CONCRETE BLOCKS
SOLID DENSE CONCRETE BLOCK - BBD
Build Bloc Ltd offers a versatile range of concrete block solutions for both internal and external applications. All blocks
are quality assured and tested throughout the manufacturing process.
Build Bloc Concrete Blocks conform to BS EN 771-3
PRODUCT SPECIFICATIONS Key features:
DENSE CONCRETE BLOCK TO BS EN 771-3
Category II Aggregate Concrete Masonry Units • Standard finish block
DIMENSIONAL TOLERANCES Category D1 (+3mm, -5mm) • High density improves sound insulation
MEAN UNIT STRENGTH 7.3 N/mm² • High strength
REACTION TO FIRE Class A1
MOISTURE MOVEMENT < 0.6mm/m • Use for above and below ground
WATER VAPOUR PERMEABILITY (µ) 5/15*
• Suitable for external and internal walls
THERMAL CONDUCTIVITY 1.07 W/(mK) 10, dry mat
NET DRY DENSITY 1960 kg/m³ • Use for block & beam flooring system
tested to BS EN 772 and figures noted * taken from BS EN1745
• High fire resistance
SIZE (mm) & WEIGHT (kg)* • Low water absorption
LENGTH HEIGHT WIDTH
440mm 215mm 100mm 140mm
BLOCK WEIGHTS (kg) 18.7 26.5
*Figure is representative of average production weights.
Solid Dense Concrete Blocks
Our dense concrete blocks are the most durable and resilient block which can be used with confidence and are perfect
for both internal and external applications requiring high loadbearing capacity and excellent acoustic performance. Our
state of the art manufacturing plant ensures a consistent and quality product every time.
Responsibly Sourced Materials
At Build Bloc we are committed to minimizing our environmental impact and supporting the local economy by sourcing
materials from as close to the manufacturing plant as possible.
Transportation
With over 20 year’s management experience in transporting building materials, we have developed a superior delivery
model unrivalled by any of our competitors. The Build Bloc fleet of state-of-the-art vehicles guarantee next day delivery
on almost every order.
TEL: 0208 595 6846 | www.buildbloc.co.uk | sales@buildbloc.co.uk
CONCRETE BLOCKS
Delivery and Storage
Concrete blocks should be handled with care. Appropriate risk assessments and Safe Systems of Work should be conducted
before any manual handling tasks. Blocks are normally delivered to site in banded packs on flat bed vehicles. Block packs are
to be mechanically off-loaded on to a clean, firm area in planned locations to avoid double-handling and damage.
Health and Safety
Close attention should be given to safe systems of work when handling concrete blocks. Workers are particularly at risk if they
are repetitively handling blocks heavier than 20 kg. Safe lift heights will vary depending upon block type and weather
conditions.
The following points should be considered before handling concrete blocks:
Units should be moved in packs by mechanical means whenever possible
Appropriate construction site Personal Protective Equipment to be used
Appropriate eye protection and dust suppression/extraction to be used when cutting or chasing
Minimise manual handling by delivering units as close to the place of use as possible
Further information can be found in the HSE Construction Sheet 37 – Handling Building Blocks
Blocklaying
Construction: Blocks should not generally be laid in temperatures at or below 3°C. Masonry wall construction should be in
accordance with the workmanship guidance given in BS 8000-3.
Mortar: Mortar specification must be appropriate for its intended use and in accordance with - PD 6697: 2010
Recommendations for the design of masonry structures to BS EN 1996-1-1 and BS EN 1996-2. It is common practice for
mortar to be provided pre-mixed or dispensed from a calibrated mortar silo on site. The mortar supplier’s recommendations
should be adhered to. Site mixed mortar should be batched consistently and accurately using batching boxes or buckets. The
use of shovels for proportioning should not be used.
Cutting and Chasing: A well ventilated dedicated area should be allocated for cutting and chasing of block work
Jointing and Movement Control: Following construction, buildings are subject to dimensional changes to structures
through settlement, moisture movement and temperature. Joints should be used to account for this movement in accordance
with DP-999.
Finished Block Work: Finished block work should be protected from excessive heat and cold using canvas or polyethylene
tarpaulins to avoid rapid drying out and frost damage.
Painting: Standard finish dense concrete blocks are not intended to be painted directly. A plaster or render finish is to
be applied first.
Rendering and Plastering: Rendering and Plastering work should conform to the relevant BS standards. Adequate
times should be applied between coats
Use in Sulphate Soils: Dense Concrete Blocks are suitable for use in chemically aggressive ground conditions up to and
including Class DS-3.
TEL: 0208 595 6846 | www.buildbloc.co.uk | sales@buildbloc.co.uk
