§ 4-240.01. Building Planning; Section R-302, Fire Resistant Construction.

(a)

Section R-302.2.2, Parapets. Parapets constructed in accordance with Section R-302.2.3 shall be provided for townhouses as an extension of common exteriors or walls in accordance with the following:

(1)

Where roof surfaces adjacent to the wall or walls are at the same elevation, the parapet shall extend not less than thirty (30) inches above the roof surfaces; and

(2)

Where roof structures adjacent to the wall or walls are at different elevations and the higher roof is not more than thirty (30) inches above the lower roof, the parapet shall extend not less than thirty (30) inches above the lower roof surface.

Exception: A parapet is not required in Subsections (1) and (2) of this Section when townhouses are provided with residential sprinkler systems installed in accordance with Section 903 of the IBC, or when the roof is covered with a minimum Class C roof covering and the roof decking or sheathing is of noncombustible materials or approved fire-retardant treated wood for a distance of four (4) feet on each side of the wall or walls, or one layer of five-eighths (5/8) inch, or Type X gypsum board is installed directly beneath the roof decking or sheathing for a distance of four (4) feet on each side of the wall or walls.

(3)

A parapet is not required where roof surfaces adjacent to the wall or walls are at different elevations and the higher roof is more than thirty (30) inches above the lower roof. The common wall construction from the lower roof to the underside of the higher roof deck shall not have less than a one (1) hour fire-resistive rating. The wall shall be rated for exposure from both sides.

(CB-90-2015)