b'or flashing as it is commonly foot traffic during curingbitumen sheet will stick down andDisadvantages of Self-adhered Modi- andspecificationswhenin-No referred to, depends in a largetimeAs the previous pointseal when the sun hits it and pres- fied Bitumen Roof Systems stalling self-adhered modified degreeontherateofmate- discussed, it is important forsure is applied using the manufac-W constraintseather/storagebitumen membranes.rialapplicationandambientthecold-appliedmodifiedturers specified weighted rollers. At the time of installation, weather conditions over time.bitumen roof system to fullyAdvantages of Self-adhered Modi- the air, product and substrate System adhesion increases ascure in order for it to reach itsfied Bitumen Roof Systems temperatures should be at orConclusionthe solvents evaporate. Oncefull system strength, thereforeThe advantages of self-adheredabovetheminimumappli-cold-processmaterialscure,trades or personnel access tomodifiedbitumensystemsarecationtemperaturerecom- The modified bitumen roofing thereisnochangeintheircompletedroofareasshouldsimilar to those for cold-appliedmended by the manufacturer.industryappearstobetrending properties. In theory, once abe restricted until the systemsystems,including:mitigatingWhilethetypicalminimumaway from torch-applied installa-materialcuresandthevola- has fully cured. potentialforfire-relatedinci- temperature range for applica- tion and to alternate installation tiles are out of the product, itdents; environmental, health andtion is 4-10 C (40-50 F), con-Self-adhered Modifiedsafety issues; ease of installation;sult the specific manufacturermethodssuchcold-appliedand forms a continuous layer thatBitumen Roof Systems reducedequipmentsetupandfor recommendations for ma- self-adhered. This shift is primar-does not change its propertiestakedowntime;easeofworkerterialstorageandhandlingily due to concerns over rooftop and should not wear out. As- Self-adheredmodifiedbitu-phalt, however, crystallizes overmen membrane sheets are com- training and constricted installa- duringcolderweatherappli- fires and increases in insurance re-time as oils dissipate and theprisedofasphalt,polymersandtion areas. cations. quirements and premiums. How- Cost efficientThere is the Primer may be a requirement. tackifiers, and may contain min- ever,thesematerials,although material becomes brittle, reduc- potentialforlaboursavings Clean/solidsubstrateforin-ing its waterproofing ability. Iferal stabilizers. The products may reducingthefirerisk,cannot properly formulated, a cold-ap- bereinforcedwithfiberglass,without the added complica- stallationSelf-adhered prod- beinstalledunderallCanadian polyester or a combination of thetions of torching, mopping oructsshouldonlybeapplied plied adhesive can achieve a sig- two. Products designed for expo- liquid adhesives.toanacceptablesubstrate,weatherconditions.Untilsuch nificant set of qualities over hotsure to the elements are typicallyasspecifiedbytheproducttime that manufacturers develop Less disruptionDue to no re-bitumen; however, this may besurfacedwithmineralgranules,quirements for kettles or torch- manufacturer.Thesubstratematerials that can be installed and an issue when trying to complycoatings,filmsorotheropaquees, installation of self-adheredmust be free of dust, dirt, oils,perform at lower colder tempera-with wind uplift requirementssurfacing. These sheets feature amembranesmaybelessdis- moisture or debris that could as these systems may not meetsticky backside of bitumen that isruptive to building occupants,interferewithproperadhe- tures, torch-down and hot asphalt the required wind uplift loadscovered in plastic. Upon removaland building operations couldsion. Always follow the manu- installation methods will remain until the system has fully cured. of the plastic layer, the modifiedcontinue uninterrupted. facturers written instructionsin the Canadian market.ORN THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ONTARIO ROOFING NEWSISSUE 1 202121'