9.10.12.4. Protection of #Soffits
This Article sets the requirements for soffits above windows to delay the entry of fire into an #attic space, so that a #building can be safely evacuated, and that firefighting can be facilitated by keeping the fire contained within the suite in which it originated. Fire issuing out of a #window close to a soffit can enter the attic space through a soffit vent, or by burning through the soffit. If the attic space is common to a number of #residential suites, an attic fire can involve all units simultaneously and render the separations between them useless. This risk is reduced by not locating soffit #vents in the vicinity of windows, and by making the soffits more fire resistant.
Quoted from Illustrated Users' Guide - NBC2015
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