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Anhydrite screed

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Anhydrite screed

Anhydrite screed

Anhydrite Screed: Properties, Advantages, and Applications

What is Anhydrite Screed?

Anhydrite screed is a type of screed that uses calcium sulfate (anhydrite) as a binder. It is characterized by an exceptionally smooth surface, quick processing, and low shrinkage. Thanks to its excellent thermal conductivity, it is particularly suitable for underfloor heating systems.

Advantages of Anhydrite Screed

  1. Fast Processing: Anhydrite screed is easy to install and self-leveling, ensuring a smooth surface without extensive rework.
  2. Low Shrinkage: Compared to cement screed, anhydrite screed is less prone to cracking as it barely shrinks.
  3. High Thermal Conductivity: Its excellent heat conductivity makes it the ideal choice for underfloor heating, as it efficiently stores and evenly distributes heat.
  4. Lightweight: Anhydrite screed is lighter than cement screed, making it particularly interesting for renovations and lightweight construction.
  5. Eco-Friendliness: Since anhydrite is often a byproduct of industrial processes, it is a more sustainable option compared to traditional screed types.

Applications of Anhydrite Screed

Anhydrite screed is used in many areas, including:
  • Residential Spaces: Ideal for interior construction due to its smooth surface and quick installation.
  • Underfloor Heating Systems: Especially well-suited because of its high thermal conductivity and even heat distribution.
  • Offices and Commercial Spaces: Perfect for large areas due to its low shrinkage and reduced risk of cracking.
  • Renovations: Often the first choice for refurbishments and modernizations due to its lower weight.

Drying Time and Processing

The drying time of anhydrite screed depends on the layer thickness and is approximately 7–14 days until it is ready for flooring installation. Several important aspects should be considered:
  • No Water Exposure During Processing: Anhydrite screed is sensitive to moisture, making it unsuitable for permanently damp rooms or outdoor areas.
  • Proper Ventilation: To ensure optimal curing, the screed should be well-ventilated.
  • Correct Surface Treatment: Before laying flooring, priming or sanding is often necessary to improve adhesion.

Conclusion

Anhydrite screed is a versatile, eco-friendly, and easy-to-process screed type, particularly suitable for interior spaces and underfloor heating systems. Due to its low shrinkage and high thermal conductivity, it is an excellent alternative to cement screed.
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