how to feature
how to... fire barrier cut and
pushed up into profile
as stopping
angle or clamping plate
fixing to fire barrier to
purlin with self tapping
screws at 450mm centres
...correctly install fire barriers above the line of
a fire rated partition within the ceiling void
Demountable partitioning is routinely with fire barriers. A cavity barrier is be used to maintain the line of fire barrier draped over
suspended ceiling and
installed to the underside of a designed to reduce the spread of compartmentation but must be a max
450mm wired to grid, min 100mm
suspended ceiling. This provides a cost smoke and flame within a ceiling void. proprietary and certified fire barrier lap - if not wired, overlap
is min 150mm
effective and efficient way of creating The Building Regulations note this risk equal to or greater than the
offices and meeting rooms within a in Approved Document B, Volume 2, B3 performance of the partition, ie 30/30
large space, as ceilings can be installed internal fire spread (structure), and or 60/60.
over the whole space rather than in provide guidance for their use, It is important that fire barriers are
adjacent barriers butt
individual areas, partitioning layouts installation and material in section 9: installed in strict accordance with the jointed and wired
are more flexible and costs are saved concealed spaces (cavities). Similar manufacturer’s installation instructions, tightly together
by reducing the number of ceiling and provisions apply in Scotland (Technical including the stitching/fastening
2mm tested angle
partitioning components and their Handbook B 2010) and Northern together of blanket joints and use of clamped at max fixed to soffit at max
300mm centres with
installation cost. Ireland (Technical Booklet E 2005). secure fixings to the soffit and head M6 bolts and nuts
750mm centres
When partitioning is installed in this Cavity barriers are not appropriate of the partition.
way (not taken through the ceiling to to complete a line of compartmentation Any penetrations should be made
the soffit), and is specified to provide up through a ceiling or roof cavity. good with proprietary fire stopping
acoustic and/or fire performance, then Compartmentation should be systems to ensure the fire resistance
either a cavity barrier or fire barrier maintained by extending compartment performance of the cavity barrier is concrete soffit
must be installed between the walls up to full storey height to a maintained. See ASFP Red Book – Fire max max two layers of 50mm proprietary
300mm 150mm fire barrier, vertical joints
suspended ceiling and the soffit along compartment floor or the roof. stopping: Linear joint seals, penetration staggered and stitched
the lines of partitioning to maintain the Approved Document B, 9.3b, Table 13 seals and small cavity barriers, 3rd suspended ceiling
integrity and performance of the gives guidance on the maximum edition for detailed descriptions and fire resistant wall
partition line. dimension of 20m in any direction. methodology. This can be downloaded
The performance of these barriers Every cavity barrier should be from www.asfp.org.uk
must be equal to or greater than the constructed to provide a fire Passive fire protection products
performance of the specified resistance performance of at least 30 should ideally be third party
partitioning they are installed above. minutes integrity and 15 minutes certificated and installed by
In the case of fire it is important insulation 30/15 (9.13). contractors holding third party
that cavity barriers are not confused Fire barriers on the other hand can certification for that activity.
9 www.ais-interiors.org.uk
