Building Codes and Ordinances ARC 227 - Architectural Design ...

Table 602
Table 602 specifies the fire-resistance rating requirements of exterior walls based on fire-separation
distance as well as type of construction and occupancy groups.
It is important to compare ratings required in Table 601 and table 602
Fire separation distance –defined in section 702
“The distance measured from the building face to the closest interior lot line, to the
centerline of a street, alley or public way, or to an imaginary line between two buildings on the
lot. The distance shall be measured at right angles to the wall”
The fire-resistive requirements decrease with increasing distance between buildings.
they also decrease in relation to decreasing construction type requirements.
Table 602 also builds in assumptions about the hazard of occupancies relative to fire
separation distances – the principle is that increased distances offset the hazards presented by
various occupancies.
The amount of openings allowed in exterior walls is governed in section 7 under Table 704.8