There are 3 firewalls on the floor plan below. What are the implications of these firewalls in our design?
#design #building #firewalls
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2015 National Building Code
9.10.4.4. Roof-Top Enclosures
1) Roof-top enclosures provided for elevator machinery, stairways or service rooms, used for no purpose other than for service to the building, shall not be considered as a storey in calculating the building height.
2018 BC Building Code
9.10.4.4. Roof-Top Enclosures
1) A roof-top enclosure shall not be considered as a storey in calculating the building height if the roof-top enclosure is provided for
a) elevator machinery,
b) a service room,
c) a stairway used for no purpose other than for access or egress,
d) an elevator lobby used for no purpose other than for access or egress, or
e) a combination thereof
The difference is:
If you are designing a 3 storey townhouse with a roof top patio and stairway, it will be 3 storey in BC, but 4 storey in other provinces, such as Alberta and Saskatchewan.
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