b'An important foundation element of this framework is industry consultation. This ensures a consensus-based, practical and applicable solution is developed for climate resiliency of existing commercial roofs through alterations.inHowever, in all the above publications there is a lack ofProtective Roofing 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 CodesSafety Products2019 titled Alterations to Existing Buildings. The re-port also highlights the absence of a unified practice of ap-plying alterations to existing buildings. 4From a nationwide survey within the roofing commu-nity, over 75 per cent of responders (Figure 1) favoured the development of a standard or specification for alterations to existing roofs. BYAlso,thesurveyhighlightedthatCanadiannewcon-struction is less than 40 per cent of the roofing market share, while retrofits of existing roofs take a major market share. Therefore, the development of holistic provisions for altera-tions of existing roofs would greatly assist practitioners.Another element that is currently not covered is that of future climate adaptation when roofs are altered. For new roofs, there is currently CSA A123.26 Performance requirementsforclimateresilienceoflowslopemem-brane roofing systems, which provides guidance for cli-mateadaptation.The National Research Council of Canada (NRC) is currently undertaking a major R&D project to develop ho-listic provisions for alterations to existing commercial roofs for climate adaptation. Therefore, existing roofs undergoingThe PR 100 Guardrail Systemalterations would meet future climatic load requirements. Existing roofs can be classified into three groups: is an efficient and practical perimeter guardrail that allows youMinimal intervention required; to work right to the edge of the roof.Major intervention required; orMeets and exceeds OSHA & WCB requirementsFailed.Accommodates: parapets and cant stripsEasy to installThecurrentframeworkwilladdressroofsthathave failed. Roofs that require minimal intervention due to a Provides unobstructed access to roof edgechange in building use or occupancy, a planned alteration as part of a roof maintenance program and an increase in building performance requirements will also be addressed. The framework will address roofs requiring major interven-tion at a later stage.Animportantfoundationelementofthisframework is industry consultation. This ensures a consensus-based, practical and applicable solution is developed for climate resiliency of existing commercial roofs through alterations.The framework of the work has four steps, and each of the four steps is described in more detail below:Step 1: Determination of Future Climatic Load Re- The PR 600 Mobile Fall Protection System quirements; can be moved along the roof by pulling the cart to the desired working location,Step 2: Determination of the Existing Condition;Step 3: Identification of Alteration Options; and providing a safe working area. The PR 600 meets O.S.H.A. compliance 1926.502D. Step 4: Verification of the Alteration. STEP 1: Determination of Future Climatic LoadRoofing & Sheet Metal Super Service CentresRequirements EDMONTON, AB CALGARY, AB WINNIPEG, MB WESTON, ONThe web tool Climate-RCI provides future load projec- (780) 432-2786 (403) 255-8236 (204) 338-7613 (Weston Road)tions for 678 locations across Canada. This step is neededBARRIE, ON HAMILTON, ON TORONTO, ON (416) 745-4111to determine the future climatic load requirements the roof(705) 792-6683 (905) 560-2858 (416) 534-8421will need to withstand. By providing the location of theWESTON, ONbuilding and the global warming magnitude, the climateOAKVILLE, ON PICKERING, ON LONDON, ON (Signet Drive)zone severity along with the design parameters are identi- (905) 825-0034 (905) 426-4443 (519) 668-3626 (416) 744-2050fied for wind, rain and temperature. A global warming value of 2 Cwhich has been selected for CSA A123.26canwww.sparmarathon.cabe used, but other global warming values ranging from 0.5 ORN THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ONTARIO ROOFING NEWSISSUE 1 202315'