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Lignacrete: Lignacrete Standard Concrete Block Datasheet
Side view of a Ligncrete Standard Block.

Lignacrete Lignacrete Standard Concrete Block

Lignacrete Standard 7.3 and 10.4 N/mm² are dense concrete blocks intended for general purpose use above and below ground.

Manufactured to BS EN 771-3, they provide an excellent surface for mortars, renders and plasters, while also providing excellent sound insulation. As the most resilient blocks in our range, they are perfect for higher strength applications where durability and robustness are required.

Generally, 100mm and 140mm blocks have a face size of 440mm x 215mm. Lignacrete 140mm Midi blocks have a face size of 290mm x 215mm and have been developed for ease of handling while providing all the performance associated with conventional size solid units.

Datasheet

Specification & Application

Weights & Pack Sizes

All weights are approximate and subject to normal variations in raw materials.

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
440 x 100 x 21518.919864
440 x 140 x 21526.527848
290 x 140 x 140 (Midi size)17.527948
Table 1 Notes:
(1) Pack sizes may vary depending on the plant (Brandon or Nazeing) producing and delivering the blocks. For the most up-to-date information, please contact our Sales Team via brandonsales@lignacite.co.uk or nazeingsales@lignacite.co.uk. Alternatively, call our Head Office on 01842 810678.

Fire Resistance

Lignacrete Standard 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 Lignacrete loadbearing and non-loadbearing walls are shown in Table 2, derived from the National Annex to BS EN 1996-1-2.

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

Solid blocks
(Group 1 units) No finish
Non-loadbearing wall
(criteria E1)
Loadbearing wall
(criteria RE1)
100mm Lignacrete Standard – All strengths3 hours2 hours
140mm Lignacrete Standard – All strengths4 hours3 hours

Sound Properties

Block TypeAcoustic LiningWeighted Sound Reduction Index Rw
(dB)
100mm Lignacrete – Lining to one face50mm C studs at 600mm centres with 50mm Isover APR insulation, built with 20mm gap from wall. Finished with one layer of 12.5mm Soundbloc plasterboard.64
140mm Lignacrete Midi – Lining to one face50mm C studs at 600mm centres with 50mm Isover APR insulation, built with 20mm gap from wall. Finished with one layer of 12.5mm Soundbloc plasterboard.65
Table Notes:
(1) The acoustic lining should be adequately sealed at all exposed edges.

Thermal Properties

Cavity fill typeInternal finish -
12.5mm plasterboard on dabs
U-values (W/m² K)
Internal finish -
13mm lightweight plaster
U-values (W/m² K)
100mm DriTherm Cavity Slab 32 Ultimate0.270.28
125mm DriTherm Cavity Slab 32 Ultimate0.220.23
150mm DriTherm Cavity Slab 32 Ultimate0.190.20
100mm Isover CWS 320.270.28
125mm Isover CWS 320.220.23
150mm Isover CWS 320.190.20
90mm Kingspan Kooltherm K106 (plus a 10mm cavity)0.180.19
115mm Kingspan Kooltherm K106 (plus a 10mm cavity)0.150.15
140mm Kingspan Kooltherm K106 (plus a 10mm cavity)0.120.13
90mm Eurowall + (plus a 10mm cavity)0.200.20
115mm Eurowall + (plus a 10mm cavity)0.160.16
140mm Eurowall + (plus a 10mm cavity)0.140.14
100mm Xtratherm Cavity Therm0.190.20
125mm Xtratherm Cavity Therm0.160.16
150mm Xtratherm Cavity Therm0.130.14
Cavity fill typeInternal finish -
12.5mm plasterboard on dabs
U-values (W/m² K)
Internal finish -
13mm lightweight plaster
U-values (W/m² K)
60mm Celotex CW40000.250.26
75mm Celotex CW40000.220.22
100mm Celotex CW40000.170.18
60mm Kingspan Kooltherm K1080.230.23
75mm Kingspan Kooltherm K1080.190.20
100mm Kingspan Kooltherm K1080.150.16
60mm Eurowall Cavity0.250.26
75mm Eurowall Cavity0.220.22
100mm Eurowall Cavity0.170.18
100mm Rockwool Partial Fill0.270.28
150mm Rockwool Partial Fill0.190.20
170mm Rockwool Partial Fill0.170.18
100mm Isover CWS 320.260.27
125mm Isover CWS 320.220.22
150mm Isover CWS 320.180.19
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 (always check the manufacturer’s guidance).

Sustainability

Design

Block Mortar

Generally, the mortar type for work above ground level should be designation (iii) / Compressive Class M4. However, where it is needed to maximise the loadbearing capacity of the wall, designation (ii) / Compressive Class M6 mixes should be specified. Stronger mixes may also be required for work below ground.

Table 6 – Mortar Mixes

Site Practice

Lignacrete block:

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Product data updated: 15th Jul 2024

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