b'MARS,PARSandIWRS.Thefastenerdensity(the number of fasteners per square foot or square metre) isWhile there are many tools for calculating the thermal calculated based on the user selection. AARS designs do not use fasteners; therefore, no input is required. For MARS and PARS designs, Energy-RCI requiresperformance of a roofing assembly, the Energy-RCI additional specific parameters relating to those system types. For PARS, the fastened layer is configurable, al-lowing the user to select either through one or throughapplication is the only tool that incorporates thermal multiple layers of insulation. The thermal bridging ef-fects of fastening through all layers and fastening onlybridging in the roof thermal design.the bottom layer differ considerably, so different cor-relationsareused.ForMARS,themembranesheet width, fastener spacing along the seam and the number of membrane seams per cover board or insulation boardProtective Roofing are all configurable and used to determine the proper fastener density.inStep 5: Thermal Calculation (Results) roof. The ap- Safety ProductsIn the final step, the application calculates the ther-mal performance of the users designed plication displays a tabulated summary of data collected the previous steps, a schematic of the cross section of the assembly design, the calculation for the R-value of the opaque assembly, the decrease in R-value accord-ing to any thermal bridging losses based on the fastenerBYdiameter and fastener density, and the final effective R-value of the roof assembly. Finally, the calculated effective R-value is converted to a U-factor and compared to the design U-factor pre-scribed by the energy codes. For example, suppose the roof design meets the code design U-factor. In that case, the calculator will indicate that the design is an accept-able design. However, if the design does not meet the code design U-factor, the calculator will provide the ad-ditional R-value required (fastener compensation loss) to meet the target design value.Case StudyTo illustrate the functionality and output of the En-ergy-RCI application, we present a simple case study.The PR 100 Guardrail SystemFor the time being, thermal bridging from parapet, pipes and curbs is not factored into the calculation but willis an efficient and practical perimeter guardrail that allows youlikely be incorporated in a future version of Energy-RCI. to work right to the edge of the roof.This case study considers the thermal bridging of fas-Meets and exceeds OSHA & WCB requirementsteners in a traditional MARS roof assembly for a build-Accommodates: parapets and cant stripsEasy to installing with a low-slope roof of standard construction. A commercial building in Boston, Mass. is proposed to be Provides unobstructed access to roof edgedesigned with MARS. The roof configuration comprises a steel deck, self-adhesive membrane as a vapour barrier, polyiso insulation, asphaltic core board and modified bituminous membrane. The fastener attachment for the cover board is 12 fasteners per board, and the mem-brane layout is designed with a fastener spacing of 12 in. (305 mm) on centre.Step 1The first step is to select between Imperial and metric units of measure for all inputs and outputs (Fig. 2). For this case study, the Imperial system will be used.Step 2 The PR 600 Mobile Fall Protection SystemIn the design criteria fields, the user begins by as- can be moved along the roof by pulling the cart to the desired working location, signingaprojectname.Thisnamecanidentifythe results if a user has multiple projects to examine. Forproviding a safe working area. The PR 600 meets O.S.H.A. compliance 1926.502D.example, for this case study, the project name is Case Study A (Fig. 3).Roofing & Sheet Metal Super Service CentresNext, the user identifies the building location and selects the relevant energy code (Fig. 3). The optionsEDMONTON, AB CALGARY, AB WINNIPEG, MB WESTON, ONare NECB 2015, 3ASHRAE 90.1-2016 1and ASHRAE(780) 432-2786 (403) 255-8236 (204) 338-7613 (Weston Road)90.1-2019. 2The case study uses ASHRAE 90.1-2019. (416) 745-4111Notethatwhenanenergycodeisselected,theBARRIE, ON HAMILTON, ON TORONTO, ONgeographical regions are reduced to those where that(705) 792-6683 (905) 560-2858 (416) 534-8421 WESTON, ONcode applies. For NECB 2015, 3the options for theOAKVILLE, ON PICKERING, ON LONDON, ON (Signet Drive)Province/State field are Canadian provinces, and for ASHRAE 90.1 2016 1or ASHRAE 90.1-2019, 2only(905) 825-0034 (905) 426-4443 (519) 668-3626 (416) 744-2050U.S. states are selectable. www.sparmarathon.caORN THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ONTARIO ROOFING NEWSISSUE 1 202223'