Fibo 850 Concrete Blocks
BSI Kitemark
Certificate type
General purpose, lightweight concrete blocks.
For use in housing or extension projects. It can also be used to construct walls in other buildings where there is a requirement to specify blockwork with a low weight, e.g. partition walls on floor slabs. Can be considered for use in the following locations:
- Inner and outer leaves of external cavity walls.
- External and internal walls below ground (3.6 N/mm² blocks can be used in both inner leaf and internal walls; 7.3 N/mm² blocks to other locations).
- Internal walls below ground, such as the inner leaf of external cavity walls and interior walls.
The blocks can accommodate drylining, dense plaster, finishing coats and external rendering. Consult manufacturer for further finish recommendations.
General purpose, lightweight concrete blocks, suitable for walling applications.
The blocks are dark grey in colour with an opened textured surface. Available in 100 and 140 mm widths, solid form only.
Features and benefits:
- Provides a high level of thermal insulation, reducing the amount of additional insulation required after installation.
- Lightweight, easy to handle, and quick to lay.
- Loadbearing.
- Provides a high level of fire protection.
- For use internally and externally, above and below ground.
- Provides a strong background for direct application of plasters and renders (no bonding agents required).
- The clay aggregate is bloated through heat expansion to create a low density, porous surface with numerous cavities.
- Fixings will be held securely by the block (and can be nailed in directly).
- Credits available under BREAAM and Code for Sustainable Homes.
- CE marked to BS EN 771-3.
- Can be used to satisfy the requirements of Part L of the Building Regulations.
The mortar type for work above ground level should be designation (iii) / Compressive Class M4. Stronger mixes may be used only with the permission of the designer. Stronger mixes may also be required for work below ground in accordance with PD 6697. Consult manufacturer for details.
Movement joints should be considered in accordance with PD 6697 at approximately 6 m spacings. In areas of concentrated stress, such as those above and below openings, consideration should be given to the use of bed joint masonry reinforcement.
The design of walls should be in accordance with relevant design standards including BS 8103: 2, BS EN 1996-1-1 and the requirements of the Building Regulations.
Application:
For use in housing or extension projects. It can also be used to construct walls in other buildings where there is a requirement to specify blockwork with a low weight, e.g. partition walls on floor slabs. Can be considered for use in the following locations:
- Inner and outer leaves of external cavity walls.
- External and internal walls below ground (3.6 N/mm² blocks can be used in both inner leaf and internal walls; 7.3 N/mm² blocks to other locations).
- Internal walls below ground, such as the inner leaf of external cavity walls and interior walls.
The blocks can accommodate drylining, dense plaster, finishing coats and external rendering. Consult manufacturer for further finish recommendations.
| Color | Dark Grey |
| Features | High thermal insulation reducing the amount of added insulation required to comply with energy efficiency standards, lightweight, high level of fire protection |
| Finish | Open textured surface |
| Material | Aggregate concrete |
| Shape | Rectangular |
| Size | 440 x 215 x 100 mm440 x 215 x 140 mm |
| Uniclass 2015 | Aggregate concrete blocks (Pr_20_93_52_01) |
| Product Reference | Fibo 850 Concrete Blocks |
| Standard | BSI Kitemark approved to BS EN 771-3 |
| Block description | Lightweight, loadbearing unit for general purpose walling applications |
| Appearance | Open textured surface for applying plaster and render |
| Configuration | Group 1 |
| CompressiveStrength | - |
| Compressive strength (mean value) | 3.6 N/mm² |
| Category | M4 |
| ThermalConductivity | 0.25 W/m·K at 3% moisture content (internal use), 0.28 W/m·K at 5% moisture content (external use) |
| Thermal resistance | At 3% moisture content: 100 mm width: 0.40 m²K/W, 140 mm width: 0.56 m²K/W. At 5% moisture content: 100 mm width: 0.35 m²K/W, 140 mm width: 0.50 m²K/W |
| Recycled content | Up to 22% |
| Tolerance category | D1 |
| Density | - |
| Net dry density | 850 kg/m³ |
| Reaction to fire | Class A1 |
| Water vapour permeability | 5/15 µ |
| Work sizes (length x width x height) | 440 x 100 x 215 mmUnit weight: 8.7 kg. 440 x 140 x 215 mmUnit weight: 12.2 kg. |
| Moisture movement | <0.5 mm/m |
| SpecificHeatCapacity | 1000 J/kg/K |
| Sound reduction index | At 100 mm width: 40–42 RW dB (dependent on application); at 140 mm width: 42–44 RW dB (dependent on application) |
| Fire resistance | 100 mm: 2–3 hours; 140 mm: 3–4 hours |
| Standard product features | Colour: Dark grey. Features: High thermal insulation, lightweight, Class A1 high level of fire protection. Finish: Open textured. Material: Concrete (expanded clay aggregates and other naturally occurring raw materials and cement). Shape: Rectangular block. Size: 440 x 100/ 140 x 215 mm. Recyclability: 100%. |
| Recyclability | 100% |
| Recycled content | Up to 22% |
| Platform | Compatible | Version | Certified to |
|---|---|---|---|
 Revit | Revit 2016 | 4 | 2.0 |
 IFC | IFC2X3 | 3 | 1.3 |