b'Technology V R= 72 km/h (45 mph) V D P R= 4.3 kPa (90 psf) P DCode requirementsV D= 101 km/h (63 mph) P D= 2.7 kPa (56 psf) CAN/CSA A123.24 V R= 109 km/h (68 mph) V DV D =101 km/h (63mph)P R= 4.3 kPa (90 psf) P D Design wind data from P D =-2.7 KPa (-56 psf)Building Code Figure 5: Output of Wind-RCI for vegetated roof assembly. Figure 6: Compliance verification process (NBCC 2020 vs CSA A123.24-21). CAN/CSA A123.24 Wind resistance calculationBVRA - 1BVRA - 2 Average vegetated system density,(gr/cm3)0.801.43plicates the NBCC for the wind3. Code ComplianceBaskaran,A.,Chavez,M.,Mol-Sustained speed of Specimens 1,2 and 3 (km/h)96, 87, 115151, 151, 165load requirements. leti, S. 2021. A New Test Methodol-V_average (km/h)99156VerificationAfterenteringthebuildingogyforWindResistanceEvaluation Coefficient of Variation0.120.04parametersintoWind-RCI,theToverifycodecompliance,of Built-up Vegetated Roof Assembly. Resistance factor, *0.610.79 Grow Factor Modifier, GFM*1.20.9design values for this case studybothresistancevalues(V R ,P R )Journal of Architectural Engineering, 27(3), VRA wind resistance calculation, (km/h)*72109resulted in: P D- Field = -1.1 kPamustbehigherthanthedesign04021019.*Please refer CSA A123.24 Annex A for details (-23 psf), P D- Edge = -1.4 kPa (-29values. In this case study, as shownCAN/CSA A123.21. 2020. Stan-psf) and P D- Corner = -2.7 kPa (-56in Figure 6, BVRA-2 meets the re- dard test method for the dynamic wind Table 1: Wind flow resistance of BVRA -1 and 2. psf), and the wind speed (V D ) = 101quirements of NBCC 2020. uplift resistance of membrane-roofing km/h (63 mph) at the roof heightThe CSA 123.24-21 test methodsystems. CSA group (www.csa.ca)Toillustratetheprocess,con-BuildingImportance:Nor- of the buildingsee Figure 5. is a practical engineering solutionCAN/CSA A123.24. 2021. Stan-siderthefollowingexample.Amal(asperTable4.1.7.3infordemonstratingVRAconfor- dard test method for wind resistance of designer wants to install a BVRANBCC 2020) 2. Resistance Values vegetated roof assembly. CSA group The project proponent has twoThe resistance values for BVRA- mance to code. The tool is intend- (www.csa.ca)on a building with the followingoptions:BVRA-1andBVRA-2.1and2aredeterminedusinged to help the green roof industryFLL. 2018. Guidelines for the Plan-specifications: The BVRA selection is based onCSA 123.24-21. For simplificationexploreinnovativedesignwhilening, Construction and Maintenance Location:Toronto(CityHall),ensuring that VRA integrity againstof Green Roofing.the three-step verification process: purposes, it is assumed that both Ontario BVRAs have the same membranewind effect forces is maintained.FM 1-35. 