b'Modern construction practices and increased building code demands have transformed substantially since the 1980s, primarily to provide a better environmental separation Art Meets Science:between the interior and exterior climates, improve interior comfort and reduce energy costs.Roof replacements Protective Roofing Safety ProductsBYCold process modified bitumen membrane built-up roof installation. (Credit: Chris Dawson.) 2 x 4 Wood Rails 8 Aluminum RailsThe PR 100 Guardrail System thought of using roof assembliesChallenges with Earlyis an efficient and practical perimeter guardrail that allows youfor anything butwaterproofing. Insulated Roof Systems to work right to the edge of the roof.Modernconstructionprac- Earlyversionsofinsulated Meets and exceeds OSHA & OHSA requirementsticesandincreasedbuildingroofsystemsbroughtnewis-Accommodates: parapets and cant strips code demands have transformedsues, including vapour drive and Provides unobstructed access to roof edgeEasy to installsubstantiallysincethe1980s,thermal bridging, which resulted primarily to provide a better en- inuncontrolleddeterioration vironmental separation betweenandprematurefailuresofroofs the interior and exterior climates,to provide the desired improved improveinteriorcomfortandprotection. The moisture-related reduceenergycosts.Therearedeterioration included reduction nolongerumbrella-typecoversin anticipated thermal resistance onbuildingsinstead,imper- values,mysteryleaks,emulsify-meablesolutionsthatattempting adhesives, corrosion of met-als and mould issues. MembraneThe PR 600 Mobile Fall Protection System to control or eliminate thermal,technology also changed as new moisture and airflow migration.membrane types were developedcan be moved along the roof by pulling the cart to the desired working location,Early attempts with what seemedtoimproveperformanceandproviding a safe working area. The PR 600 meets O.S.H.A. compliance 1926.502D.toberevolutionarymaterials,(hopefully) provide reliability in includingnewmembranesand insulationsdesignedtoprovideaninsulatedroofsystem.RoofRoofing & Sheet Metal Super Service Centresimprovedroofperformance,membrane system types included brought mixed results. As an in- single-andmulti-plyassembliesEDMONTON, AB CALGARY, AB WINNIPEG, MB WESTON, ONdustry, roofers and designers alikeincorporated in built-up (mem- (780) 432-2786 (403) 255-8236 (204) 338-7613 (Weston Road)experienced roof system failures,brane over insulation) or invertedBARRIE, ON HAMILTON, ON TORONTO, ON (416) 745-4111(membraneunderinsulation) often due to a lack of understand- formats.Theunfortunatepart(705) 792-6683 (905) 560-2858 (416) 534-8421 WESTON, ONing regarding how to install theof the new membrane and insu- OAKVILLE, ON PICKERING, ON LONDON, ON (Signet Drive)roof with the new products andlationtrendwasthattheroof- (905) 825-0034 (905) 426-4443 (519) 668-3626 (416) 744-2050not knowing how to apply build- ing industry was unsure how to ing science principles to roofinginstallanddetailthenewroofwww.sparmarathon.cadesign and installations.assemblies.Roofingcontractors ORN THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ONTARIO ROOFING NEWSISSUE 2 202515'