Screed is the term used for the subfloor of a floor. It is used to support floor coverings and represents an independent component. However, screeds are not only the necessary basis for laying floor coverings, but also fulfil tasks for sound insulation, thermal insulation, heating of rooms and the provision of installation levels, depending on the construction structure. Because they are used by people walking on them, driving over them and placing furniture, etc., they are one of the most heavily stressed building components in buildings.

The screed types differ in the binder and the type of installation. It is supplemented by aggregate, water, additives and admixtures.
Based on the binder, screed layers distinguish between five different types of screed:

• Cement screed; usually mixed at the construction site, installed moist from the earth and smoothed by hand or machine.
• Mastic asphalt screeds; are transported from the asphalt mixing plant to the construction site at a temperature of around 200-230 °C in heat-insulated agitator vessels, carried to the construction site by hand in containers and laid there by hand.
  Sand is sprinkled into the still hot surface so that floor coverings can be laid on it.
• Calcium sulphate screed / anhydrite screed; are computer-controlled and quality-monitored in manufacturing plants. They are delivered to the construction site as dry mortar in silos or bags, as a mixture in a Mixmobil or as ready-mixed mortar in a truck mixer.
  The flowable mortar is pumped onto the prepared substrate, where it largely levels itself and is de-aerated and levelled using buffing bars.
• Synthetic resin screed; the binder is a synthetic resin, such as epoxy resin or polyurethane, to which quartz sand is added as an aggregate. The synthetic resin screed is usually laid in a bond, i.e. it is firmly bonded to the subfloor.

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