b'BUILDING CODEFigure 5: Three different fastener patterns illustrated in one roof assembly test report. These patterns illustrate the fastener applications necessary to achieve three separateDUR values published in the report. Information like this can be very useful to a designer looking for a way to specify application methods for the three principal roof zones, without extrapolating a reduction in securement using ANSI/SPRI WD-1.Figure 6: Three different DURs, correlated with three separate securement systems (A, B and C). When each of the three DURs exceeds the Specified Wind Loads for the corner, edge and field zones of the roof, the singular assembly test may be used to satisfy the requirements of the Code.Code,anysubstitutionsshouldbeCode compliance pathway No. 2:the designer who, for various reasons, limitedtoonematerialcomponentroof assemblies with proven cannot use a roof assembly tested under (i.e., insulation). This is because of thepast performance CSA-A123.21. To be clear, sentence (4) complex and unique chain of connec- Sentence (5) in Article 5.2.2.2. says thatis the primary compliance pathway, and 10 Membraneroofingassemblieswithas the notes to sentence (4) in Article tivityin an assembly test. Annex Fproven past performance for the antic- 5.2.2.2. indicate, the tested uplift resis-inCSA-A123.21providessomeguid- ipatedwindloadsneednotcomplytance and factored load should satisfy anceforAARS,PARSandMARStherequirementsofthecommen-withsentence(4).Itthenrefersthetary titledLimit States Design in the assembly tests, and we advise the Designreader to Note A-5.1.4.1. (5) in Part 5.Users GuideNBC 2015, Structural Authority to proceed with caution. ThissentenceprovidesanoptionforCommentaries (Part 4 of Division B). BUILDING ENVELOPE CONTRACTOR SPECIALIZING IN250-374-0154 westernroofi ng.cainfo@westernroofi ng.ca www.rcabc.org l25'