Ash GP Concrete Blocks

Ash GP Concrete Blocks

Lignacite Ltd Third party certifications:
  • BSI Kitemark

    BSI Kitemark

    Certificate type

General purpose, medium density concrete blocks.

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Suitable for use in commercial and housing projects.

Can be used to construct internal walls in commercial, industrial and leisure buildings. The blocks can be used for the following:

  • The inner and outer leaves of external cavity walls;
  • Internal walls including fire break walls;
  • Separating walls including those conforming to Robust Detail specifications;
  • External and internal walls below ground (3.6 N/mm² blocks can be used in both inner leaf and internal walls; 7.3 N/mm² blocks to other locations);
  • Infill units to beam and block flooring.

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


Medium density, load bearing concrete blocks, suitable for facing and general purpose applications. The blocks consist of a specially formulated mix which reduces density, producing a solid block under 20 kg unit weight.

The blocks are medium grey in colour with a fine textured/ scratched surface, providing an enhanced key for plastering and rendering. Available in 100 and 140 mm widths, solid form only.

Features and benefits:

  • Robust and durable.
  • Good surface key for the direct application of plasters and renders.
  • For use internally and externally, above and below ground.
  • High levels of air tightness, sound insulation and fire resistance.
  • Provides a strong background for holding fixings.
  • Over one-third of the materials come from sustainable sources.
  • Credits available under BREEAM 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.
  • Good technical performance, high recycled content

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




Scratched surface






440 x 100 x 215 mm

440 x 140 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


To BS EN 771-3.

Block description

Medium density, load bearing block for general purpose walling applications.


Scratched surface to aid the key of plaster and render finishes.


Group 1.

Compressive strength


Mean value

3.6 N/mm².

7.3 N/mm².

10.4 N/mm².



Thermal conductivity

0.47 W/m·K at 3% moisture content (internal use), 0.51 W/m·K at 5% moisture content (external use).

Thermal resistance

0.212 m²K/W and 0.196 m²K/W.

100 mm thick block, at 3% and 5% moisture content.

0.298 m²K/W and 0.274 m²K/W.

140 mm thick block, at 3% and 5% moisture content.

Recycled content


Work sizes (length x width x height)

440 x 100 x 215 mm.

Unit weight: 14 kg.

440 x 140 x 215 mm.

Unit weight: 19.6 kg.

Tolerance category




Net dry density

1450 kg/m³.

Reaction to fire

Class A1.

Water vapour permeability

5/15 µ.

Product Reference

Ash GP Concrete Blocks

Moisture movement

<0.5 mm/m.


1000 J/kg/K.

Sound reduction index

Rw 44–45 dB (dependent on application).

At 100 mm width.

Fire resistance

2–3 hours.

100 mm block.

3–4 hours.

140 mm block only.

Third-party certification

BSI Kitemark approved.

Environmental information

Recycled content



Ash GP (General Purpose)

Ash GP (General Purpose)

Third party certifications

BSI Kitemark

BSI Kitemark

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