The building requirements concerning fire protection and room acoustics often require separate mounted sub-ceilings. Currently used sub-ceilings often contain separate parts for the fire protection and the acoustic customisation. Newly developed structures made of textile-reinforced concrete and lightweight aggregate concrete combine these two functions in one prefabricated element. Beside the thermal insulation and the noise absorption of these elements, the static behaviour and the lightweight potential were investigated. The open-pored lightweight concrete reduces the temperatures at the textile-reinforced concrete layer and helps to reduce the reverberation time of the room. It was figured out, that the usage of elements with an S-shaped cross section produces the best results. These elements create air chambers, which provide further heat and noise absorption in addition to the lightweight aggregate concrete itself. The acoustical behaviour of different concrete mixtures was analyzed by measuring the absorption coefficient in an impedance tube and in a reverberation chamber.