2007. Property Loss Pre- Roof: Low-slope (less than 7 o ) 1. Design Values roofingassembly,whichhasal- vention Data Sheets: Green Roof Sys-Geometry: Height = 15m (49 ft.),Thedesignvaluescanbeob- ready been evaluated in accordanceReferences tems (www.fmglobal.com). Width = 80m (263 ft.), Length =tained using NBCC 2020 or thewith CSA-A123.21-20 and provedMunicipality CodeChapter 492Wind-RCIcalculator.Wind-RCIto have an uplift resistance (P R ) ofANSI/GRHC/SPRIVR-1.Green Roof. 2017. City of Toronto.100m (328 ft.), and no parapets 2011. Procedure for InvestigatingToronto Green Roof Construction WindExposure:Urbanterrainisawebapplicationthatdeter- -4.3 kPa (-90 psf). mineswindloadsforroofclad- Table 1 summarizes wind flowResistance to Root Penetration onStandardSupplementary Guidelines. (asperClause4.1.7.3.5(b)indingandvegetatedroofassem- evaluation results. The table con- Vegetative Roof (www.spri.org). City of Toronto.NBCC 2020) blydesignparametersbasedoncludesthatV forBVRA-1andANSI/SPRI RP-14. 2016. WindMauricio Chavez and Bas Baskaran R Building Openings: Category 2 (asNBCC 2020. Note that the On- 2 are 72 km/h (45 mph) and 109Design Standard from VegetativearewiththeNationalResearchCouncil per Table 4.1.7.7 in NBCC 2020) tarioBuildingCode(OBC)du- km/h (68 mph) respectively.Roofing Systems (www.spri.org). of Canada. 87 Bakersfield St., Toronto, Ontario, M3J 1Z4 Tel: 416-787-0649 E X P E R T S F F O R YO U RE X P E R T S O R YO U RFax: 416-787-0640 Email: service@crawfordroofing.caE X P E R T S F O R YO U Rwww.crawfordroofing.ca B U I UIL I DI G G ENVELO P EB B L D I N N E N V E LO PEUILD NG ENVELOPEIndustrial Commercial Institutional Roofing SolutionsBUILT-UP ROOFINGBUILT-UP ROOFINGBUILT-UP ROOFINGBUILT-UP ROOFINGMODIFIED BITUMENMODIFIED BITUMENMODIFIED BITUMENMODIFIED BITUMENSINGLE-PLY MEMBRANESINGLE-PLY MEMBRANESINGLE-PLY MEMBRANESINGLE-PLY MEMBRANESUBGRADE MEMBRANESSUBGRADE MEMBRANESSUBGRADE MEMBRANESSUBGRADE MEMBRANESTRAFFIC COATINGTRAFFIC COATINGTRAFFIC COATINGTRAFFIC COATINGCOCNOENSETSOTGOAG RAO ROOFOINFIGN G CONESTOGA ROOFING COMMERAL I ,AL, DIN L, C UDSTURSITARLI,A -PMI Programs- Modified Bitumen- Built Up SystemsCOMMERCIIN A ROOFINGCONESTOGCO IN TITTUTIONAFL AT ROOFINGINS MERCIAL AL FLL AT STRIAL,GM TISTU ION , INDU ROOFIN-Metal Roof Systems- Waterproofing- Restoration INSTITUTIONAL FLAT ROO TRIAL, TF:TF:1-888-518-7663conestogaroofing.comCOMMERCIAL, INDUS FING-Emergency Services- Roof Anchors- Single PlyTF:1-888-518-7663 conestogaroofing.com1-888-518-7663conestogaroofing.comINSTITUTIONAL FLAT ROOFINGCONESTOGA WATERPROOFINGCONESTOGA WATERPROOFING-Roof Top Decks- Sheet Metal- Inverted(a division of Conestoga Roofing)TF:1-888-518-7663 conestogaroofing.com(a division of Conestoga Roofing)CONESTOGA WATERPROOFINGCOMMERCIAL, INDUSTRIAL COMMERCIAL, INDUSTRIAL (a division of Conestoga Roofing)ABOVE/BELOW GRADE WATERPROOFING ABOVE/BELOW GRADE WATERPROOFING COMMERCIAL, INDUSTRIAL CONESTOGA WATERPROOFING T:T:519-620-1515conestogawaterproofing.com519-620-1515conestogawaterproofing.comABOVE/BELOW GRADE WATERPROOFING (a division of Conestoga Roofing)T:519-620-1515conestogawaterproofing.com331 Sheldon Dr, Cambridge, ONN1T 1B1COMMERCIAL, INDUSTRIAL ABOVE/331 Sheldon Dr, Cambridge, ONN1T 1B1BELOW GRADE WATERPROOFING331 Sheldon Dr, Cambridge, ONN1T 1B1Committed to Safety, Quality & Service for over 37 yearsT:519-620-1515conestogawaterproofing.comServices Fully Bonded & Insured 331 Sheldon Dr, Cambridge, ONN1T 1B114ONTARIO ROOFING NEWSISSUE 4 2021/22 THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ORN'