b'R CT & RU p d a t ei":I A- - O\\_ ,= - n,,i MRCA Technical and Research Committee Update on Activities and Long-Range Plans Since the update of the MRCAClass AInsulationof SBS modified bitumen. EPS Technical and ResearchThecommitteecontinuestoCoatingsusedforboth Committee article published inMid watch the activities of Underwrit smooth surfaced built-up and the westin the Spring of 1 ers Laboratories (UL) and its firemodifiedbitumenroof sysRoofer996, thefollowingwillupdatethetests on EPS board forratingstemsastocoverage,types fire fire MRCA members and others onusing the Modified White Houseused and Class Aratings the present activities of the com TestFacility andtheactivitiesby UL. mittee and its long-range plansinvolved with these tests by theFinalization of the report on involving research, field investi Polyisocyanurate Insulation Man thejoint MRCA/NRCA field gations and reports.ufacturersAssociation(PIMA)study on blistering problems and others. There are concerns onassociated with built-up roofEPDM Seam Systemsapproval of E boards as Classing membranes using perlite PS materia oards overnsLiaison continues with severalAl by some groups andcover b foam iuEPDMManufacturersontheindividualswellthe approvallations. asas shrinkage of the material. InbythemodelbuildingcodeInvestigating new single-ply addition to tests completed by Struc groups of the material as aproducts knownasTPresultO\'s eralizatturalResearch,Inc. (SRI)forof the tests by UL. This activity(new gen ion of ther MRCA, tests have been recentlywill be monitored closely by themoplastics) as to any probcompleted by one of the manufac committee.lems being encountered. turers. Theseresults andotherFurtherinvestigationson findingsontheshrinkageofOther areas of activities of theapplications,crackingand EPDMwillbereportedatthecommittee involve the following:splitting of fiberglass lamiMRCA Conventioner. - Granule retention, roll cover nated. in Novemb shinglesage,polymercontentandWorking w hMu al it Factorytuon use Sand Parting Agentquality and sidelap shrinkage(FM) and ULof MRCA The committee was presentedUplift Dome. FM has submitwith information regarding metricted field test results using the fiberglass felt used on adomeonhigh windsand recent job. Thereconcerns with thethese results are being wereevaluexcessive amounts of sand part ated by the committee. ingagent.Tests werethenRe-establish meetings ing conducted by SRI and fromwith FM and UL to coordinate the results, there does notth efforts and documents eir appear tobe any specificwith M . RCAproblems to be concerned - Continuedactivitieswith about.However,itwasASTMonalldocuments noted that higher shear testbeing worked upon. com ittee values were achieved with theThem has finalized an rolls using the sand partingoutline of long-ran plans for the ge agent and the lowest valuescommittee,whichwill include wereobtainedwithrollsfinalizationabove activities. of the using aparting agent.New projects, just to name a liquidfew, include: Continued on page 9'