Per IBC section 705.5 when two buildings have a separation distance greater than 10’-0" the rating of exterior walls shall comply with both requirements in tables 601 and 602 whichever is stricter, because the danger is assumed to come from the inside. When the buildings are less than 10’-0" the danger is assumed to be from the exterior due to the possibility of self-ignition. The wall must then be rated for both interior and exterior.
My question is how do we determine the rating of an exterior wall with an existing adjacent building less than 10’-0" with a different construction type? Do I use table 706.4 regardless of construction types?
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