b'Symposium Research Paper TitlesEvaluation of Moisture Accumulation in Composite Roof Decks in High Humidity Environments suchCompressive Deformation of Hot-applied Rubberized Asphalt Waterproofingas Natatoriums in Cold Climates Using Hygrothermal Modeling A Case Study of the Assessment of a Tensile Membrane RoofCondensation in Cool RoofsCode Changes, Field Observations and Hygrothermal Modeling Lessons from Roof Refurbishment Projects in the UL and IrelandAdvancing the Thermal Design of Commercial Roofs: Impact of Mean Operating Temperature,New Research on Hail Damage to 55% Al-Zn Alloy-coated Steel RoofingThermal Bypass and Thermal BridgingThe Difficulties in Transitioning Control Layers from the Roof to Wall Final Report: Does Underlayment Matter?The Need for Dedicated Air Barriers within Low-slope Roofing Assemblies Performance of Aged Asphalt Shingles and Development of Climate-dependent Durability Indextovoltaic mounts and found ther- Index, other researchers from mal losses up to 50% dependingNRCC discussed development on the specific mount type andof a climate-dependent durabil-penetration frequency. ityindexforassessingasphalt The research concluded someshingle roof systems.roofassemblytypeswillexperi- Theinitialassessmentis enceseveralthermallossesandbasedontearstrength,fas-the overall effect on the roof as- tenerpull-throughandtensile semblysthermalperformance can besignificant. strength test methods specified In Compressive Deformationasapartofphysicalrequire-ofHot-appliedRubberizedAs- mentsforproductscomply-phaltWaterproofing,research- ingwithCSA123.5,Asphalt ers from Simpson, Gumpertz &Shingles Made from Glass Felt Heger Inc., Waltham, Mass., ana- andSurfacedwithMineral lyzed in-service performance andGranules, and ASTM D3462, laboratory testing of concentratedStandard Specification for As-load compression in hot-appliedphalt Shingles Made from Glass rubberizedasphaltwaterproof-ing used in plaza decks, terracesFeltandSurfacewithMineral andvegetativeroofs.ExamplesGranules.However,though ofconcentratedloadcompres- thetestmethodsonlyprovide sion include masonry veneer andfor testing asphalt shingle prod-precastconcretebearingpoints,ucts as manufactured, the re-wheel loads and undersized pav- searchers tested asphalt shingle erpedestals. productsaspurchased,after Theresearchshowedin-ser- laboratory conditioning and af-viceexamplesofloadcompres- ter field-aging.sions where hot-applied rubber-izedasphalthadcompressedtoAfter aging, most of the eval-negligiblethicknesses,raisinguated properties no longer met concernswhetherthehot-ap- theminimumrequirements pliedrubberizedasphaltwouldspecifiedinCSA123.5and remainwatertight. ASTM D3462. Some field-aged Althoughnorecognizedtestspecimensshowedareduction methodexistsforassessinghot- in tear strength more than 50%.applied rubberized asphalts com- Based on this limited data, a pressive resistance, the researchersframework for a climate-depen-developed an in-house laboratory assessmentmethodthatshoweddentdurabilityindexisbeing goodcorrelationwithvariousdevelopedandadditionaltest-fieldconditionsandthehot- ing will be carried out.applied rubberized asphalt types they observed. Published ProceedingsTheresearchalsoofferedASTMInternationalhas possiblesolutionstomitigatepublishedthesymposiums hot-applied rubberized asphaltsproceedings as Selected Techni-compressive deformation. These include reducing or eliminatingcal Papers 1650, Roofing Re-concentratedloads,increasingsearch and Standards Develop-theareasofload-bearingsur- ment: 10th Volume.faces,andsupportingspecificIfyouareinterestedinad-concentratedloadsonelevatedditional information about the supportsandpossiblyusingaresearchhighlightedhereor harderwaterproofingmaterial,other research papers presented, suchasPMMA(polymethylIencourageyoutopurchase methacrylate) to flash these el- thesymposiumproceedings evated supports.In Performance of Aged As- atastm.org.phalt Shingles and DevelopmentMark S. Graham is NRCAs of Climate-dependent Durabilityvice president of technical services.ORN THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ONTARIO ROOFING NEWSISSUE 2 202419'