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The choice of screed depends on factors like drying time, load requirements, and the type of final floor covering. For fast-track projects, fast-drying screeds are ideal, while self-levelling screeds work best for uneven subfloors. Fibre-reinforced screeds add strength and minimise cracking, making them suitable for high-traffic areas. Anhydrite screeds offer excellent flowability and are great for large-scale commercial applications.
Drying times vary depending on the type of screed. Traditional sand and cement screeds take 1mm per day up to 50mm, while fast-drying screeds can be ready for flooring in as little as 24 hours. Anhydrite screeds require longer drying times, typically 1mm per day in ideal conditions. Always check the product’s technical data sheet for specific guidance.
Yes, many screeds are designed to be compatible with underfloor heating. Self-levelling and anhydrite screeds are particularly effective as they flow around heating pipes, ensuring even heat distribution. It’s important to follow the correct drying and commissioning process to prevent cracking.
The required thickness depends on the screed type and its application. Bonded screeds (adhered directly to the substrate) are typically 25-40mm, while unbonded screeds (applied over a membrane) need at least 50mm. Floating screeds used over insulation require a minimum thickness of 65mm for domestic and 75mm for commercial applications. Always refer to manufacturer guidelines.
Self-levelling screeds are flowable and spread across the floor to create a smooth surface with minimal manual work. Traditional sand and cement screeds require manual application and finishing, making them more labor-intensive but sometimes preferable for thicker applications.
Yes, in most cases, a primer is recommended to improve adhesion and reduce moisture absorption. Cement-based primers are ideal for porous substrates, while epoxy or acrylic primers work best on non-porous surfaces like tiles or dense concrete.
While screed is typically used as a subfloor, some polished or resin-coated screeds can serve as a finished surface in industrial or modern interior designs. However, they usually require sealing or additional treatments for durability and aesthetics.
Common issues include cracking, debonding, and moisture-related problems. To prevent failure:
– Use the right type of screed for the environment.
– Ensure proper curing and drying times.
– Use expansion joints in large areas to prevent shrinkage cracks.
– Apply a moisture barrier when using unbonded or floating screeds.
Yes, but preparation is key. Self-levelling screeds can be applied over concrete, tiles, or old screeds if properly primed. For weak or damaged floors, a bonding agent or primer is necessary to ensure adhesion and longevity.
