b'Research New Roofing ResearchA recent technical roofing symposium showcases recent researchBy Mark S. GrahamThefollowingarticleoriginallyNorthAmericanandEuropeanOntario,presentedresultsfromlossesfromdesignR-valuesuptoapplicationvariablesandin-service appearedintheMarch2024issueroofing industries. Phase II of NRCCs Energy Ratingabout16%. board shrinkage.of Professional Roofing magazine.Thesymposiumconsistedofof Commercial Roofs research. ThePhaseIIresearchalsoana- Alsoanalyzedwastherole It is reprinted here with permissionpresentations of 11 peer-reviewed re- Phase I results were presented atlyzedtherolesinsulationboardthrough-fastenershaveonroofas-fromtheNationalRoofingsearch papers by 22 researchers. AnASTM Committee D08 on Roof- joints play in thermal losses in con- sembly thermal bridging. The study ContractorsAssociation. ingandWaterproofingspreviousfigurationsoftwo-layerinsulationinvestigated three common fastener overview of several of the presenta-O nDec.3,2023,ASTMtions follows. symposium held in December 2019.above roof decks. The average lossesdensities (four, six and 10 fasteners InternationalsCommitteeNRCA is a contributing supporterin effective R-value ranged from 2%per 4- by 4-foot boards) and three D08onRoofingandSome Highlights of NRCCs ERCR research. to7%for-of-an-inch-widegapsR-valuethicknesses(R-26,R-31 WaterproofingheldatechnicalIn Advancing the Thermal De- In ERCR Phase II, analysis high- and 4% to 9% for -of-an-inch-wideand R-36). The results show thermal symposiumaddressingroofinglighted the differences between us- gapsininsulationlayerthicknesslosses ranging from about 5% up to research and standards development.sign of Commercial Roofs: ImpactingconventionaldesignR-valuesranging from 2 inches to 9 inches.15% depending on the specific fas-ThesymposiumwasthetenthinofMeanOperatingTemperature,forthermalroofinsulationversusThe researchers indicated insulationtener density and insulation R-value.aseriesdatingtothemid-1980sThermal Bypass and Thermal Bridg- temperature-derivedR-values.InboardgapscanresultfromseveralTheresearchalsoanalyzedthe andprovidedinsightintocurrenting, researchers from the Nationalthetwoexamplespresented,thefactors,includingmanufacturingthermal bridging of several types of researchbeingconductedintheResearch Council Canada, Ottawa,lattermethodshowedestimatedtolerancesandboardsquareness,penetratingrooftop-mountedpho-18ONTARIO ROOFING NEWSISSUE 2 2024 THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ORN'