3.1.10.4. Parapets

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3.1.10.4. Parapets

1) Except as permitted by Sentence (2) and 3.1.10.3.(2), a firewall shall extend above the roof surface to form a parapet not less than

a) 150mm high for a firewall required to have a fire resistance rating not less than 2h, and

b) 900mm high for a firewall required to have a fire resistance rating not less than 4h.

2) A firewall that separates 2 buildings with roofs at different elevations need not extend above the upper roof surface to form a parapet, provided the difference in elevation between the roofs is more than 3 m.