b'Technical Article and cold-weather shock componentDevelopingascience-basedindica-temperaturesandtheirrespectivetor that would combine key proper-limited to, reroofing, resurfacing, recovering, limited to, reroofing, resurfacing, recovering, numberofoccurrencesaredeter- ties with the exposed climate severity and upgrading for energy efficiency and highmay provide a more mined. Also,ding for energ cyclingof the material and upgra to replicate they efficiency and high windevents. occurswithcomprehensive indicator of the ma-thatalreadynaturally windevents.Unfortunately, as a roofing communitlong-term the change in seasons, the hot- andterialsy,performance. The co Unfortunately, as a roofing commu nity,developed to accomplish ld-weather shocks were alternated.CDDI was there is no consensus in the terminology. there is no consensus in the terminology. Animportantstepforincorporat- this. The CDDI combines five criti-Moreover, existi ng limited code specifications Moreover, exist ing limited code specifications ingtheweathershockframework cal properties: tear strength, overlap limited to, re are misunderstood due to variations in the roofing, resurfacing, recovering,strength, fastener pull-through, ten-intotestingisthedurationofthe are misunderstood due to variations in the and upgrading f r and ergy efficiency ensure prac- sile strength and granule loss.hotmi ncold cycles toand high te or e nology at various levels. The NRC is terminology at various levels. The NRC is ticalityoftheexperiments.Anex-windevents. For each of these properties, the undertaking a nationwide consultation process undertaking a nationwide consultation processandimportance ample of how this can be achieved Unfortunately, as a roofing commu nity,durabilityfactor to gather the state of the current design practice. to gather the state of the current design practice. is by setting a practical duration of there is no consensus in the terminology.factor are calculated. The durability One of the main objectives of this consultation the entire weather shock cycle and One of the main objectives of this consultation Moreover, existi ng limited code specificationsfactor depends on the propertys re-adjusting the duration of each cycle. is to develop building code requirements. Bothafter exposure to is to dev to vabuions in theduction in strength are misunderstood dueelop riatilding code requirements. Both This must be achieved while ensur-current cli matic and future climatic conditions ingthatthetotalnumberthe climate zone-dependent weather terminology at various levels. The NRC isoffluc-current cli matic and future climatic conditions will ionconside ultation ram essshock protocol. If a property is great-undertaking a natbe wide cons red. A fproc ework is presented in will be considered. A framework is presented in tuationsforhot-andcold-weather to gather the state of the current design practice.ly reduced, that is an indication that Fig. 30. maintained.Anexamplethe durability of the shingle is low. shocksis Fig. 30. olouredroofcovering One of the main adark-c s of this consultation of objective Thedurabilityfactorrangesfrom (asp lding code requirements. Both is to develop bui halt shingle) is shown in Fig. 29. Q25: AS A ROOFINGzero to three. A durability factor of Thehot-andcold-weatherING Q25: AS A ROOF shock current climatic and future climatic conditions Figure 27. Typical components of Asphalt Shingle Roofing (ASR). COMMUNITY, HOW CAN WEtoreductionin zerocorresponds Figure 27. Typical components of Asphalt Shingle Roofing (ASR). will be considered. A f a total duration of 15 days.AN WEthan45percent, cycle hasramework is presented instrengthgreater COMMUNITY, HOW CWithin each day there are eight hot- Figure 27. Typical components of Asphalt Shingle Roofing (ASR). PLACE THE BUILDING OWNER Fig. 30. PLACE THE BUILDING OWNER andsixcold-weathershockcycles.and a durability factor of three cor-IN THE SWEET SPOT? toreductioninstrength The duration of 15 days, along withresponds IN THE SWEET SPOT?A holistic approach is proposed so that thee per cent. A higher dura-Q25: AS A ROOFINGless than fivA holistic approach is proposed so that the the breakdown of eight hot and six Figure 27. Typical components of Asphalt Shingle Roofing (ASR). COMMUNITY, HOW CAN WEbility value indicates a more durable building owners enjoy the sweet spot. Basically, cold cycles a day and the duration building owners enjoy the sweet spot. Basically,factoris PLACE THE BUILDING OWNERshingle.Theimportance therecold and hot cycle,ents that need to be of eachare three requirem can be there are three requirements that need to beof the five critical IN THE SWEET SPOT? assigned to each changed to better reflect the building collectively integrated, including:collectively integrated, including: properties based on the mode of field A holistic approach is proposed so that the envelopematerialbeingevaluated. Load