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Bitumen Impregnated Fibre Board

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Estocell is a compressible, bitumen impregnated fibreboard, supplied in sheet form. It is used to form and fill expansion joints between in-situ and precast concrete construction.


Estocell is a compressible joint filler suitable for forming joints between in-situ and pre-cast concrete components.

It is used to form structural expansion and separation joints in:

  • Concrete roads, ramps and runways
  • Bridges and pedestrian areas
  • Concrete pavements and floors
  • Building basement structure and subways
  • Concrete retaining walls


  • Simple and easy to handle and install
  • Will not extrude under compression
  • Resilient
  • Economical

Standards Compliance

  • ASTM D1751 – 99
  • BS 1142 : 1989

Specification Clauses

The expansion joint filler as detailed shall be Estocell supplied by Estop and installed strictly in accordance with the manufacturer’s written instruction.

Design Criteria

Example of a sealed expansion joint in a subway is shown next column:

  • Estojoint / Estoliastic
  • Bond breaking tape
  • Estocell
  • Recessed seal

Design Criteria

  • Estojoint / Estoliastic
  • Bond breaking tape
  • Estopper Rearguard E250
  • Lean concrete
  • Waterproofing membrane
  • Estocell

Physical Properties

Form Compressible Sheet
Solid Content 100%
Recovery > 75%
Weathering Test No Disintegration

Installation Instructions

When Estocell is used to form an expansion joint in concrete, it should be placed against the shuttering on the concreting side before the pour commences.

Copper nails may be used to prevent displacement in joints in suspended slabs.

Estocell may be bonded to the existing slab or previous pour using a suitable adhesive such as Estoflex GP, bitumen emulsion or equivalent wall panel adhesive.

Care should be taken not to contaminate surfaces of the sealing slot with the adhesive.

Joint Sealing

Putting a removable timber former on top of the Estocell can form a joint sealing slot.

Estocell can be installed to the full dept of the slab and cut back to the required depth then using a power brush machine. This method is used for housing estate roads, which cannot be cleaned and sealed until all building work had been completed.

Estocell should be tamped down to ensure that it fills the joint completely and provides continuous support for the joint sealant.

Packing & size

10.0mm thick 1.22m x 2.14m ⁄sheet
12.5mm thick 1.22m x 2.14m ⁄sheet
20.0mm thick 1.22m x 2.14m ⁄sheet
25.0mm thick 1.22m x 2.14m ⁄sheet

Technical Support

Estop offers a technical support package to specifiers, end-users and contractors, as well as on site technical assistance.


Product should be stored in dry and covered area.


There are no known health hazards associates with Estocell in normal use.

Additional Information

Estop manufactures and offers a wide range of complementary products, which includes waterstops, waterproofing products, grouts, anchors, specialized flooring products. In addition, a wide range of products formulated for repair and refurbishment of spalled concrete are available.