b'BUILDING CODEwith regard to wind up-lift imposed on roofing. In Section 5.2. Loads and Procedures 12we find the grailArticle 5.2.2.2.Determinationof WindLoads. Article5.2.2.2.dealswithmembrane roofsystemsthatseparatedissimilar environmentsorareexposedtothe exterior, and which may be subject to wind load, and[are] required to be designed to resist wind load. The Article is reproduced below; blue text in the Code indicates new material introduced in the Code in 2018.5.2.2.2. Determination of Wind Load(See Note A-5.2.2.2.)1.ThisArticleappliestothedeter-mination of wind load to be used in the design of materials, compo-nents and assemblies, including their Image: membrane roof (by author). connections, that separate dissimilar environments or are exposed to the roofsystems 11 ,therequirementsforor issue, like Heat Transfer or Air Leakage,exterior, where these area. Subject to wind load, andmembrane roofs employed on both Partrather than on a type of assembly, such 3andPart9buildingsfindcommonas walls or the roof. A brief examina- b. Required to be designed to resist ground in Division B, Part 5, which istion ofSection 5.6. Precipitationwind load.where we now turn. offers little about roofs beyond several2. ExceptasprovidedinSentence broadfunctionalstatementsaroof Part5(DivisionB)Environmental(3),thewindloadreferredtoin Separation is comprised of 10 sections,mustminimizeingressofprecipita- Sentence (1) shall be 100% of the each focused on a performance criteriontion into the component or assemblyspecified wind load determined in (dont all roofs have to do this?) and itaccordance with Article 4.1.7.1.11 Division B, Part 9, Section 9.26. Roofing states thatmust prevent ingress of precipitation3. Where it can be shown by test or intointeriorspace(yes,itsaysthat). roofing shall be used to prevent the ingress ofanalysisthatamaterial,compo-water and moisture into building assemblies andNothing is said about wind.occupied space, and that this can be accomplishedIn Section 5.1. General, we find anent,assemblyorconnection by conforming to the remainder of Subsection 9.26.1.referred to in Sentence (1) will be General, or by conforming to Part 5. This reference tofew clues to the subject of wind. Articlesubject to less than 100% of the Part 5, then, provides one of several points of connec- 5.1.4.1. addresses environmental loads. tion between Part 3 and Part 9 buildings (compare withspecified wind load, the wind load Division A, Part 1, Section 1.3. Divisions A, B and CThat looks promising since wind is anreferred to in Sentence (1) shall not of this Code: 1.3.3.2. Application of Parts 3, 4, 5environmental phenomenon. A quick and 6). Since the only other references in subsectionread leads us further along in our quest:12 British Columbia Building Code, Division B, Part 59.26.1. pertain to the installation of asphalt shingles,Environmental Separation: Section 5.2. Loads and membrane roofs on Part 9 buildings must be designedroofingmustbedesignedtoconformProcedures (https://free.bcpublications.ca/civix/docu-using the requirements in Part 5. to the requirements in Subsection 5.2.2.ment/id/public/bcbc2018/bcbc_2018dbp5s52).Bothwell-Accurate has enjoyed 90 successful years in business and now employs over 500 professionals to meet all your waterproofing, architectural metal and roofing project requirements. With a management team that represents some ofthemostexperiencedprofessionalsintheindustry,andmorethan60,000 completedprojects,weareoneofCanadasoldestandmostexperienced construction firms. We proudly service our growing roster of industrial, commercial and institutional clients proving innovative, superior installations in the lower mainland and interior of British Columbia and across Ontario.604-282-7960bcestimating@bothwell-accurate.combothwell-accurate.comwww.rcabc.org l17'