STRUCTURAL FIRE PRECAUTIONS D - South Ayrshire Council

D
D6.7 – 7.1
c. for a service opening -
i. which is of suitable construction, or where the services are suitably protected, so that in the
event of fire, the level of fire safety performance required is maintained, and
ii.
where it is suitably fire-stopped.
JUNCTIONS
D6.8 Where a wall, floor or other part of a building which is required to have a level of fire safety performance,
abuts a structure containing a cavity, a cavity barrier with a level of fire safety performance (see
D1.3) with a short duration must be installed so as to extend the line of the structure with the level of
fire safety performance,
except -
a. a cavity formed by two leaves of masonry or concrete at least 75 mm thick; or
b. a cavity formed by overcladding, both surfaces of which are non-combustible or low risk materials,
attached to a masonry or concrete external wall or a concrete roof and the cavity contains only noncombustible
materials; or
c. in the case of a wall which is required to have a level of fire safety performance only because it is
loadbearing.
D6.9* A cavity barrier must be tightly fitted to rigid construction, or where this is not possible (for example, in
the case of a junction with slates, tiles, corrugated sheeting or similar materials) the junction must be
suitably fire-stopped.
D6.10 A cavity barrier must be fixed so that its performance is not affected by -
a. movement of the building due to subsidence, shrinkage or thermal change;
b. collapse in a fire of any services penetrating it;
c. failure in a fire of its fixings;
d. failure in a fire of any material or element of structure which it abuts,
except -
where a cavity barrier is installed between a roof and a ceiling, there is no requirement to protect
roof members supporting the cavity barrier.
D7 Fire spread on internal linings
PRINCIPLES
D7.1* In order to resist the spread of fire and smoke, every room, fire-fighting shaft, protected zone or unprotected
zone, must have wall and ceiling surfaces with a level of fire safety performance (see D1.3) which
meet the requirements of the table to this standard,
excepta.
in a room any part of the wall may be of one risk category higher than that required (but not very
high risk) where the total area of those parts in any 1 room is not more than either half the floor
Amdt: September 2001
20D