AAMA DISTANCE EDUCATION Specifying …

Performance-based standards for windows and doorsrate completely fabricated products according to how theyperform under actual job site conditions rather thanattempting to prescribe detailed physical attributes suchas framing member thickness, assembly details, etc. Theythereby provide a uniform basis for comparing key perform-ance attributes of different manufacturers' windows of thesame type, class and grade for a given application, therebytaking into account the unique properties and comparativestrengths and weaknesses of all profile materials. For win-dows and doors, these essential performance characteristicsare structural performance under wind loading and thelevel of resistance to air leakage, water penetration andforced entry. From this platform, currently represented bythe aama /WDMA/CSA 101 2/A440-05 standard, otherperformance requirements for specific window types ( ,casement, horizontal sliding, etc.), as well as for optionalenergy efficiency attributes ( , thermal performanceand condensation resistance), can be referenced to meetspecific markets or job criteria.

It is the buyer’s task to first determine the tradeoff between performance level and cost that is acceptable for the job at hand. Given equal performance requirements, the

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