Brief remarks regarding the properties

The properties of our building materials with regard to noise, fire, heat protection and load capacity

For apartment construction in particular the light-weight, highly thermally insulating KLB wall materials are suited to building monolithic walls for low energy houses according to EnEV 2009, energy efficient houses KfW-70, KfW-55, KfW-40 as well as passive houses. However, the heavier KLB light-weight concrete blocks also achieve the required values with appropriate additional insulation.

Since the energy-saving ordinance EnEV 2002 went into effect, low-energy houses are part of the standard. In 2009 the newly updated EnergySavingOrdinance, abbreviated EnEV 2009, was introduced. Only standards in the area of low-energy and passive houses are supported.

This requires U-values ≤ 0.35 W/m²K (Reference building EnEV 2009: U-value ≤ 0.28 W/m²K) for the exterior walls of low-energy, KfW-70, KfW-55 and KfW-40 houses.

The walls of passive houses must be, if needed equipped with appropriate additional insulation, achieve a U-value of (Reference KfW support standard) ≤ 0.15 W/m²K.


Product range

The masonry product range of KLB is divided into


  • approved flat blocks for processing with thin-bed joint
  • approved and standardised climate light-weight blocks for pro-cessing with thick-bed joint
  • plus a respectively coordinated supplementary range
Heat protection

With the KLB plan blocks and KLB aerated lightweight blocks, in particular with the new KLB plan blocks with integrated insulation, the thermal insulation blocks SW1 and thermal insulated blocks W3 the requirements for the current Energy Savings Ordinance EnEV are fulfilled. They guarantee comfortable living in dry, healthy premises. KLB offers economical and energy-saving construction and contributes to environmental relief via lower energy consumption.

More information about heat protection can be found here

Sound insulation

Noise emissions are hazards to be taken seriously, and which impact people’s psyche. With KLB wall-building materials the outside noise, as well as the noise from third party or your own living and work areas, can be sustainably reduced. With KLB products, house separation walls, apartment separation walls and stairwell walls can be built in a manner definitely and effectively reducing noises.

More information about Sound insulation can be found here


Load-bearing capacity

In structure planning, the quality of the masonry and costs of the shell construction are influenced considerably. KLB wall building materials with strength classes from 2 to 20 allow differentiated adjustment to the different building requirements with large design leeway and without mixed construction methods. In practice, block strengths that are too high are often dictated due to lack of knowledge. This inevitably results in an unnecessary loss of thermal insulation. The compressive stress of the masonry and not just the block strength class is decisive for the load capacity. The structural engineer may today no longer simply transfer DIN values, because almost all wall building materials, regardless whether light-weight concrete, brick, sand-lime or aerated concrete, have their own approvals. These list base values of the permitted compressive stresses, as they can often deviate from the DIN values significantly downward.

More information about Load-bearing capacity can be found here


Fire protection

KLB wall building materials are not flammable and belong to building material class A1. In case of a fire there is no carbonisation and no emissions due to KLB masonry. KLB wall building materials comply with fire resistance class F 180-A as load-bearing, space-enclosing walls when they are plastered and >17.5 cm thick, or as non-load-bearing , space-enclosing walls when they are also plastered and at least 11.5 cm thick. Fire walls made of KLB blocks can usually be built out of plastered walls of block gross density > 0.6 kg/dm³ if they are single shell > 24 cm or double shell 2 x > 17.5 cm thick. KLB products safely protect people and animals as well as their possessions. Property insurance companies reward this via lower premiums.

 More information about fire protection can be found here