Anhydrite screeds are a popular choice in Essex and across the UK due to their high-quality finish, speedy installation, and efficiency on underfloor heating systems. But there is a concealed danger behind these advantages: ettringite formation. If left unchecked, this reaction can destroy the floor’s stability and lead to expensive repairs. At UK Screeds Ltd., we inform clients of the issue and how to avoid it happening in the first instance.
What Exactly Is Ettringite Formation?
Ettringite is a mineral that forms when anhydrite screed sulphates react with cement-bound materials, usually adhesives or levelling compounds. When water is present, this reaction is sped up, forming crystals that thrust upwards under the floor. These crystals, with time, can force coverings up, resulting in cracking, lifting, or total failure of the flooring system. Since it begins below ground level, the harm may be out of sight until it is too bad.
Why Moisture Is the Trigger
Dampness is the primary cause of ettringite formation. If a screed of anhydrite is not completely dry, it still contains water that can trigger the reaction when a cement-based product is added. This is why thorough moisture testing is essential prior to the installation of any coverings. Here at UK Screeds Ltd., we never proceed until anhydrite screed in Essex has been tested dry to the necessary standard. Omitting this stage jeopardises the long-term integrity of the floor as a whole.
Surface Preparation That Prevents Issues Early
Drying in isolation is not sufficient. Anhydrite screeds develop a surface laitance layer, which needs to be mechanically stripped away prior to application of adhesives or compounds. If neglected, the weak layer can hold in water and stop a proper bond. After laitance has been removed, primers are applied to achieve a stable barrier between the finishing products and the screed. Cumulatively, these procedures remove the circumstances in which ettringite may form.
How We Protect Projects in Essex
We have long-standing experience working with anhydrite screed in Essex, from domestic construction through to challenging commercial installations. Whatever the type of project, there is always a need for careful management of drying times, laitance removal, and sealing of surfaces. With a tried-and-tested procedure in place, we shield floors from the hidden risk of ettringite, allowing clients to be sure that their investment will pay off.
Contact Us to Build Floors That Last Ettringite development can be concealed, yet the harm caused by it is all too real. With proper preparation, it can be eliminated altogether. Leave it to UK Screeds Ltd. to provide installations that are expertly controlled at each stage. For professional advice and anhydrite screed installation in Essex, call our staff today.
nhancedigital@gmail.com
October 27, 2025
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