3.2.3.15 — Wall Exposed to Adjoining Roof

(1) Except as required by Sentence 3.2.3.20. (2), if buildings are connected by a walkway, each building shall be separated from the walkway by a fire separation with a fire-resistance rating not less than 45 min. (2) Except as permitted by Sentence (3), a walkway connected to a building required to be of noncombustible construction shall also be of noncombustible construction. (2.1) Except as provided in Sentence (3), a walkway connected to a building or part of a building permitted to be of encapsulated mass timber construction shall be of noncombustible construction or encapsulated mass timber construction. (3) A walkway connected to a building required to be of noncombustible construction or to a building or part of a building permitted to be of encapsulated mass timber construction is permitted to be of heavy timber construction provided, (a) not less than 50% of the area of any enclosing perimeter walls is open to the outdoors, and (b) the walkway is at ground level. (4) A walkway of noncombustible construction used only as a pedestrian thoroughfare need not conform to the requirements of Articles 3.2.3.14. and 3.2.3.15. (5) A walkway between buildings shall be not more than 9 m wide.