b'~ - - - - -? -Questions fromMRCA Members By Bobo CAE Lac sse, As a follow-uptomy articleWith regardclimates,critical.performance characteristobased th appear in the April 1999uponlong use in the field, thetic in relation to the feelof the ated issue of Midwestw horganic shingle has alifeshingles in handling by the roofRooferit titlelonger "MRCA Technical Advice Helpsspanincoldclimatesandining applicator during application. Members Succeed," I11answerareaswherethereisextremeIt is also critical in determining wi thefollowingfromoneof thetemperaturechanges,whereastheresistanceofshinglesto MRCA members:the time-tested fiberglass shingleblow-off.However, tear strength edwarmer is preferr in hot orcli resistance alone does not deterQuestion: What is the differ mates.Thesepreferences aremine the completeformance perence in the manufacturing betweenbased on theI,of the shingle.Also important in hand ing stiffness, fiberglassand organicasphaltflexibility, and weight of the shin fiberglass shingles ishave the to shingles and in what climates dogles,as wellas their ability tonecessarymatweightandthe the asphalt fiberglass and asphaltwithstand hot sunrays.most acceptable amo of. untfillersorganic shingles perform best?In thesamearea,another member"How important asked, A er: F lass shinglesis the tear strength inperfornsw iberg the have glass mats thatare filledmance of an asphalt shingle?" withand mineral fillers.In response, tear strength in asphalt Organic shin on the otherthe shingle isbecause gles,important hand, have asphalt saturated feltitmeasurestheresistanceof as the base.The organicsplitting and tearing of the shinshinglesaremanufacturedwithagle as a result of movements by larger amount ofp and havebuilding expansion and contracas halt alper squaretion,fasteners,load andwind. greater tota weight than the fiberglass shingle.Further,tear resistance is a the Setting the RecordaughtjlfflfiUTCJlb StrContinued from page 4 their busin not because esses,of any form of coercion.ARCllC1T al~t,/Jt~ ll1 .The FM 4490 issue is a prime example of atleast oneof the-~~~ benefits of membershipinthe MRCA.T MRCA has alwaysSHEETMETAL,INC. he endeavored to be aadvostrong cate tor the roofing con rs tractowhose dues supportassociathisProviding Sheet Metal for the Roofing Industry he tion. T unified voice of many lendspowerfusupport tothe ISeamless 7" Box Gutter45 Downspout individual, and imparts the abil x ity to affect positive change in this business,whichleadsto improvements in the industry. 1 48\'1 [708) 756-4890OFFICE[708) 756-4892FAX 1'