Bulk density of limestone

Sand-lime brick, as the name implies, is made of sand. The binder used is calcium silicate hydrate, which forms a solid, permanent compound by means of steam hardening with the sand. In this manufacturing process, the stone can be produced with different density. During construction, attention must be paid to the gross density class RDK.

Bulk density of limestone

Sand-lime brick has a gross density of between 1,200 and 2,200 kilos per cubic meter. This range makes it necessary to clarify, before buying lime-sand bricks, whether it should be a load-bearing wall or just a non-load-bearing inner wall.

The gross density is also important in fire protection walls. The higher the gross density, ie the weight per cubic meter of wall, the more effectively the wall is suitable for fire protection.

Sound insulation and thermal conductivity

At the RDK, the skilled person can also read off the thermal conductivity of a lime-sandstone and the ability to soundproof. The higher the gross density class, the better these two aspects are of course given.

For the construction of a detached house, there are guidelines that should be followed by all construction companies, in which the RDK is given, which is part of a solid construction. In practice, therefore, at least the RDK 1.4 or better 1.8 is used.


The density of the sand-lime brick already starts at 0.6 RDK, that is about 600 kilos per cubic meter of masonry. But these low classes are rarely used. These crude density classes RDK are currently common on construction sites with the sand-lime brick:

  • 1.2 - about 1,200 kilos per cubic meter of masonry
  • 1.4 - about 1,400 kilos per cubic meter of masonry
  • 1.6 - about 1,600 kilos per cubic meter of masonry
  • 1.8 - about 1,800 kilos per cubic meter of masonry
  • 2.0 - about 2,000 kilos per cubic meter of masonry
  • 2.2 - about 2,200 kilos per cubic meter of masonry

Tips & Tricks

Inexperienced builders are likely to get low-priced offers from overly reputable construction companies offering sand-lime bricks with a gross density class of 1.2 or less. However, if possible, they should use at least an RDK of 1.8. Therefore, you should keep your fingers off such companies, because such an offer is not particularly good for trust in this company.

Video Board: dry loose bulk density of coarse aggregate