b'resident\'sArticle Polyisocyanurate Insulation and the Roofing Contractor ByMRCA President Dave Ti/sen, Duringlast couple of m Roofingcontr rsrequirep isoc n tein lationintheonthsacto oly ya ura su to the roofing contracting communitymaterials such as polyiso any p edf system installacyanurateropos rooformation hasbeenreceivingin be manufactured to meet the high tion. about issu relating to polyisocya est standards of quality, be readilyAs polyisocyanu eofulaesrat ro insnurateroofinsulation.Mostavailable, and performin con tion manufacturers are faced with well recently, the Nationalcert with the other roofem com switching blowing agents to meet Roofing Con systtractors Association (NRCA) issuedponents. Weascontractorscanerwiron lregula on, weas menta ti"Bulletin 2000-3" and \'\'Attachmentonly assume thatbecauseofthecon ,faced with the postractors are "bother ofmat ria tha has to Technical Bulletin 2000-3,problemsmentionedabove, th esibilityreceivinge lt dated March 2000 (copies of whichisdeficiency in the manu c n been th ly te d in the somefa otorough steare printed in th issue). Accordingturing process or the product sim field.Somema acturers hisnuf ave to NRCA, polyisocyanur insula plycannot p aswehavealready m ch in the proateerformadeanges Roofing contractorstion represents aportioncome toduction process whileers hsignificantexpect.oth ave of the in used inyet to begin. I su erequire materialssulationgg st low-slope roof systems.thaty questionthe ou such asMarket survey data gath manufactur you uersse ered by the NRCA claimsas to where theyin are upolyisocyanuratepolyisocyanuratehasathe p for, what their rocessbe manufacturedmarket share of approxi timelineconversion matelypercent.is, whente p du55stro ct to meet the highestThereisnoquestionwillbeavailable,and quality,that polyisocyan te isinsurastandards ofhow thetalling conperformingwellinthetractorll be informed wibe readily available,majority of installations.ofatpe of blowing wh tyHowever,tractors areagentbeing used. and perform well incon is reportingproblemsandThe MRCA will be concert with theit is the role of MRCA tofollowingtheissues investigatereportwithp yisocyanuother roofandonol rate systemsuch issues.roofinsulationvery components.Inmyopinionthereclosely in the months are two key issues con- ahead. As you read this tractors facein the selectionandInyour reviewofthe" article,theMRCATechnicaland NRCA u of polyisocyanurate.T firstBulletin"will findrecom Research Committeehave seheyouthewilljust tocovermereetiissue is of problems relatingin mendation for the useof aconcludeditssum m ng. serviceperformanceincluding:board over polyisocyan insu Youexpect additional in mauratecanforfacer-sheetdelamination,edgelationin alllow-slopemembranetion- for nowquesvery soon ask cavitation,cuppingorbowing,roofsystemapplication T tionsc ion. s.heand useautshrinkage, crush or powdering.MRCATechnicalandResearch ing T items are described inCommitteeiscurrently reviewing hesemore detail in the"NRCA Bulletin." Thethe"NRCA Bulletin"will soon and second issue is of an approachingissuecommentsand/orrecomsunset d by which manufactu mendations to our membership. I aterers of polyisocyanurate insulationu allc to o building rgecontra torsffer must switchareronmen o general contractors,and tomo enviwners, f commun the tally-friendly blowing agent or pro the designityoption of duction.incorporatinga coverboard over'