Envirograf Intumescent Non-Fibrous Fire Stop Blocks

Availability: In Stock


A fire resistant non-fibrous sponge block which can be used as a temporary or permanent fire stopping method in walls or floors. Clad with foil and intumescent strips, the block expands in opposite directions in a fire, locking in place and sealing the void. Non-fibrous intumescent blocks for fire-stopping gaps around services. 1m long.

A non-flammable, non-fibrous and compressible foil clad sponge intumescent block, 1m long, with self-adhesive tape fitted down both sides of the foil for joining together. Designed to give a fire and smoke barrier. Suitable for sterile and clean areas. Can be compressed together, taken out to work on services, cable trays, etc. and then re-fitted both in walls and floors.  (SIBI1 provide 1 hour’s protection, SIBI2 provide 2 hours’ protection).


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 up to 2 hours protection 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.

It 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.


Next day delivery available

peace of mind

14 day returns policy

price match

Call for the best prices

01752 690997

Speak to our experts


, , , , ,