b'PMRAPhoto credit: Jeff Baker, Rimkus Consulting. (Project by Flynn Canada Ltd., Kelowna.)HOLISTIC ASSESSMENT OF PROTECTED MEMBRANE ROOF ASSEMBLIES IN SUPPORT OF CODIFICATIONPart 1 BY SUDHAKAR MOLLETI (SUDHA), PH.D., TEAM LEADER, ROOFING SYSTEMS AND INSULATION CONSTRUCTION RESEARCH CENTER, NATIONAL RESEARCH COUNCIL CANADAP rotectedmembraneroofThisinvertedlayoutshieldsthePMRAs often support green roofs, blue assemblies(PMRAs),alsomembrane from UV radiation, tempera- roofs and other stormwater management knownasinvertedroofturecycling,mechanicaldamageandtechnologies, making them ideal for urban systems,areonegenreofenvironmentalwear,whichdegradeconstruction that must meet current envi-low-slopedcommercialroofs.PMRAsroof performance. PMRAs have longerronmental and energy standards.place the waterproof membrane directlyservicelivesandrequirelessmainte- Despitetheirestablishedresilience over the roof deck and protect it withnance,improvinglifecycleperformanceand growing adoption in North America insulation and ballast (Figure 1), unlikeandsustainability.Greeninfrastructureand Europe, PMRAs still encounter chal-conventional roofs. compatibility is another PMRA benefit.lengesregardingstandardizedcodifica-Mack KirkMack Kirk RoofingIndustries Ltd.& Sheet Metal Ltd.Between the world and the Between the world andweather since 1908the weather since 1908100 -1485 Coast Meridian, 9552 198 St.Port Coquitlam B.C. V3C 5P1Langley, BCV1M 3C8Office: 604.258.7121 Office: 604.258.7121Fax: 604.258.7122Fax: 604.258.7122 info@mackkirkroofing.com info@mackkirk.com ACCEPTED OBSERVATION FIRM www.mackkirkroofing.comwww.mackkirk.com16 lROOFINGBClFALL 2025'