Lignacite GP medium density concrete blocks are robust and durable, making them the perfect choice for walls built above and below ground. Manufactured to BS EN 771-3, their textured faces provide an excellent surface for mortars, renders and plasters. They also provide a strong base for holding fixings.

Lignacite GP blocks contain a proportion of recycled materials, and their sustainability performance has been verified through an Environmental Performance Declaration (EPD).

Features and benefits:

Also available in 100 mm thickness (specified separately).
Also available in mean unit strengths of 3.6 or 7.3 N/mm², in both in 100 or 140 mm thicknesses (specified separately).
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.
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.

Sound properties:

Lignacite GP blockwork provides excellent levels of sound insulation between buildings and adjoining rooms. It can be used in cavity party wall constructions in dwellings, satisfying the specifications for lightweight blockwork in accordance with Building Regulations’ Approved Document E. It can also be used to construct party walls meeting Robust Detail specifications (e.g., Robust Details E-WM-2, 4, 8, 11, 14, 17, 20, 21, 22, 27, 28 and 33).

Mortar:

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 6697:2019. Consult manufacturer for details.

Movement joints:

Vertical movement joints should be considered in accordance with masonry design codes and the recommendations of Published Document PD 6697:2019, at 6.0–7.0 metre spacings. In areas of increased stress, such as above and below openings in external walls, the blockwork may need to be reinforced to restrain movement.
The design of walls should be in accordance with relevant design standards including BS 8103-2:2013, BS EN 1996-1-1:2022 and the requirements of the Building Regulations.

Service life:

When properly constructed, the durability of walls built using Lignacite products will match that of traditional masonry and will fulfil their intended function for the life of the building in which they have been installed (typically 100 years).
The blocks themselves will require no maintenance. Maintenance for walls will normally include the replacement of sealant in movement joints and at junctions / openings. Repointing for walls that are exposed to the elements may be necessary towards the end of their service life.

Sustainability:

Lignacite Ltd also meets the requirements of BES 6001 V4.0 – Framework Standard for the Responsible Sourcing of Construction Products (Certificate No: BES 580823). This independently awarded Responsible Sourcing Certification confirms that our products have been made with constituent materials that have been responsibly sourced. This extends to organisational governance, supply chain management and environmental and social aspects, all of which must be addressed in order to ensure the responsible sourcing of construction products. Certification to BES 6001 will allow credits to be gained under environment assessment schemes such as BREEAM.

GP 10.4N EPD