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Lignacrete: Hollow Block Datasheet

Lignacrete Hollow Block

Lignacrete Hollow 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). If needed, the vertical cores of hollow blocks can be reinforced for additional strength.

Datasheet

Specification & Application

Sustainability

Design

Block Wall Ties

When hollow blocks are used in cavity construction, wall ties should be embedded 50mm into the mortar on each leaf, staggered in alternate courses and spaced in accordance with the following.

Table 5 – Wall Tie Spacings

Leaf Thickness
(mm)
Cavity Width
(mm)
Horizontal Spacing
(mm)
Vertical Spacing
(mm)
Ties per m²
Less than 90mm50 - 754504504.9
Over 90mm50 - 1509004502.5

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 and when the blockwork is to be vertically reinforced.

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

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Product data updated: 21st Mar 2024

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