b'Technical& ResearchCommittee UPDATEONACTIVITIESANDPROJECTS The following will update the MRCA mem Low-slope retrofit questions and concerns. bers and others on the present activities andeworkingwith Factory Mutual and Under projects of the MRCA Technical and Researchwriters Laboratories on coordination with Committee and will supplement some ofuse of the MRCA Uplift Dome. the reports presented at the 1995 MRCA Conven eMRCA/NRCAModified Bitumen Task tion.Force now has the final draft of the field investigation and the report should go to EPDM TAPESEAMSYSTEMSprint shortly. Tests on EPDM tape seams were reported atThe committee also has representation on the October 1995 convention that were per ASTM Committee DOS and E06 to see that formed at the laboratory ofMRCA and roofing industry concerns are dealt Structural Research, Inc. CSRD. High-heat-creep tests arewith. currently in the process at SRI, and results ofAs indicated in my previous committee upthese tests should be reported in the next fewdate, the committee welcomes any reports months.sent to the MRCA office from the members on any problem involving roofing materials, and/or BY BOBLACOSSE,CAESAMPLINGANDTESTINGOFSBS MODIFIEDroofing systems, so they can be investigated by BITUMENSthe committee for possible solutions. Questions were raised in the Fall of 1995 on some SBS modified bitumen products having problems regarding granule adherence, roll coverage, polymer content and quality, sidelap shrinkage and polyester quality. SRI has proceeded with sampling and testing. From the preliminary report on this item at the convention, cooperation has been obtained from a number ofis proceeding to manufacturers. SRI re-test the same line of SBS modifieds for cold flex and granule retention. Some APP granule products will also be tested to compliment the SBS products. (LASSAEPSINSULATION The committee is investigating the issue of metal deck corrosion caused by the coating additives to render the system fire rated by U.L. Manufacturers will be contacted for samples and sheets to evaluate at SRI. OTHER AREASOFACTIVITIESOFTHECOMMITTEE: Coatings used for both smooth built-up and modified bitumen roof systems. eMRCA/NRCA/FactoryMutual Joint Liaison Committee to discuss and resolve mutualissues. MR April 965'