b'(44 ft.), with a minimum four- Continuity ofin-situtestingoftheroofassemblyassembly. However, when a buildingavoidduplicationinsomeprojects per-cent slope towards the drain. InWaterproofing,for wind uplift, leak detection systemenvelope consultant with expertise inand thus lower the costs of Gold and the Silver and Gold classifications,Airtightness and Weatherfor rain penetration and flood testingroofing is involved in the project, theSilverprojects.everydrainisrequiredtohaveaResistance of penetration flashings to either sub- intent of this requirement can be metInadditiontotheconstruction corrosion-resistantmetalstrainer5 stitute for or reduce the 100 per centwithoutengaginganindependentreviewsasmandatedbytheCSA that is compatible with the adjacentThe CSA A123.26roof per- inspectionrequirement.Thesealter- quality assurance inspector. If the re- A123.26, 5 itisrecommendedto materials and secured in place, andformancerequirementsforthenatives are discussed in later sections. quirement were modified to include aconductthefollowing:reviewof there must be drain screens securedSilver and Gold categories speci- CSAA123.26 5 requirementsforreview by the already involved build- projectspecifications(including to the drain strainers in a minimumfy that roof membranes, flashingquality assurance inspections conveying envelope consultant with expertiseproject-specificwindupliftloads); of four locations to catch roof de- systems and other roof penetra-bris. These screens must be at leasttions must be designed to be wa- the criticality of construction reviewsin roofing as an alternative to a qual- shop drawings and submittals; wind 609 mm (24 in.) in diameter andtertight and comply with CAN/ for a proper installation of the roofityassuranceinspector,thatwoulduplift resistance report from the third-madefromacorrosion-resistantULC-S742,StandardforAir materialthatiscompatiblewithBarrierMaterialsSpecifica-the adjacent materials. The screention. 17These requirements align must be installed with a zinc stripwithcurrentindustrypractices tominimizetheunintentionalfor waterproofing and air barri-growth ofvegetation.ers in roof assemblies.In alignment with the currentInaddition,CSAA123.26 5industry practice to install second- includesrequirementstoen-arydrainageforeveryroofarea,hancetheweatherresistance CSAA123.26 5 includesrequire- ofroofassembliesbylimiting ment to install secondary drains orthe impacts of snow accumula-scuppers to manage the overflow oftion, wind-driven rain and water rainwater in case of drain failures.splashing off the roof membrane The standard requires a minimumsurface.Thecurrentcommon scupperopeningheightof102industrypracticeisfora203-mm (4 in.) for roofing assembliesmm(8-in.)membraneupturn in the Silver classification and 152atroofpenetrationsandopen-mm (6 in.) for those in the Goldings,includingskylights,fire classification,anditprescribeswalls, roof curbs, transitions and that a scupper must be installed achanges in plane in the interior fieldoftheroof.Accordingto minimum of 51 mm (2 in.) aboveCSAA123.26, 5 roofassemblies thefinishedroofsurfacewithin the Silver category must have proper flashing detail and locatedan upturn of 355 mm (14 in.) at the lowest point of roof or roofand those in the Gold category perimeter. The standard also pre- musthavea457-mm(18-in.) scribes that the width of a scupperupturn. The membrane upturn opening must not be less than therequirement on an exterior wall circumference of the roof drain inassemblywithinthefieldofa the same roof area. However, uponroofassemblymayposechal-evaluation, it was noted that a re- lenges when the insulation is po-quirement to install scuppers withsitionedwithinstudcavities.It a width equal to the circumferencecould create a situation in which of the main drains is excessive. Forvapour retarder is doubled in the instance,thecircumferenceofawallassembly.Theupturnfor 76-mm(3-in.)-diameterdrainisthemembraneflashingatthe greater than 228 mm (9 in.) and theparapets is required to be at 304 circumference of a 101-mm (4-in.)- mm (12 in.).diameter drain is greater than 305 mm (12 in.). This requirement isInspection RequirementscurrentlybeingreviewedbytheThewindandrainsections SIGDERScommitteeformodifi- ofCSAA123.26 5 bothspecify cation; in future editions of CSAthe need for independent inspec-A123.26, 5 therequirementmaytorstoconductqualityassur-specify that scuppers must have theance observations. For the Silver same diameter as the main drainscategory,therequirementisto or a diameter equal to the height ofretain an independent inspector the scupper.for at least 25 per cent of the days Regardingtherainwaterdis- of work during major stages of charge onto grade, CSA A123.26 5 the roofing application, includ-calls for the termination of drain- ing completion. The intent is for pipe 457 mm (18 in.) above gradethe inspector to review whether withanelbowextensionof914the work conforms to the stan-mm (3 ft.) from the building ontodard, to the applicable governing splashpadsattheoutletand/ building code and to any qual-orcounter-flashingsonthewall.ity assurance metrics established While this arrangement is a com- by the design specifications. For mon industry practice, the require- theGoldcategory,therequire-ment in the standard reinforces thement is to retain an independent significanceofkeepingthewaterinspector for 100 per cent of the away from the building as it is be- days of work. CSA A123.26 5of-ing discharged. fersalternativeoptionssuchas ORN THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ONTARIO ROOFING NEWSISSUE 3 202521'