b'TECHNICAL UPDATEANNEX 1 ANNEX 2MARS: Shortage in fasteners created the need to qualify PARS: Extend the rating of a tested specimen to an altered specimen alternate sources. with an altered thermal barrier.Tested Specimen Cap SheetSource 1Heat-welded to the base sheet Tested Specimen Base SheetSource 1 Cap SheetSource 3Mechanically attached in lap, using fasteners (#14 screws and 51 mmHeat-welded to the base sheet [2"] round barbed plates), spaced 305 mm (12") o.c. Base SheetSource 3 Laminated panelInsulationSource 1 polyiso Adhered to insulation using adhesive (ribbons spaced 305 mm [12"] o.c.) Mechanically attached using fasteners (#12 screws and 76 mm [3"]InsulationSource 3 Polyiso round plates), 6 fasteners per 1.2 m x 2.4 m (4\' x 8\') boardAdhered to vapour barrier using adhesiveVapour BarrierSource 1 (ribbons spaced 305 mm [12"] o.c.)Self-adhered to steel deck Vapour BarrierSource 3Steel Deck (0.75 mm [22 ga]) Heat-welded over thermal barrier primed with Source 3 PrimerThermal BarrierSource 3Sustained pressure: -4.5 kPa [94 psf] (unfactored) Mechanically attached using fasteners (#12 screws and 76 mm [3"]Tested component: Base sheet fasteners (screws & plates) (Source 1)round plates), 16 fasteners per 1.2 m x 2.4 m (4\' x 8\') boardAltered component: Base sheet fasteners (screws & plates) (Source 2) Steel Deck (0.75 mm [22 ga])Small-scale tests performed to evaluate the equivalency: 1.Pullout resistance of fasteners from steel deck (ANSI/SPRI FX-1)Altered component: 1646 N (370 lbf) Tested component: 1401 N (315 lbf)Sustained pressure: -5.4 kPa [1139 psf] (unfactored)2.Pull-through resistance of base sheet/fastener combination (ANSI/SPRI MPO-1)Tested component: Source 3Altered component: 2547 N (573 lbf) Tested component: 2177 N (489 lbf)Altered component: Source 4Conclusion: Specimen with altered component is assigned the same rating {-4.5 kPaSmall-scale tests performed to evaluate the equivalency: (94 psf)} as the tested specimen. 1.Pull-through resistance of fastener/plate combination with thermal barrier (ANSI/ SPRI BPT-1) Altered component: 1581 N (355 lbf) Tested component: 1407 N (316 lbf) 2.Adhesion of vapour barrier to primed thermal barrier (ANSI/SPRI IA-1)Altered component: 92 N (21 lbf) Tested component: 113 N (25 lbf) Conclusion: Altered component obtained lower results than tested component in one of the tests. Rating cannot be extended to the altered specimen. A full-scale CSA A123.21 test is required.AdhesiveAppliedMembraneRoofing System (AARS): A system inwhichtheroofmembraneis bondedtothesubstrateusing adhesives, and all other components belowroofingmembraneare adhered using adhesives as shown in Figure 3 (b). FortheMARStestspecimen,the membrane shall be applied so as to have at least two full membrane widths in the test chamber, resulting in a minimum of three seams. Depending on the fastener row spacing and fastener spacing of the roofingmembrane,thetestingtable widthcanrequiretheapplicationof correction factors. For the AARS and PARS specimens, thelengthofthetestspecimenshall accommodateaminimumoftwo 44 ROOFING CANADA FALL/WINTER 2025'