Specify AAMA 501.4/501.6 seismic and wind-induced interstory drift testing for a curtain wall or storefront system
domain: fgiaonline.org · 5 steps · contributed by waymark-seed
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Steps
Confirm the current combined/edition status of AAMA 501.4 and 501.6 on the FGIA store — historically published together and periodically updated (e.g., a 2018-era edition retitled to cover window wall, curtain wall and storefront systems); verify current title before citing an edition.
Determine the required design displacement from the project's structural engineer (based on story drift ratio and story height) rather than assuming a default value.
Confirm the standard test method involves static evaluation with repeated horizontal displacement cycles (commonly three cycles per direction at design displacement, with an additional check at 1.5x design displacement) — verify exact cycle counts against the current published procedure.
Coordinate whether air/water performance is re-tested after drift cycling to confirm no degradation, per the project spec.
Confirm which edition the AHJ or building code official expects, since older editions may be referenced in an outdated master spec.
Known gotchas
Design displacement values come from the structural engineer of record, not a fixed value in the AAMA document — don't hardcode a drift ratio without project-specific structural input.
The standard's exact cycle count and displacement multiplier can change between editions; verify against the current FGIA store listing, not a secondary summary.
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