9.10.16.1. Required Fire Blocks in Concealed Spaces
The framing of an opening for #stairs through a wood joist floor normally requires a #framing member for structural integrity at the top and bottom of each #stairway and, in so doing, provides a fire block as seen in Figure 9.10.-34.
Quoted from Illustrated Users' Guide - NBC2015
#fireblock #concealedspace #woodjoist
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