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38、a.caor call toll-free 1-800-463-6727 or 416-747-4044.TMA trade-mar k of the Canadian S tandards Association,operating as “CSA Group”Prepared byApproved byManaging changing snow load risksfor buildings in Canadas NorthCAN/CSA-S502-14National Standard of CanadaCAN/CSA-S502-14Managing changing snow loa
39、d risks for buildingsin Canadas NorthDecember 2014 2014 CSA Group 1ContentsTechnical Committee on Northern Built Infrastructure 3Working Group on Changing Snow Loads in the North 5Preface 60 Introduction 70.1 General 70.2 Overview 71 Scope 71.1 General 71.2 Exclusions 71.3 Terminology 82 Reference p
40、ublications 83 Definitions 94 Snow overload planning and maintenance 104.1 General 104.2 Pre-season roof snow removal planning 104.2.1 General 104.2.2 Buildings already identified under snow overload watch programs 104.2.3 Snow removal plan 104.3 Building maintenance practices to reduce risk of coll
41、apse 114.3.1 Building modifications that increase risks 114.3.2 Maintenance practices 114.4 Roof snow monitors and their installation 114.5 Snow overloading risks accentuated by nearby higher buildings 124.6 Diversion of melt water from roof and building 124.7 Reducing sliding snow and ice 124.7.1 S
42、now guards 124.7.2 Restricted areas 124.8 Design changes 125 Detection, monitoring, and assessment of snow overloading risks for buildings 125.1 General 125.2 Monitoring snow conditions 135.3 Measuring snow on the ground in the community 135.3.1 General 135.3.2 Community snow measurements 135.3.3 Sn
43、ow measurement equipment 135.3.4 Snow depth measurements 145.3.5 Snow water equivalent measurements 145.4 Assessment of risks from heavy snow conditions 145.4.1 General 14CAN/CSA-S502-14Managing changing snow load risks for buildingsin Canadas NorthDecember 2014 2014 CSA Group 25.4.2 Detection of he
44、avy snow conditions 155.4.3 Roof snow load inspections 155.4.4 Buildings already designated under snow overload watch programs 155.4.5 Building Documentation 155.5 Warning signs and responses to imminent risks for snow overloading 155.5.1 Warning signs 155.5.2 Building evacuation 165.5.3 Documentati
45、on 165.5.4 Marking of the building 165.5.5 Structural evaluation 165.6 Building classification and marking for snow overloading risks 165.6.1 General 165.6.2 “Unsafe” classification 175.6.3 “Safety uncertain” classification 175.6.4 “Safe” classification 176 Snow removal from roofs 176.1 Adverse weat
46、her conditions 176.2 Timing 186.3 Secured areas 186.4 Permafrost and drainage 186.5 Roof Hazards 186.6 Warning sounds 186.7 Safety considerations 186.7.1 Snow removal 186.7.2 Safety measures 186.7.3 Access 196.7.4 Removal sequence 196.8 Equipment 196.8.1 Rakes and shovels 196.8.2 Aerial lifts 196.9
47、Roof snow and ice removal procedures 196.9.1 Work zones 196.9.2 Sequence 196.9.3 Limitations 20Annex A (normative) Commentary 22Annex B (informative) Buildings at greatest risk of snow overload roof collapse 26Annex C (informative) Snow accumulation measurements 28Annex D (informative) Building acce
48、ss markings 32Annex E (informative) Assessment form 37Annex F (informative) Snow loads, climate change and buildings: A Discussion 46Annex G (informative) Sample advisory on snow overload conditions 62CAN/CSA-S502-14Managing changing snow load risks for buildingsin Canadas NorthDecember 2014 2014 CS
49、A Group 3Technical Committee on Northern BuiltInfrastructureS. Brown Northwest Territories Association of Communities(NWTAC),Yellowknife, Northwest TerritoriesCategory: Owner/Operator/ProducerChairJ. Streicker City of Whitehorse,Whitehorse,YukonCategory: General InterestVice-ChairH. Auld Risk Sciences International,Ottawa, OntarioCategory: Supplier/Contractor/Consultant InterestS. Dueck Yukon Government Community Services,Whitehorse,YukonCategory: Regulatory AuthorityD.W. Hayley Hayley Arctic Geoconsulting,Kelowna, British ColumbiaCategory: Sup
