Lignacrete: Midi Concrete Block Datasheet
Side view of a Lignacrete Midi Block.

Lignacrete Midi Concrete Block

Lignacrete Midi are 140mm solid units with a face size of 290mm x 215mm. They have been developed for easier handling while providing all the performance associated with conventionally sized solid dense blocks.

There are options to specify Standard or Paint Grade finishes, and with unit weights of less than 20kg (the recommended maximum weight for manual handling), Midi blocks are the perfect choice for all commercial and industrial projects.


Specification & Application



Block Mortar

For unreinforced blockwork, the mortar type for work above ground level should be designation (iii) / Compressive Class M4. Stronger mixes may be required for work 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

Block Safe Handling

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

  • 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 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.
  • Blocks should not be installed if the temperature is at or below 3°C and falling.
  • Blocks should always be laid on a full bed of mortar and vertical joints solidly filled.
  • For walls built fair-faced, sample panels are recommended. These should be built prior to commencing block laying and serve as a benchmark for defining and specifying the quality of work required. Please note that for Paint Grade products, colour consistency is not guaranteed. It is advisable to view sample panels at a distance of about 3m from the wall in good natural light.
  • For reinforced walls, the concrete infill strength and reinforcement should be specified by the project engineer.

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Product data updated: 20th Apr 2024

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