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We are Part of the Thomas Armstrong Group
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 block.
Hollow Dense concrete blocks are ideal for applications where a durable, lower-weight and high strength wall is required, either above or below damp-proof course (DPC). They are available in ‘Standard’ or ‘Paint-grade’ finishes.
The hollow cores can be filled with poured concrete and reinforced with steel to form incredibly strong walls for applications such as agricultural sheds, commercial and industrial buildings, storage bunkers, pond and pool linings and retaining walls.
Our Hollow Blocks are manufactured from high quality class 2 aggregates and consist of up to 30% recycled raw materials.
Hollow Dense Blocks are manufactured to BS EN 771-3 and are ISO 9001 Quality Assured, ISO 14001 Environmentally Certified and hold BES 6001 ‘Excellent’ and most locations.
'STANDARD' & 'PAINT-GRADE' FINISH VALUES
Face Size (L x H)
Gross Dry Density
Mean Compressive Strengths
Thermal Conductivity (Protected Inner Leaf)
Thermal Conductivity (Exposed Outer Leaf)
Available Texture Finishes
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
1850 - 2100 kg/m³
< 0.6 mm/m
Class A1 Reaction to Fire
Hollow - Group 2
Standard or Paint-grade
140mm, 190mm or 215mm
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 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.
50 Rw, dB
51 Rw, dB
52 Rw, dB
BLOCKS PER PACK
m² PER PACK
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