Home > Companies > Thomas Armstrong (Concrete Blocks) Ltd > Insulite Concrete Block

Insulite blocks are the perfect all-round building block. Cost-effective, simple to use and are ideal background block for renders, plasters and for fixing into.

Consist of over 90% high quality recycled and reclaimed raw material.


  • Inner and outer leaf of external cavity walls up to three storeys.
  • Internal partition walls.
  • Block and beam floor infill.
  • Wall below dpc.
  • Acoustic separating party walls to Building Regulations (E&W) Approved Document E and Robust Details.
  • BRE green guide A+ rated walls.

Manufactured to BS EN 771-3.

Related literature

The following content references this product:

Standard product features


440 x 215 mm.

Dimensional tolerance:

Category D1.

Dry density:

1450–1550 kg/m³.

Thermal conductivity:

0.49 W/mK (protected inner leaf), 0.54 W/mK (exposed outer leaf).

Fire resistance to BS EN 13501-1:

Class A1.

Configuration to BS EN 1996-1-1:

Solid, group 1.


Compressive strength:

3.6, 4.2 and 7.3 N/mm² available as standard, higher strengths are available to order.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-80-50/300 Aggregate concrete blocks

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Thomas Armstrong (Concrete Blocks) Ltd


+44 (0)1748 810204

Product reference

Insulite Concrete Block

Compressive strength

[3.6 N/mm²]
[4.2 N/mm²]
[7.3 N/mm²]


[75 mm]
[90 mm]
[100 mm]
[140 mm]
[190 mm]


Close-textured finish available for decorative, fair-faced applications.
Provides an excellent surface for mortars, renders and plasters.

Manufacturer details

Bridge Road,
North Yorkshire, DL10 7HW
Tel +44 (0)1748 810204
Fax +44 (0)1748 813950
NBS Plus
NBS National BIM Library