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Lignacite ECO: 50 Concrete Blocks Datasheet
Side view of a Lignacite Fair Face Block.

Lignacite ECO 50 Concrete Blocks

Lignacite ECO 50 concrete blocks have been developed to incorporate a minimum 50% recycled content thereby contributing to projects that are required to meet recycling targets.

The blocks are available in a Fair Face and Paint Grade finish.

Manufactured to BS EN 771-3, ECO 50 blocks are robust and durable, offering excellent technical performance for a wide range of applications. Available in strengths of 3.6N/mm2 and 7.3N/mm2, their unique mix, consisting of cement, fine aggregates and recycled materials, contributes to their technical qualities.

The ECO 50 140mm version is specially formulated to optimise block density, producing a solid block with a unit weight of less than 20kg. Please note that there is a slight colour difference between ECO 50 140mm and ECO 50 100mm blocks.

In addition, we offer delivery using HVO (hydrogenated vegetable oil) fueled vehicles to locations in London, reducing the carbon embodiment for delivery by up to 95%.

An Environmental Product Declaration (EPD) will be available in 2025.

Lignacite concrete blocks in Chapelfield Shopping Centre in Norwich

Specification & Application

Weights & Pack Sizes

Table 1 – Block Weights and Pack Sizes

Size mm nominal
(mm)
(L x W x H)
Unit weight
(kg)
Laid weight inc. mortar
(kg/m²)
No. of blocks per pack
Solid 440 x 100 x 21514.915972
Solid 440 x 140 x 21519.220648
Table 1 Notes:
(1) Weights are based on 3% moisture content by volume.

Fire Resistance

ECO 50 blocks are rated as Class A1 in accordance with BS EN 13501-1:2007+A1:2009. A1 materials are completely non-combustible and make no contribution to fire.

The fire resistance periods of ECO 50 loadbearing and non-loadbearing walls are shown in Table 2, derived from the National Annex to BS EN 1996-1-2. This is applicable to all strengths of Lignacite.

The fire resistance of loadbearing walls is influenced by the proportion of the load on a wall, which is annotated in the National Annex as a ≤1.0 or a ≤0.6. The fire values presented are based on the worst loading case (≤1.0) and can therefore be safely used for all loading conditions.

The thicknesses shown are for masonry alone, excluding finishes. For the fire resistance of walls with finishes, refer to the Lignacite Design Guide – Fire Resistance.

Table 2 – Fire Resistance

Sound Insulation

Thermal Properties

Cavity fill typeNo Finish
U-values (W/m² K)
100mm DriTherm Cavity Slab 32 Ultimate0.28
125mm DriTherm Cavity Slab 32 Ultimate0.23
150mm DriTherm Cavity Slab 32 Ultimate0.20
100mm Isover CWS 320.28
125mm Isover CWS 320.23
150mm Isover CWS 320.20
90mm Kingspan Kooltherm K106 (plus a 10mm cavity)0.19
115mm Kingspan Kooltherm K106 (plus a 10mm cavity)0.15
140mm Kingspan Kooltherm K106 (plus a 10mm cavity)0.12
90mm Eurowall + (plus a 10mm cavity)0.21
115mm Eurowall + (plus a 10mm cavity)0.17
140mm Eurowall + (plus a 10mm cavity)0.14
100mm Xtratherm Cavity Therm0.20
125mm Xtratherm Cavity Therm0.16
150mm Xtratherm Cavity Therm0.14
Cavity fill typeNo Finish
U-values (W/m² K)
60mm Celotex CW40000.26
75mm Celotex CW40000.22
100mm Celotex CW40000.18
60mm Kingspan Kooltherm K1080.24
75mm Kingspan Kooltherm K1080.20
100mm Kingspan Kooltherm K1080.16
60mm Eurowall Cavity0.26
75mm Eurowall Cavity0.22
100mm Eurowall Cavity0.18
100mm Rockwool Partial Fill0.28
150mm Rockwool Partial Fill0.20
170mm Rockwool Partial Fill0.18
100mm Isover CWS 320.27
125mm Isover CWS 320.22
150mm Isover CWS 320.19
Cavity Fill Table's Notes:
(1) The U-values shown are based on the use of various proprietary insulation products. Alternative products can be used, provided they can achieve an equivalent thermal resistance (m² K/W).
(2) Wall ties are assumed to be stainless steel with a cross-sectional area of no more than 12.5mm² for structural cavities up to 125mm wide.
(3) The suitability of full fill cavity insulation materials will depend on exposure conditions and should be confirmed by the designer. For partial cavity fill, a 50mm residual should be maintained or as recommended by the manufacturer.

Sustainability

Design

Block Mortar

Generally, the mortar type for work above ground level should be designation (iii) / Compressive Class M4. Stronger mixes may be required if blocks are used below ground.

Table 7 – Mortar Mixes

Site Practice

Block Surface Finish Recommendations

Direct Painting

A mist coat followed by at least two coats of emulsion will provide a good finish. The actual coverage will depend on the quality of the paint and how it is applied e.g., brush, roller or by spray. Always ensure that each coat of paint has fully dried before any further layers are added.

Block Safe Handling

For detailed advice, refer to Lignacite’s Sitework Guide and the Product Health & Safety Data sheet.

  • ECO 50 concrete block packs may be stacked on firm and level surfaces to a maximum height of 2 packs. Consideration of handling equipment’s suitability for site terrain and safety limits should also be given. Hand-operated pallet trucks may not be suitable unless pallets specific for this purpose are used and loads do not exceed the limits of the pallet truck or its operator(s). Care should be taken when opening packs that are wrapped or banded to ensure that items do not fall or otherwise endanger persons handling the blocks or those nearby.
  • Handling of ECO 50 concrete blocks should be undertaken in accordance with HSE Construction Sheet No. CIS77 ‘Preventing injury from handling heavy blocks’ (Construction Industry Advisory Committee) and in accordance with the Manual Handling Regulations 1992 (as amended). This concludes that there is a high risk of injury to individuals who repetitively manually handle blocks in excess of 20 kg. Where practical, mechanical handling equipment should be used to transport block packs to the area of work.
  • ECO 50 concrete blocks should not be installed if the temperature is at or below 3°C and falling.
  • ECO 50 concrete blocks should always be laid on a full bed of mortar and vertical joints solidly filled.
  • For walls built fair, sample panels are recommended and should be built prior to commencing ECO 50 concrete block laying to serve as a benchmark for defining and specifying the quality of work required. Please note that some block colour variation will occur due to the use of naturally occurring raw materials. It is advisable to view sample panels at a distance of about 3m from the wall in good natural light.

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Product data updated: 11th Feb 2025

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