Products
Rocksilk Smoke and Fire Barrier is made from rock mineral
wool, and formed into a flexible mattress faced on one side with
galvanised wire mesh stitched in position. Rocksilk Smoke and Fire
Barrier is also available foil faced on one or both sides.
Typical Construction
For one hour fire resistance. Two layers of 50mm Rocksilk
Smoke and Fire Barrier, separated by a 50mm air space, applied as a
hanging curtain with wire mesh to the outside, supported
continuously from above and both sides.
At the base it is either lapped freely on to the back of a
suspended ceiling, or fixed to a partition head. Use foil faced
Rocksilk Smoke and Fire Barrier when the ceiling void is used as an
air plenum.
Installation
Performance
Fire performance
The base rock mineral wool of Rocksilk Smoke and Fire Barrier
is classified as non-combustible to BS 476: Part 4: 1970. Rocksilk
Smoke and Fire Barrier has a Class 1 surface spread of flame to BS
476: Part 7: 1997 and is Class ‘O’ to the Building
Regulations.
When subjected to full-scale fire resistance tests to BS 476:
Part 22: 1987, a system comprising a double layer of 50mm Rocksilk
Smoke and Fire Barrier, fixed as specified on page 7, achieved 61
minutes insulation, and retained its integrity for 66 minutes,
after which time the test was discontinued.
A double layer of 50mm Rocksilk Smoke and Fire Barrier thereby
satisfies the criteria laid down in the Building Regulations for
one hour cavity barriers. These tests incorporated vertical and
horizontal joints between barriers. Fire resistance is effective
from either side of the barrier.
When tested, the wire side was exposed to the furnace. This is
the side most vulnerable to fire. Tests are available for a two
hour fire test. Apply directly to Knauf Insulation for
details.
Acoustic performance
A cavity barrier, comprising a double layer of foil faced 50mm
Rocksilk Smoke and Fire Barrier, fixed as shown on page 6, will
offer significant sound reduction. When coupled with a ceiling
system offering at least 32 dB sound reduction and fixed to the
head of the partition, the flanking path through the ceiling and
cavity barrier can achieve a sound reduction of 50 dB.
Advantages
- Two Layers of 50mm Rocksilk Smoke and Fire Barrier with 50mm
airspace
- Wire mesh to the outside
- System uses standard metal components
- Achieves 1 hour fire protection in terms of both insulation and
integrity System offers both fire and acoustic performance
Installation Instructions