Is a parapet always required for a firewall?

Is a parapet always required for a firewall?

Answer: not always.

3.1.10.3. Continuity of Firewalls

2) A firewall is permitted to terminate on the underside of a reinforced concrete roof slab, provided

a) the roof slab on both sides of the firewall has a fire-resistance rating not less than:

i) 1h if the firewall is required to have a fire-resistance rating not less than 2h, or

ii) 2h if the firewall is required to have a fire-resistance rating not less than 4h, and

b) there are no concealed spaces within the roof slab in that portion immediately above the firewall.

Design tricks:

If you have a one storey warehouse building with concrete roof, it is possible to divide it into separate buildings by adding firewalls to the underside of concrete roof slab. It is very useful when you want to use combustible construction or have a prohibited occupancy, such as F1, in a building.