If the screed surface also represents the finished floor surface, it is referred to as a utility screed. In principle, all types of screed are suitable for this purpose. Various properties can be assigned to the floor surface, e.g. increased surface hardness due to the addition of hard material to cement-bound hard screed or colour designs to solid-coloured exposed screeds. Utility screeds are widely used in industrial construction, but they are also suitable for public buildings, administrative buildings or residential buildings. High-quality surfaces can be achieved by sanding the screed surface, if necessary several times with increasingly finer grain.
According to their type of production, screeds are divided into construction site screeds and prefabricated screeds.
In contrast to precast screeds, construction site screeds are produced on site, using screed mortar - which is mixed on the construction site or delivered in the form of dry or fresh mortar - or mastic asphalt. They are designed heated or unheated and are divided into composite screeds, screeds on separation layer and floating screeds according to their structure. Construction site screeds either serve as a substrate for the final floor covering or, as a so-called useful screed, represent the finished floor surface itself.
CT - Cement screed
CTF - Cement flowing screed
SR - Synthetic resin screed
MA - Magnesia screed
CA - Calcium sulphate screed
CAF - Calcium sulphate flowing screed
AS - Mastic asphalt screed
In contrast to construction site screeds,prefabricated screeds, also known as dry screeds, are delivered to the construction site and laid as finished slabs. The elimination of the drying phase on the construction site leads to a much faster readiness for covering and no larger quantities of moisture are introduced into the building. Lower construction heights than with construction site screeds are also possible. Prefabricated screeds can also be combined with underfloor heating in some cases. As a rule, they are the substrate for the final floor covering, but there are also products that can serve as a finished floor surface themselves.
In addition to the classification of construction site screeds according to their binder according to the above table, they are also differentiated according to DIN 18560 according to their type of installation:
Screed/ Heated screed on insulation layer (floating screed) according to DIN 18560-2:
Composite
screed according to DIN 18560-3:
Screed on separation layer according to DIN 18560-4:
Source: bauwion
