Lignacrete: Paint Grade Concrete Block Datasheet
Side view of a Lignacite Paint Grade Block.

Lignacrete Paint Grade Concrete Block

Lignacrete Paint Grade are close textured concrete blocks, which are ideal for walls that require direct decoration. Manufactured to BS EN 771-3, these blocks are tough, durable and suitable for all types of buildings.

Generally, 100mm, 140mm and 215mm 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 maintaining all the performance of conventional size solid units.


Specification & Application

Weights & Pack Sizes

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

Table 1 – Block Weights and Pack Sizes

Thermal Properties

Cavity fill typeNo finish
U-values (W/m² K)
100mm DriTherm Cavity Slab 32 Ultimate0.29
125mm DriTherm Cavity Slab 32 Ultimate0.23
150mm DriTherm Cavity Slab 32 Ultimate0.20
100mm Isover CWS 320.29
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)0.14
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 CW40000.27
75mm Celotex CW40000.23
100mm Celotex CW40000.18
60mm Kingspan Kooltherm K1080.24
75mm Kingspan Kooltherm K1080.20
100mm Kingspan Kooltherm K1080.16
60mm Eurowall Cavity0.27
75mm Eurowall Cavity0.23
100mm Eurowall Cavity0.18
100mm Rockwool Partial Fill0.29
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 (always check the manufacturer’s guidance because this may vary).



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 6 – Mortar Mixes

Mortar Designation
(as per BS 5628-3)
Compressive Strength Class
(as per BS EN 1996)
Recommended mix proportions of materials by volume
(iii)M41:1:5 to 6 - Cement:Lime:Sand.

1:5 to 6 - Cement:Sand with or without air entrainment.

1:4 to 5 - Masonry Cement:Sand (with non-lime filler).

1:3½:4 - Masonry Cement:Sand (with lime filler)
(ii)M61:½:4-4½ - Cement:Lime: Sand.

1:3 to 4 - Cement:Sand with or without air entrainment.

1:2½:3½ - Masonry Cement:Sand (with non-lime filler).

1:3 - Masonry Cement:Sand (with lime filler).

Site Practice

Lignacrete block:

Datasheet View our EPDs Make an Enquiry Specify a Block

Product data updated: 17th Nov 2023

Google HQ: Bearing The Weight Of A Grand Vision


Read Case Study

The Whiteley: Bespoke Blockwork For A Unique Restoration

Mixed Use

Read Case Study

Construction photo of The Whiteley.