b'Polyisocyanurate InsulationFigure 2SAMPLE # YEAR OF INSTALLATION SAMPLE THICKNESS, INCHES (MM) THERMAL RESISTANCE, R-VALUE PERASHRAE/NBCC CLIMATIC ZONETHICKNESS (RSI PER THICKNESS)3.016 (76.61)16.68 (2.94) 2.998 (76.14)16.54 (2.91) 1 1998 3.009 (76.43)16.71 (2.94)63.011 (76.48)16.77 (2.95)3.037 (77.15) 16.89 (2.97) 3.006 (76.34) 16.68 (2.94)2.563 (65.09)13.26 (2.34)2 2003 2.557 (64.94) 13.20 (2.32)72.536 (64.41) 13.05 (2.30)3 2006 3.400 (86.37)17.86 (3.15)63.413 (86.70) 17.38 (3.06)1.996 (50.70)10.41 (1.83) 4 1999 2.007 (50.99)10.45 (1.84)61.995 (50.68) 10.43 (1.84)5 Unknown 1.651 (41.94) 7.87 (1.39) 66 2000 2.001 (50.82)9.10 (1.60)62.038 (51.76) 9.47 (1.67)7 Unknown 2.669 (67.80) 14.43 (2.54) 58 Unknown 2.010 (51.05) 9.94 (1.75) 79 1991 1.498 (38.06) 7.65 (1.35) 610 1988 1.771 (44.99) 8.62 (1.52) 511 1992 2.835 (72.00) 17.18 (3.03) 7Figure 2: Thermal resistance of tested specimensOncethesampleswereob- R-Value Means of the Heat Flow Meter Ap- eachsample.TheR-valuesareblowing agent. Each manufacturer tainedfromthetestsites,theyR-value is determined by creat- paratus.Thespecimensizeusedgroupedbyclimaticzoneandhasadifferentformulation,and were not further conditioned ining a steady-state temperature dif- fortheheatflowmeterevalua- then presented in increasing or- eachblowingagenthasunique the laboratory because the objec- ference across the insulation thattion was either 12 by 12 inchesder of age, with the lowest age ofproperties that determine the per-tivewastoevaluatetheinsula- induces a unit heat flux. The R- or24by24inches.Followinginsulation on the left-hand sideformance of the insulation.tion in its current state. Test spec- values of the aged specimens werethe methods prescribed in ASTMandthehighestageofinsula- Furthermore,thethermalper-imenswerepreparedfromtheevaluated using a heat flow meterC1289, the specimens were testedtion on the right-hand side. Sev- formanceofpolyisocyanuratein-obtained samples and evaluatedaccording to ASTM C518, Stan- at mean temperatures of 40 F, 75eralsampleshadanunknownsulation varies as a function of age F and 110 F, with a temperatureage, denoted by N/A, and wereand temperature. The focus of the for R-value, compressive strengthdardTestMethodforSteady-Statedifferential of 40 F. thereforeplacedontheright- comparisonwasnottoidentify and flexural strength. ThermalTransmissionPropertiesbyAsamplesR-valuewasde- hand side. the manufacturers or the blowing terminedbyaveragingtheR- Notetheperformanceofagents of the samples, but to inves-valuesobtainedfromindividualpolyisocyanurate insulation var- tigatetheinsulationperformance specimen testing. The number ofies depending on several factors,as a generic component indepen-specimens evaluated varied basedincluding insulation brand, ma- dent of manufacturer details. ontheinsulationreceived.Theterial formulation, blowing agentThe effect of age on the ther-R-value was evaluated on the fulltype and facer type. mal performance of aged polyiso-thickness specimens, and the R- Blowing agents used by manu- cyanurate insulation was analyzed Commercial and Residential Roofing value per inch was calculated. Fig- facturers have been reformulatedto determine the changes that oc-ure 2 shows the measured thermalmultiple times as a result of envi- cur in-service over time.Trinity Roofing Ltd. specializes in a variety of roofing applications and resistanceofthefull-thicknessronmentalrestrictions.PreviousIn Figure 3, the measured data waterproofing for residential, commercial and institutional buildings. specimens tested at a mean tem- blowing agents included CFC-11showsSample#9,whichaged Phone: 416-630-9213URL: www.trinitycanada.comperature of 75 F. and HCFC-141B; however, sincefor 28 years, measured the lowest Fax: 416-630-1722 Email: info@trinitycanada.comFigure3showstheaverage2002,theindustryhasusedhy- thermal resistance (R-4 per inch) R-value per inch determined fordrocarbons such as pentane as thewhileSample#1,whichaged 12ONTARIO ROOFING NEWSISSUE 1 2020 THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ORN'