Calcium sulphate screed, formerly also known as anhydrite screed (AE), consists of sand/gravel (grain size up to 8 mm), calcium sulphate as a binder and water. It does not bowl or crack when drying, resulting in particularly flat surfaces that are also particularly suitable for large-format tiles. Joints only need to be arranged for large and very elongated screed surfaces (e.g. in longer corridors) or for L- or U-shaped surfaces. However, building joints must be incorporated into the screed pane, as with any other screed.
Source: bauwion
Calcium sulphate forms gypsum when combined with water. Together with the carrier material limestone or quartz sand, it forms the anhydrite screed.
Depending on the composition of the screed, the distribution is carried out solely by flowing. If this is not possible, special coating tools are used.
Screed can also be laid floating in composite form.
In wet rooms, calcium sulphate screed must be sealed against moisture and water contact.
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