b'ROOF ALTERATIONSCBD 230, Applying Building Codes to Existing Buildings 3However,inalltheabovepublica-tions there is a lack of clear guidance and code requirements for altering existing roofs. A similar message is highlighted in the report released by the Canadian Commission on Building and Fire Codes in2019titledAlterationstoExisting Buildings. The report also highlights the absence of a unified practice of applying alterations to existing buildings. 4From a nationwide survey within the roofingcommunity,over75percentFigure 1: Survey outcome for developing a retrofitting standard/specification for inclusion in the NBCC.of responders (Figure 1) favoured the development of a standard or specifica-tion for alterations to existing roofs.Roof ConsultingAlso,thesurveyhighlightedthat Canadiannewconstructionisless than 40 per cent of the roofing market share,whileretrofitsofexistingroofs takeamajormarketshare.Therefore, the development of holistic provisions for alterations of existing roofs would greatly assist practitioners.Another element that is currently not covered is that of future climate adap-tation when roofs are altered. For new roofs,thereiscurrentlyCSAA123.26 Performance requirements for climate NRC CONSULTATIONresilienceoflowslopemembrane roofing systems, which provides guid-ance for climate adaptation. TheNationalResearchCouncilof WITH INDUSTRY Canada (NRC) is currently undertaking a major R&D project to develop holistic provisionsforalterationstoexisting commercial roofs for climate adaptation. Therefore,existingroofsundergoing alterationswouldmeetfutureclimatic load requirements. Existing roofs can be classified into three groups:Minimal intervention required Roof Condition Assessments & SurveysRoof System Design & Contract ManagementGreen Roof DesignMajor intervention required Failed Warranty & Maintenance ReviewInfrared ThermographyThe current framework will addressRoof Access & Fall Protection - Design & Testingroofs that have failed. Roofs that requireRoof Asset Management & Capital Planningminimal intervention due to a change inRCABC Approved Observersthe building use or occupancy, a planned alteration as part of a roof maintenance programandanincreaseinbuildingCreative Thinking Practical Resultsperformance requirements will also be addressed. The framework will addressVancouver & Surrey 604-738-0048 Victoria 250-386-7794 rjc.caroofs requiring major intervention at aNanaimo 250-716-1550Kelowna 778-738-1700later stage. www.rcabc.orgl17'