www.rcabc.org  l  21 Over 30 Years Experience in Roofing, Sheetmetal, Waterproofing and Panel System Installations for Commercial, Industrial and Large Scale Residential Projects. Serving Western Canada & More. KELOWNA (Head Office) P: 250.765.3866 VERNON P: 250.542.5544 laingroofing.com Experience Makes The Difference. Let’s Build Something Great! Quality products since 1913 Black Jack is proud to serve Canada with quality roofing and waterproofing products. Learn more at 1-800-387-6925 or visit www.blackjackcoatings.ca. Quality products since 1913 Black Jack is proud to serve Canada with quality roofing and waterproofing products. Learn more at 1-800-387-6925 or visit www.blackjackcoatings.ca. Quality products since 1913 Black Jack is proud to serve Canada with quality roofing and waterproofing products. Learn more at 1-800-387-6925 or visit www.blackjackcoatings.ca. TECHNICAL UPDATE 2.  The roof assembly or assemblies (if more than one are selected to resist the specified wind loads), inclusive of the materials to be used, using one of the following three compliance pathways: a)  A Tested Assembly (the quickest, “off-the-shelf” approach to building a roof assembly) b)  An assembly with “Proven Past Performance” (see the requirements in the Notes to Part 5 – Environmental Separation, A-5.1.4.1.(5) Past Performance as Basis for Compliance with Respect to Structural Loads. The RoofStar Guarantee Standards require that the Design Authority receive manufacturer’s assurances in writing, since it is typically a manufacturer who offers an assembly as capable of performing satisfactorily on the designed building) c)  A custom-engineered asse- mbly, with securement methods and patterns. What about specifying the applica- tion? So many specifications venture to prescribe trade-specific requirements, often displayed as a cherry-picked list of this or that. We suggest keeping it simple by concisely stating that the roof assembly must be installed in keeping with the design of the specified assembly and with the RoofStar Guarantee Standards published in the RCABC Roofing Practices Manual. That covers all the bases, avoids misdirecting the roofer, and ensures there are no internal contradictions in the specifications. Descriptive Pathway In the descriptive approach, the Design Authority describes the desired outcome, but leaves the “how” to the bidder. For example, the descriptive specification should list the specified wind loads and provide clear direc- tives for the roof assembly design (for example, what the minimum resistance values should be for the three roof zones, and what the dimensions of the