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Intumescent Non Fibrous Fire Stopping Blocks

Product 3


Non-fibrous intumescent blocks for fire-stopping gaps around services

Not available to purchase online.

We need to ask you a few more questions and ensure this is the suitable product for your needs.

To order please call us on +44 (0) 1 304 842 555


Non-Fibrous Fire Stopping Blocks

Fire stopping blocks designed with non fibrous sponge. Fixing fire stopping blocks in ceilings, walls or floors creates a temporary or permanent fire stopping barrier. Clad with foil and intumescent strips. Blocks expand in opposite directions during a fire, locking in place to seal the void.

Provides both an effective fire and smoke barrier to prevent firespread and dangerous smoke inhalation. Self-adhesive strips on the sides join blocks together and also aid application of blocks.

  • Lightweight and self-supporting, available in 1m length and varying depths according to the order reference tab.
  • Slabs can provide up to 2 hours fire rating dependant on requirements.

Fire stop intumescent blocks can also be used in conjunction with Firoblok sleeves to wrap around cables, services or pipes of all materials passing through walls, floors or ceilings. Our non-fibrous fire stop blocks are suitable for hospital buildings and sterile rooms, including computer rooms. Its alternative sponge material eliminates risks of fibre irritation and damage to skin, eyes and also the respiratory system and provides an effective fire barrier.

Fire barriers provide an effective solution for gaps or voids within buildings that require fire protection. Browse our full range of fire barrier products.


– Great for fire-stopping voids in compartmentalised walls and floors

– Easily installed around existing services and can be cut to shape to accommodate new ones

– Can be used in conjunction with intumescent wraps or collars to provide 2 hours protection or more for services passing through walls and floors

– Can be used between screen walling and concrete floors as a firebreak

– Non-fibrous material is ideal for use in sterile or clean rooms

Application Instructions

The Intumescent Blocks can be cut with a sharp knife or hacksaw blade, fitting into
the opening to form a fire seal. Can be cut and pushed around services and pipes.
Where plastic pipes are 75mm or over then use Envirograf Wrap or Pipe Sleeve
fixing into the blocks. Where blocks are going over cable trays, leave a small gap and
use Envirograf Product 29 Cable Tray Pillows. The blocks have double-sided tape
around the edges so they can be adhered to each other to form a smoke seal. Where
there are any open joints use Envirograf Product 63 Intumescent Cement Filler of
Product 61 CS Stopper.
Envirograf Intumescent Blocks can be used between screen walling and concrete
floors as a firebreak.

Order References / Sizes

REF                        SIZE                                                       LENGTH                PROTECTION    

SIB1                           50mm thick x 150mm wide             1000mm                               1 hour

SIB1/A                       50mm thick x 100mm wide             1000mm                               1 hour

SIB1/B                       50mm thick x   50mm wide             1000mm                               1 hour

SIB2                         100mm thick x 150mm wide             1000mm                               2 hours

SIB2/A                     100mm thick x 100mm wide             1000mm                               2 hours

SIB2/B                     100mm thick x   50mm wide             1000mm                               2 hours