Porotherm 25 AKU block is intended for the construction of inter-apartment walls. Due to its massiveness (hollow blocks should be filled with traditional cement-lime mortar), the wall has the best sound insulation in the Porotherm system, regardless of whether it is plastered or not. The walls made in this way far exceed the requirements of the standards for inter-apartment walls in multi-family and single-family housing, both in terraced and semi-detached houses.