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Lignacrete Concrete Blocks

Lignacrete Concrete Blocks

Third party certifications:
  • BSI Kitemark

    BSI Kitemark

    Certificate type

Lignacite Ltd

A range of high density, robust, loadbearing units, suitable for internal and external walls. For total design flexibility select from a range of sizes, strengths and finishes.

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External and internal walls, above and below ground. Can be used as infill blocks in beam and block flooring systems. Can also be considered for use in the following locations:

  • The inner and outer leaves of external cavity walls.
  • Internal walls including fire break walls.
  • Separating walls including those conforming to Robust Detail specifications.
  • High strength, loadbearing walls - blocks up to 30 N/mm² available.
  • External and internal walls below ground.
  • Infill units to beam and block flooring.
  • Hollow blocks to construct reinforced retaining walls.

The blocks can accommodate drylining, dense plaster, finishing coats and external rendering. Consult manufacturer for further finish recommendations.


High density concrete blocks suitable for internal and external walls.

The blocks are medium grey to buff in colour. Available in a range of sizes, strengths and grades for design flexibility.

Features and benefits:

  • Loadbearing and robust.
  • High strength.
  • For use internally and externally, above and below ground.
  • High levels of air tightness, sound insulation and fire resistance.
  • Suitable for a wide range of applications, including separating and partition walls.
  • Credits available under BREAAM and Code for Sustainable Homes.
  • CE marked to BS EN 771-3.
  • Can be used to satisfy the requirements of Part L of the Building Regulations.

The mortar type for work above ground level should be designation (iii) / Compressive Class M4. Stronger mixes may be used only with the permission of the designer. Stronger mixes may also be required for work below ground in accordance with PD 6697. Consult manufacturer for details.

Movement joints should be considered in accordance with PD 6697 at approximately 6 m spacings. In areas of concentrated stress, such as those above and below openings, consideration should be given to the use of bed joint masonry reinforcement.

The design of walls should be in accordance with relevant design standards including BS 8103: 2, BS EN 1996-1-1 and the requirements of the Building Regulations.

General information



 (Paint grade and standard), fair faced (natural).


High strength, good sound insulation, above and below ground use


Fair faced

Paint grade

Standard grade



Dense aggregate concrete




440 x 215 x 70 mm

440 x 215 x 90 mm

440 x 215 x 100 mm

440 x 215 x 140 mm

290 x 215 x 140 mm

440 x 215 x 190 mm

440 x 65 x 190 mm

440 x 215 x 215 mm

Uniclass 2015

Pr_20_93_52_01 Aggregate concrete blocksPrimary


E60/297 Proprietary infill blocks

F10/18 Concrete facing blockwork

F10/355 Concrete common blockwork

Specification data - Aggregate concrete blocks Enhanced data


BSI Kitemark approved to BS EN 771-3.

Block description

High density, robust, loadbearing units for internal and external walls.


Medium grey to buff in colour with a texture.


Cellular (Group 2)

Hollow (Group 2)

Solid (Group 1)

Solid Midi (Group 1)

Special size, developed for ease of handling.

Compressive strength


Mean value

3.6 N/mm².

7.3 N/mm².

10.4 N/mm².

22.5 N/mm².

30 N/mm².



Thermal conductivity

1.33 W/m·K at 3% moisture content (internal use), 1.43 W/m·K at 5% moisture content (external use).

Thermal resistance

0.075–0.207 m²K/W depending on width.

Recycled content

High, consult manufacturer for details.

Work sizes (length x width x height)

290 x 140 x 215 mm.

Solid midi only. Unit weight: 17.5 kg.

440 x 75 x 215 mm.

Solid only. Unit weight: 14.4 kg.

440 x 100 x 215 mm.

Solid only. Unit weight: 18.9 kg.

440 x 140 x 215 m.

Available for solid, cellular and hollow. Unit weight: 26.5 kg (solid), 20 kg (cellular and hollow).

440 x 190 x 215 mm.

Solid and hollow only. Unit weight: 35.9 kg (solid), 25 kg (hollow).

440 x 215 x 215 mm.

Solid and hollow only. Unit weight: 40.7 kg (solid), 27.5 kg (hollow).

Tolerance category




Net dry density

Blocks >20.0 N/mm²: 2000 kg/m³, Blocks <20.0 N/mm²: 2100 kg/m³.

Reaction to fire

Class A1.

Water vapour permeability

5/15 µ.

Product Reference

Lignacrete Concrete Blocks

Sound reduction index

Varies dependent on width and application, consult manufacturer for details.

Fire resistance

Varies dependent on width and application, consult manufacturer for details.

Air tightness

Varies dependent on width and application, consult manufacturer for details.

Face grade


For locations requiring a consistent colour and close textured block face.


For locations where a consistent close textured face is required as a background for direct painting.


For locations where the surface will not be visible e.g. for plastering or use below ground.

Moisture movement

<0.6 mm/m.


1000 J/kg/K.

Environmental information



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