b'CLASS A ROOFSListingsandtestreportsiden-tifyspecificmaterials,configurations, fastening methods and slope ranges. These elements are not interchangeable unless substitution is explicitly permitted in the listingortestingdocumentation.Even seemingly minor changes can invalidate a Class A rating.For roofing contractors, this distinc-tion is critical. Substitutions often occur for legitimate reasons, including material availability,familiarity,constructability, sequencing or cost. Without clear direc-tion in the contract documents, contrac-tors may unknowingly assume risk that was never explicitly assigned.THE ROLE AND LIMITS OFENGINEERING JUDGMENTEngineeringjudgmentissometimes used where an assembly deviates slightly from a tested configuration. While it can help interpret test data or assess equiva-lency, it does not create a Class A rating and does not bind the Authority Having Jurisdiction (AHJ).www.precisionmetals.ca Using engineering judgment shifts risk to the design team and owner, and accep-Your Metal Specialists tanceremainsdiscretionary.Forthis Roof Panels reason, it should be used sparingly andTested and certified by On-Site Manufacturing - We come to you in consultation with the AHJ, particularlyProudly Made In Canada Pre-Notched - Saving labour $$ where Class A compliance is a regulatory or insurance requirement.PRODUCING QUALITY PRODUCTS FOR THE CONSTRUCTION INDUSTRY SINCE 1975MISCONCEPTION #3:CLASS A IS ALL YOU NEEDAs Class A requirements have expanded, they are increasingly treated as shorthand SURREY LOCATION-604-594-6001|PARKSVILLE LOCATION-778-842-0281 foroverallroofperformance.While Class A addresses an important exterior18 lROOFINGBClSPRING 2026'