In sandwich walls, external, inside which the thermal insulation layer is located, it is necessary to provide lintels of small thickness. Depending on the thickness of the façade and load-bearing wall, we set a different number of lintel beams, separating them with a layer of thermal insulation. Covering the lintel with four lintel beams in the wall made of Wienerberger Porotherm hollow bricks is very simple. The beams themselves are also a product of this company that is part of the entire system.