedinSentence 16lROOFINGBC l FALL 2021'