A laboratorymethodtosimulatenaturalexposureofroofing materialshasbeenreportedina companion article.Inthecurrentarticle,wedescribe theresultsofaninternational,nine-participant interlaboratorystudy(ILS)conductedinaccordancewithASTMStandardE691-09toestablishthe precisionandreproducibilityofthisprotocol.Theacceleratedsoilingandweatheringmethodwas appliedfourtimesbyeachlaboratorytoreplicatecouponsof12productsrepresentingawidevariety of roofing categories(single-plymembrane,factory-appliedcoating(onmetal),baremetal, fieldappliedcoating,asphaltshingle,modified-bitumen capsheet,claytile,andconcretetile).Partici- pantsreportedinitialandlaboratory-agedvaluesofsolarreflectanceandthermalemittance.Mea- suredsolarreflectanceswereconsistentwithinandacrosseightofthenineparticipatinglabora- tories.Measuredthermalemittancesreportedbysix participantsexhibitedcomparableconsistency. Forsolarreflectance,theacceleratedagingmethodisbothrepeatableandreproduciblewithinan acceptablerangeofstandarddeviations:therepeatabilitystandarddeviation sr rangedfrom0.008to 0.015(relativestandarddeviationof1.2–2.1%)andthereproducibilitystandarddeviation sR ranged from0.022to0.036(relativestandarddeviationof3.2–5.8%). TheILSconfirmedthattheaccelerated aging methodcanbereproducedbymultipleindependentlaboratorieswithacceptableprecision. This studysupportstheadoptionoftheacceleratedagingpracticetospeedtheevaluationand performance ratingofnewcoolroofing materials.
Soiling of building envelope surfaces and its effect on solar reflectance - Part III: Interlaboratory study of an accelerated aging method for roofing materials
MARTARELLI, MILENA;
2015-01-01
Abstract
A laboratorymethodtosimulatenaturalexposureofroofing materialshasbeenreportedina companion article.Inthecurrentarticle,wedescribe theresultsofaninternational,nine-participant interlaboratorystudy(ILS)conductedinaccordancewithASTMStandardE691-09toestablishthe precisionandreproducibilityofthisprotocol.Theacceleratedsoilingandweatheringmethodwas appliedfourtimesbyeachlaboratorytoreplicatecouponsof12productsrepresentingawidevariety of roofing categories(single-plymembrane,factory-appliedcoating(onmetal),baremetal, fieldappliedcoating,asphaltshingle,modified-bitumen capsheet,claytile,andconcretetile).Partici- pantsreportedinitialandlaboratory-agedvaluesofsolarreflectanceandthermalemittance.Mea- suredsolarreflectanceswereconsistentwithinandacrosseightofthenineparticipatinglabora- tories.Measuredthermalemittancesreportedbysix participantsexhibitedcomparableconsistency. Forsolarreflectance,theacceleratedagingmethodisbothrepeatableandreproduciblewithinan acceptablerangeofstandarddeviations:therepeatabilitystandarddeviation sr rangedfrom0.008to 0.015(relativestandarddeviationof1.2–2.1%)andthereproducibilitystandarddeviation sR ranged from0.022to0.036(relativestandarddeviationof3.2–5.8%). TheILSconfirmedthattheaccelerated aging methodcanbereproducedbymultipleindependentlaboratorieswithacceptableprecision. This studysupportstheadoptionoftheacceleratedagingpracticetospeedtheevaluationand performance ratingofnewcoolroofing materials.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
