To clarify that:
- the requirements of Sentence 184.108.40.206.(1), which
require that all party walls be constructed as firewalls, applies
to situations where buildings of residential occupancy contain more
than 2 houses, and
- the permission to construct the party wall as a fire
separation having not less than a 1 h fire-resistance
rating is limited to situations where fewer than 2 houses with a secondary
suite are adjacent to each other, on the basis that this is restricted
to buildings that are limited in height in which evacuation can be
expected to be relatively quick and that the occupant load is smaller
than what would be expected in a duplex.
This [the measure] is to limit the
probability that fire will spread from one part of a building of residential
occupancy containing more than 2 houses to the rest of the building,
which could lead to damage to the adjacent building.