THE BBA CERTIFICATION
Weathertightness – the system will resist the passage of wind-driven rain, snow, run-off water and dust into the interior of the building
Air barrier continuity – the system will contribute to maintaining air barrier continuity at lintels, jambs and sills
Resistance to damage – the system is suitably robust so as not to be damaged during installation
Durability – the system will continue to function for the lifetime of the frame around which it is installed