specification accounting for futureindustry consensus. The building owners Load specificati pot. Bas unting for future enjoy the sweet s on acco ically,failures and An asphalt shingle will not absorb andclimatic conditions mannerimportancefactorforeachprop-there are three requirements tha similar retain heat in at need to be climatic conditions grated, including: erty is greater than zero but less than collectively inte beige wall siding. Therefore, the testing to aResistance evaluation throughf Resistance evaluation through testingtear = 0.2; overlap actors that must be respected whenone, as follows: Load specification accounting for future incorporating the climatic load strength = 0.3; fastener pull-through incorporating the climatic loaddetermining the composition of the climatic conditionsInstallation with quality assurance metricsInstallation with quality assurance metricscycles are: = 0.2; tensile = 0.1; and granule loss Resistance evaluation through testing The cold and hot component= 0.2. By combining the durabilityincorporating the climatic loadweather shock temperatures factorhree Figure 31 illustrates that when the t and the importance factor for Figure 31 illustrates that when the threecriticalproperties,one Installation with quality assurance metrics eachoftheThenumberofweather r qu can determine the classification level re uiirreemmeennttssaarreeccoommbbiinneedd,,tthheenntthheesswweeeettssppootteq shockoccurrencesis achieved. TThe sswweet sspotiinnddiiccaatteesstthheesshhaarreeddFigure 31 illustrates that when the threeof CDDI, which can be either silver is achieved.heeetpotrequirements ar3 mmbi ofd, tadn tesisweece,a t diinnssttaallllaattiioon. Then. Thetwoandless Q2e : Can e l Clie,r he sta nt spon (CDDIgreaterthan segcoentnaohm r te- a nce, andasegment of load, esistis achieved. The sweet spot indicates the sharedthan three) or gold (CDDI = 3).Dependent sweetspot segment, the longer the biggerth e Durability Indexe longer the bigger t h e sweet spot segment, thsegment of load, resistance, and installation. The (CDDI) Bfe off r oofin g as forblliieessserv ce li e Der eloned semserviice l ife o v p s semboofi g abigger the sweet-spot segment, the longer theQ24: What Is the Roofing Components?service life of roofing assemblies. Immediate Need for By taking asphalt shingles, for ex-CLLOOSSIINNGGRREEMMAARRKC KSSample, the CDDI can be explainedCommercial Roofing?Thiis paperrpprreesseenntteeddsseelleecctteeddaaccccoommpplliisshhmmeennttss existingroofs Th s pape Alterationsto CLOSING REMARKSas follows. Shingle composition and This paper presen he ongoin g r compl g connsor (AER)haveamajormarketshare of th d selected ac oofiin ishments tof t te aren g roof ng co s ortiiaaaatttthheeNNRRCCTThheee ongoi complex, and attrib-behaviour of the ongoing roofing consortia at the NRC. Thecomparedtonewconstruction.In Q f orrmmatthhaass bbeeenn uusseddttooaddddrreesssstthheewwideide Q&&AA fo a e e autingperformanceonceinstalled Q&A format has been used to address the widesomeregionsofNorthAmerica, as part of a system to an individual rangee t opiiccssOOve rtth quate.a ost of rango top v e r heellaasstt2200yyeearrss, m, most of offdifficult and inaderange of topics. Over the last 20 years, most ofAERmarketshareisover70per property is t cent. AERt tthee but is not lim-th hheesseeddeevveellooppmmeennttsshhaavveebbeeeennpprreesseenntteeddaat Figure 28. Weather shock framework. these developments have been presented at theincludes, eatherannuaallIIIIBBEECCccoonnvveennttiioonnss,,ffoorrwwhhiicchhtthheeaauutthhoorriissFigure 28.Weather sshhoocckk f frraammeewwoorrkk annu ited to, reroofing, resurfacing, recov-Figure 28.WWeather shock framework. annual IIBEC conventions, for which the author is Figure 28. ering and upgrading for energy effi-ciency and high wind events.Unfortunately, as a roofing com-munity,thereisnoconsensusin the terminology. Moreover, existing limited code specifications are mis-understood due to variations in the terminologyatvariouslevels.The NRCisundertakinganationwide consultationprocesstogatherthe state of the current design practice. One of the main objectives of this consultation is to develop building code requirements. Both current cli-matic and future climatic conditions Figure 29. Example of the application of the hot- and cold-weather shock for a dark-colored roof covering. will be considered. A framework is Figure 29. Example of the application of the hot- and cold-weather shock for a dark-colored roof covering. presented in Fig. 30.Figure 29.InterfaceJanuary 2025Figure 29.E Exxaammpplele o off t thhee a apppplliiccaattiioonnoofftthheehhoottaannddccoollddwweather shock for a dark-colored roof covering.eather shock for a dark-colored roof covering.20IIBEC 22ONTARIO ROOFING NEWSISSUE 1 2025 THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ORN20January 20 IIBEC IIBEC Interface InterfaceJanuary 20252025'