Evalast
Dense concrete blocks that can be used in virtually any part of the project in normal conditions. Evalast blocks' excellent sound insulation and high strength makes them especially applicable to partition and separating walls. They can also be used as infill blocks in beam and block flooring systems.
Acoustics The high density of Evalast Background blocks gives them excellent sound insulation properties. When laid to form a sound separating wall, they achieve the required mass as given in the Building Regulations and Robust Details.
Flooring Evalast Background blocks are suitable as infill blocks for beam and block flooring systems. They should be specified as ‘for flooring’, in order that the correct manufacturing base is sourced.
Strength
Having high density, with associated strengths, Evalast Background blocks easily achieve the durability requirements for use above and below ground. They can be used in normal and sulphate soil conditions equivalent to classification DS-3.
Thermal Evalast Background blocks, in conjunction with suitable thicknesses of insulation, are able to provide high levels of thermal insulation.
Fire
Concrete is an excellent fire resistant material. Evalast Background products are manufactured from either Class 1 (limestone) or Class 2 (gravel and crushed stone) aggregates. Where fire resistance is important it is essential that the class of aggregate is specified.
Easilift
Evalast Easilift blocks are available as easier to use versions of the 140mm Evalast Background blocks. This means they benefit from all of the usual Evalast properties whilst weighing less than 20kg thus meeting manual handling guidelines.
Material properties
Mean compressive strength:
Solid: 7.3, 10.4, 17.5, 22.5 N/mm²
100 Coursing unit: 10.4 N/mm²
140 Coursing unit: 10.4 N/mm²
Thermal conductivity (W/m.K): internal 1.32, external 1.42
Dry density: 1990 kg/m³
Working dimensions:
Standard: 440 x 215mm
140mm Easilift: 290 x 215mm
103mm coursing unit: 215 x 65mm
140mm coursing unit: 215 x 65mm
Block widths and weights (for 440 x 215)
Block widths (mm) |
Form |
Block weight*(kg) |
Wall weight**(kg/m²) |
100 |
Solid |
19.4 |
204 |
140 |
Solid |
27.1 |
285 |
| 215 |
Hollow |
24.5 |
268 |
215 x 65 x 100 |
Coursing |
2.9 |
207 |
| 440 x 65 x 140 |
Coursing |
8.0 |
283 |
*Block weights are calculated using specified dry density, with a moisture content of 3% by weight added to provide the equilibrium value.
**Weight of erected wall (including mortar). Add 11 kg/m² per side for a 2-coat lightweight plaster finish (24 kg/m² for dense plaster).