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In any residential building or building of mixed occupancy with one of the occupancies being residential, the number of dwelling units may be increased by more than one dwelling unit above the number of legally established dwelling units providing the building complies with all of the requirements listed in Section 13-200-230, and also the following additional requirements:
(a) Stairways shall be enclosed with walls of one hour construction in buildings not exceeding three stories in height. Stairways shall be enclosed with walls of two hour construction if the building exceeds three stories in height. Stairwell enclosures may be combustible or noncombustible construction as long as the required separation ratings are met.
(b) Stairwell doors shall be one and three-fourths inches solid-core wood with one and three-fourths inches rabbeted wood frames in buildings not exceeding three stories in height. Stairwell doors shall be Class B and frames in buildings exceeding three stories in height. All stair doors shall be self-closing.
(c) All existing dwelling and corridor separations shall be one-half-hour rated construction, combustible or noncombustible. All new dwelling and corridor separations shall be one hour rated construction, combustible, or noncombustible.
(d) Corridor doors to dwelling units shall be one and three-fourths inches solid core wood with one and three-fourths inches rabbeted wood frames. All corridor doors to dwelling units shall be self-closing.
(e) Heating plant enclosures shall comply with the requirements of Section 15-8-190.
(f) Basement ceilings shall comply with the requirements of Section 13-60-200.
(Prior code § 78.1-23; Amend Coun. J. 10-28-87, p. 5549)