9.10.16.2. Required Fire Blocks in Wall Assemblies

 9.10.16.2. Required Fire Blocks in Wall Assemblies

This Article indicates where fire blocking is required in #walls. Wall assemblies that have concealed spaces greater than 25 mm (1 in.) in depth created by #furring and spaces between the #studs require fire blocks every 3 m (9 ft. 10 in.) vertically and every 20 m (65 ft. 7 in.) horizontally, unless the exposed construction materials within the space are #noncombustible, have a flame-spread rating of not more than 25, or are filled with #insulation. The value of the flame-spread rating of the combustible materials determines the permitted extent of the concealed space between fire blocks. The materials to be considered include all construction materials regulated by the NBC, including the framing and building services that are located in the concealed space. 

In balloon frame construction where the stud spaces are continuous through two or more storeys, the spaces between the studs have to be blocked off at each level to restrict fire spread (Figure 9.10.-36).

Quoted from Illustrated Users' Guide - NBC2015
#fireblock #concealedspace #flamespreadrating #wallassemblies #balloonframe