The Fenestration and Glazing Industry Alliance (FGIA) has released updated editions of three recommended test methods addressing seismic movement in fenestration and glazing systems: AAMA 501.4-26, AAMA 501.6-26 and AAMA 501.7-26.
AAMA 501.4-26 evaluates windows, window walls, curtain walls and storefront systems subjected to specified horizontal inter-story displacement. AAMA 501.6-26 determines the horizontal racking displacement that can cause representative architectural glass panels to fall out under controlled laboratory conditions. AAMA 501.7-26 evaluates similar fenestration and storefront systems under specified vertical inter-story movements.
According to Lothar Erkens of Winco Window Company, Vice Chair of FGIA’s Seismic and Wind-Induced Inter-Story Drift Review Task Group, the principal change is improved alignment between all three documents.
AAMA 501.7 was last updated in 2017, while AAMA 501.4 and 501.6 were revised in 2018. The new editions are available through FGIA for $25 for members and $70 for non-members. 
Source: FGIA with additional information added by Glass Balkan
