STRUCTURAL FIRE PRECAUTIONS D - South Ayrshire Council

D
D2.3
NON-COMBUSTIBLE MATERIALS
D2.3 Where an element of structure provides support to a separating floor (see D5.6), a separating wall (see
D5.7), an external wall (see D8.2), or an escape stair (including the floor of a protected lobby) (see
D11.12) which is required to be of materials which are non-combustible, the element of structure must
also be of materials which are non-combustible (see D1.3).
Table 1 to D2.1: Minimum duration and maximum compartment area in a single storey building
Purpose groups and purpose sub-groups Maximum area of a Minimum duration of Minimum
compartment (m 2 ) compartmentation, duration of
[1] where required external walls
(see D3.1)
(see D8.1)
1 Dwellings Unlimited Not required Medium [2, 3]
2A Institutional 1,500 Medium Medium [3]
2B Other residential 2,000 Medium Medium [3]
3 Offices 4,000 Medium Medium [3]
4 Shops and commercial 2,000 [4] Long Medium [5]
5A Assembly and recreational (high risk) 2,000 Medium Medium [5]
5B Assembly and recreational (low risk) 6,000 Long Medium [3]
6A Industrial (high risk) 33,000 Long Medium [5]
6B Industrial (low risk) 93,000 Long Medium [3]
7A Storage (high risk) 1,000 Long [6] Medium [5]
7B Storage (low risk) 14,000 Long Medium [5]
7C Open-sided car park Unlimited Not required Not required
Notes:
1. In a building of purpose groups 3 and 5-7 areas can be doubled where there is an appropriate fire
control system.
2. Short duration for -
a. a dwelling with an appropriate fire control system;
b. a detached building ancillary to a dwelling comprising a garden hut or store, or a building for
keeping animals, birds or other livestock for domestic purposes;
c. a conservatory or porch attached to a dwelling;
d. a garage wall.
3. Short duration for a building more than 1 m from the boundary.
4. Unlimited provided there is an appropriate fire control system.
5. Short duration for a building more than 1 m from the boundary which has an appropriate fire
control system.
6. A building comprising a single compartment of not more than 1000 m 2 is permitted. Where a
building has a floor area more than this, it must be divided into a series of compartments so that no
compartment is more than 200 m 2 if the compartment walls have a medium duration, or 500m 2 if
the compartment walls have a long duration.
Amdt: September 2001
8D