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The Carbon Buster is manufactured from more than 50% recycled material. This includes the Carbon8 pellets which are produced by combining CO2, sand, cement and water. The result is a unique aggregate which when incorporated into Lignacite's products, creates the first ever carbon negative building block.

The Carbon Buster block has been developed with low carbon impact as its main benefit. This is achieved not only by using carefully selected raw materials, but by incorporating lightweight aggregates, including graded wood particles, that sequent a large amount of carbon dioxide (CO2). Carbon sequestration is the process of capturing and storing of atmospheric carbon dioxide. In this context Carbon Buster can be described as a carbon reservoir.


  • Incorporates recycled and carbonated aggregates from by-products.
  • Captures more CO2 than is emitted during its manufacture.
  • Suitable for facing and general purpose applications.


Carbon buster blocks are BSI Kitemarked approved to BS EN 771-3. They are Category 1 masonry units.

Movement control:

Movement joints should be considered in accordance with PD 6697 at approximately 6 m spacing. 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 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 PP 6697.

Related literature

The following content references this product:

Standard product features

Face size:

440 x 215 mm.


Medium grey in colour with an open textured surface.

Dry density (net):

1450 kg/m³.

Thermal conductivity:

0.79 W/mK.

Thermal resistance:

  • 100 mm width: 0.111 m²K/W at 3% m/c, 0.103 m²K/W at 5% m/c.
  • 140 mm width: 0.177 m²K/W at 3% m/c, 0.167 m²K/W at 5% m/c.

Fire resistance to BS EN 13501-1:

Class A1. Up to 4 hours depending on width and whether loadbearing or non-loadbearing. Consult technical literature for exact details.


Solid blocks: Group 1.

NBS Specification

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This product is associated with the following NBS Create clause:
45-80-50/300 Aggregate concrete blocks

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Lignacite Ltd


+44 (0)1842 810678

Product reference

Carbon Buster Commodity Blocks



Manufacturer details

Norfolk House,
High Street,
Suffolk, IP27 0AX
Tel +44 (0)1842 810678
Fax +44 (0)1842 814602
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