Better air quality and free of moisture damage

When two adjacent residential buildings in Ludwigshafen were fully renovated in 2005/2006, energyefficiency was a focal point from the very beginning. One of the two buildings was so completelyrenovated using Passive House components that it now nearly meets the Passive House Standard for new buildings. The air-tightness of n50 = 0.46 h-1 is excellent. Measurements confirm that therenovation was a complete success. Not only has energy consumption come down to a very low level, but air quality is markedly good, as is resistance to moisture damage. The advantages of a controlled mechanical ventilation system were clearly demonstrated by the better air quality, compared to the identical neighbouring building, which was renovated to the German low-energy Standard, NEH (without ventilation systems).