ENGINEERING JUDGEMENT
As explained in the previous chapters, very often the Jobsite curtain
wall conditions differ from the original design or unanticipated
construction hindrances are encountered and the field conditions
cannot be easily redesigned.
As there are multiple components involved in the curtain wall design,
hence there could be multiple factors in the curtain wall design
installed at site which can vary from the system which is tested with
laboratories like Intertek & UL. Generally, these variations in changes
at site or design from the unit which is actually tested, cannot be
easily or cost effectively redesigned so alternative methods must
be implemented to maintain the integrity of the system. And this
is why it is important that these principles be developed via sound
engineering principles and good judgement.
IFC Engg Guidelines
Perimeter Fire Barrier system engineering judgments should:
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Not be used in lieu of tested systems when tested systems are
available.
Be issued only by firestop manufacturer’s qualified technical
personnel or, in concert with the manufacturer, by a knowledgeable
registered Professional Engineer, or Fire Protection Engineer, or
an independent testing agency that provides listing services for the
systems.
Be based upon interpolation of previously tested perimeter fire barrier
systems that are either sufficiently similar in nature or clearly bracket
the conditions upon which the judgment is to be given. Additional
knowledge and technical interpretations based upon accepted
engineering principals, fire science and fire testing guidelines (e.g.
ASTM E 2032 – Standard Guide for Extension of Data from Fire
Endurance Tests) may also be used as further support data.