For sales, product and technical advice
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We are Part of the Thomas Armstrong Group
These lightweight aggregate blocks are designed to offer the builder a low weight, loadbearing block with enhanced thermal properties suitable for a wide range of applications.
Ultralite blocks are manufactured to BS EN 771-3 and are ISO 9001 Quality Assured, ISO 14001 Environmentally Certified and hold BES 6001 ‘Excellent’.
Weighing less than 20kg, these high-quality aggregate blocks are manufactured from low density, quality aggregates and available in a range of sizes. These lightweight concrete blocks are only available in a ‘Standard’ texture finish providing an excellent surface for mortars, renders and plasters.
The block and texture images are intended for indicative purposes only and actual textures and shades may vary between manufacturing locations. Please contact your regional sales office for further information and sample blocks. We advise the construction of sample panels on site as masonry appearance cannot be appreciated from individual blocks.
Face Size (L x H)
Gross Dry Density
Mean Compressive Strengths
Thermal Conductivity (Protected Inner Leaf)
Thermal Conductivity (Exposed Outer Leaf)
Available Texture Finish
BS EN 771-3
BS EN 772-16
BS EN 772-13
BS EN 772-1
BS EN 771-3
BS EN 1745
BS EN 1745
BS EN 772-14
BS EN 13501-1
BS EN 1996-1-1
440mm x 215mm
950 - 1050 kg/m³
< 0.6 mm/m
Class A1 Reaction to Fire
Solid - Group 1
90mm, 100mm or 140mm
Walled weight is for a single-leaf wall, plastered on both sides.
Sound Reduction Rw values are based on wall mass and assumes a plastered finish on both sides.
The concrete block weights quoted above are approximate and include the typical additional weight from the moisture content.
Fire resistance periods to BS 5628-3 for a single-leaf, non-loadbearing plastered wall.
42 Rw, dB
43 Rw, dB
46 Rw, dB
BLOCKS PER PACK
72 or 90
48 or 60
m² PER PACK
7.2 or 9
4.8 or 6
Pack details may vary slightly between manufacturing locations. Always check details with your nearest sales office.
Thomas Armstrong (Concrete Blocks) Ltd
Part of the Thomas Armstrong (Holdings) Ltd
T: 01900 68211
F: 01900 602672