Description Product Overview Mapei Topcem Pronto AU is a pre-blended, ready-to-use screed mortar formulated with special hydraulic binders and graded aggregates to produce fast-drying, controlled-shrinkage screeds. Designed to simplify installation, it only requires the addition of water, eliminating the need for on-site batching of sand and cement while ensuring consistent performance and quality. Topcem Pronto AU develops high mechanical strength and dries significantly faster than traditional screeds, allowing earlier installation of floor coverings and reducing project timelines. Its high thermal conductivity also makes it ideal for use with underfloor heating systems, ensuring efficient heat transfer through the screed. Key Features Ready-to-use – just add water Fast drying – ready for coverings in as little as 24 hours (tiles) Controlled shrinkage – reduces risk of cracking High compressive and flexural strength Suitable for bonded, unbonded, and floating screeds High thermal conductivity – ideal for heated screeds Consistent performance without site batching Applications Formation of bonded, unbonded, and floating screeds Internal and external floor screeds Substrates prior to installation of tiles, timber, vinyl, and carpet Heated screed systems (underfloor heating) Fast-track projects requiring rapid drying times Repairing or reinstating screeds in renovation work Notes Mix one 20–25kg bag with approx. 1.4–1.7 litres of clean water Workability time approximately 40–60 minutes Apply, compact, and level using traditional screeding methods Set to light foot traffic after approximately 12 hours Allow minimum 24 hours before installing ceramic tiles Allow 2 days for stone and waterproofing membranes Allow approx. 4 days before installing timber and resilient flooring Technical Information Specification Details Product Type Pre-blended fast-drying screed mortar Mixing Ratio Approx. 1.4–1.7 L water per 20–25 kg bag Workability Time 40–60 minutes Foot Traffic Approx. 12 hours Ready for Tiles 24 hours Ready for Stone 2 days Ready for Timber/Resilient Approx. 4 days Residual Moisture < 2% after 4 days Consumption 18–20 kg/m² per cm thickness Thermal Conductivity Approx. 2.0 W/m·K Packaging 20kg bag
