Lignacrete 290 x 215 x 140 mm Midi 22.5 N Concrete Blocks - High Density Robust Loadbearing Units

Lignacrete dense concrete blocks are robust and durable with a technical performance that will fulfil most applications. They are manufactured to BS EN 771-3 and are available in standard and paint grade (close textured for direct painting). High strength blocks up to 30 N/mm² are available for demanding, loadbearing designs. Midi blocks have been developed for easier handling while retaining the performance of conventional-size solid blocks.

Features and benefits:

• Loadbearing and robust.
• High strength.
• For use internally and externally, above and below ground.
• High levels of air tightness, sound insulation and fire resistance.
• Suitable for a wide range of applications, including separating and partition walls.
• 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.

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.

Vertical movement joints should be considered in accordance with masonry design codes and the recommendations of Published Document PD 6697, at 6.0-8.0 metre spacings. In areas of raised stress, such as above and below openings in external walls, the blockwork may need to be reinforced to restrain movement.

The design of walls using Lignacrete blocks should be in accordance with relevant design standards, including BS 8103: Part 2 and BS EN 1996-1-1 and the requirements of the Building Regulations.