b'BUILDING CODEthe manufacturers warranty isnt voided by them. If it is, apply the requirements in CSA A123.51.Third,dontgetcategoricalabout climatezonecategories.Theycanbe fluid and shouldnt be relied on for a go, no go decision about eave protection. At least two cities in British Columbia fallwithinmultipleclimatezones.If anything,leteaveprotectionbethe default, not the exception.EAVE PROTECTION FOR SLOPES1:3 AND GREATERTo recap, when laminated asphalt shin-gles are applied to low slopes (defined at slopes less than 1:3), the requirements Figure 9 that apply are found in CSA A123.51. But what about slopes steeper than 1:3? tion may still be required. And, while theSecond, three-tab strip shingles mayAgain, because Section 9.26. in the code reader already knows that conditions (a)still be subject to the requirements ofdoes not appear to apply to laminated through (d) may obviate the need for eavethe code in Article 9.26.8.4., but only ifasphalt shingles, the reader must default protection, they apply only when there isnopotentialforleakagecausedby ice damming.Secondly,notethatwhereaseave protection in the code must extend to a line not less than 300 mm inside the inner face of the exterior wall (Article 9.26.5.1.),theCSAstandardrequires thatthelinebeextendedto600mm (Subsection 5.2.2., Figures 9 and 10).What shall we make of all this? First, understandthatthecodestillcarries legacylanguageforshinglesthatare nolongermanufacturedormarketed in Canada. Therefore, where laminated shingles are specified for slopes less than 1:3, the CSA standard A123.51 must be used, and in that standard eave protec-tion is required where the potential forFigure 10leakage.from ice damming exists.BUILDING ENVELOPE CONTRACTOR SPECIALIZING IN250-374-0154 westernroofi ng.cainfo@westernroofi ng.ca 20 lROOFINGBClSUMMER 2024'