b'BUILDING CODEUNDERSTANDING THE BRITISH COLUMBIA BUILDING CODEPA R T 2 : T H E B U I L D I N G C O D E A N D W I N DBY JAMES KLASSENT his is the second part of a multi- But, a poorly designed and constructedforce from the wind and the failing roof part series on the Building Codemembraneroofcansuccumbtothewas so strong it pulled rooftop mechan-and roofing: powerful uplift forces of wind, leavingicalequipmentaway,leavinggaping Part1:UnderstandingtheB.C.thebuildinginteriorvulnerabletotheholes through the deck. One employee Building Code weather.Flyingroofmaterialcanalsowasnearlycrushedintheparkinglot Part 2: The Building Code and Wind poseaseriousrisktopublicsafety.byfallingroofmaterials.Roofdebris Part3:DesignResponsibility:fromDesigningawind-resistantmembranescattered across the street and down the Code to Specification roof system is prudent. It is also a Codeblock. Moments later, rains followed.requirement. In this article on the BritishThisisjustonestory.Thereare YoucanfindthesearticlesinbothColumbia Building Code, we look at whyothers.Andallofthemmighthave theprintedanddigitaleditionsofwind matters and what the Code has toendeddifferentlyhadtheroofbeen Roofing BC the trade magazine publishedsayaboutwind-resistantmembranedesigned and built to resist strong wind 1 . by RCABC (the digital version is availableroofs for Part 3 buildings. Of course, insurance often pays for wind throughourwebsite:www.rcabc.org/publications).YoucanalsowatchtheWhy Wind Mattersvideo presentation, Blown Away: Code1 Strong wind events are considered rare (1 in 50 years),On July 18, 2019, a severe windstormbut roof design must allow for the possibility. As our Requirements for Membrane Roofs, thatblewthroughpartofSaskatoon,climate changes, these events are occurring with addresses several articles in this series. Saskatchewan.Windsregistering85increasing frequency. In 2019, a severe windstorm hammered the British Columbia south coast region with Membraneroofsareubiquitousonkm/hinthevicinityrippedawaythewinds topping 100 km/h. It has been called the worst industrial, commercial and institutionalentiremembranerooffromthesteelstorm in the provinces history, and Environment Canada buildings and cover many multi-familybuilding occupied by EFL Flooring. Thepredicts more like it in the future (https://www.vicnews.com/news/its-been-one-year-since-the-most-destruc-and some single-family Part 9 structures.roof system was lifted off en masse. Thetive-wind-storm-hit-b-c-s-south-coast/).14lROOFINGBC l SUMMER 2021'