b"onOrganicFelts~ofnotfelt built-up roofing usage tables recognition as other approved roofing products. IllThe organic awillbe included in the 1996 printing of the ,FMRC Approval Guide. Approval for propri oretary insulations, or roof assemblies will also be affected by the change. ,Tomaintain approval with organic felts,be11 LU VV FMRC is to be supplied with product trade c:, '-' the .:5names and the manufacturer's name for - ccganic felt that the manufacturer wishes to c:, ClO - included in this category. Upon receipt of this cc C INUED ON PAGE ONTIIn a recent release from the Factory MutualBobismsANXIOUS TO IMPROVE Research Corporation CFMRC), it advised thatMANY MEN AREMORETHEIRCHARACTER. FMRC intends to discontinue generic approval ofin built-up roofing assembliesTHEIR APPEARANCE THAN organic felt that are constructed with nonapproved felts. It is the intention of FMRC to bring organic felts,THEMAN WITHBURNING AMBITIONISSELDOM which are not currently approved by FMRC,FIRED. but desire to be approved, up to the same level Q.How does weather affect a roof?For example, in cold temperA.Weather dictates the roofing industry likeatures, roofing materials steep, a no other trade. Low-sloped orroofshould not be applied receives the full blunt ofweather. Overfor a built-up roof unthe the course ofa roof will, or may, en less correct bitumen a year, dure the scorching heat of summer and theapplication temperacold blasts ofIt may also have totures can be maintained. winter. gale shed torrential rains, resist winds ofAlso, high winds can blow force. stand up to hail andand scatter hot materisupport a blanket ofals, and cause spraysBY BoeCAE snow.LACOSSE, Also, the destructiveof cold materials and forces ofcoatings to become airborne. Precipitation, no freezing and thawing cycles and at matter what kind, prevents proper applications tacks by fire, salt air, acidof roofing materials. traffic, abuse fumes, foot and vandalism may fur Q.What is meant by selvage and selvage joint ther tests its qualities.on a roll of felt? Because ofA.Selvage is the edge or edging that differs this, each roof system is de-signed to meet conditions not only offrom the main part ofor granule-sursub a fabric strates, life span, and roof slope, but offaced roll roofing material. The selvage joint is a elements and geography as well. Climatelapped joint designed for mineral-surfaced cap and geography determine the type of roofsheets. The mineral surfacing is omitted over a membrane that will be installed.small portion of the longitudinal edge of the The roofing contractor should pay con sheet below in order to obtain better adhesion stant attention to weather changes and followof the lapped cap sheet surface with the bitumistrict guidelines for the applications of the roof nous adhesive. ing materials during various weather conditions. MR October 957"