To ensure a reliable bond when installing a Topcem Pronto bonded engineered screed, Topcem Pronto Slurry creates the critical interface on concrete substrates. It is formulated for both indoor and outdoor use to secure the screed layer directly to the prepared base.
Topcem Pronto Slurry acts as a wet-on-wet bonding bridge. Mixed with either Planicrete and water or Planicrete SP latex additive, it forms a highly cohesive slurry that must be applied directly to the concrete. The screed is then spread immediately over the wet slurry. This fresh-on-fresh technique ensures the physical integration of the screed to the concrete base, preventing cold joints, delamination, and hollow spots under traffic.
Apply to structurally sound, clean, and dry concrete substrates. The concrete must be free of dust, oil, grease, paint, curing agents, primers, or any substance that inhibits adhesion. All loosely bonded toppings or debris must be completely removed by mechanical means such as shotblasting, scarification, or diamond grinding before application.
For application using a trowel, spread and gauge the slurry thickness using a 6 x 6 mm square notched trowel. Alternatively, apply a continuous and even 2 mm to 3 mm layer using a large flat brush or scrubbing brush. Topcem Pronto screed must be spread onto the slurry while the slurry is still fresh.
Mix the slurry thoroughly to a homogeneous, smooth consistency using one of the following ratios by weight:
Apply Mapei Topcem Pronto Slurry as a 2–3 mm wet-on-wet bonding layer. Install the screed while the slurry is still fresh to ensure full adhesion and prevent delamination.
Yes, Topcem Pronto Slurry is suitable for both indoor and outdoor applications. It provides reliable bonding across different environmental conditions when applied to a properly prepared substrate.
If Topcem Pronto Slurry dries before screed application, the bonding performance will be compromised. Always apply the screed wet-on-wet to ensure the bond forms correctly and to avoid rework.
Substrates must be clean, dry, structurally sound, and free from contaminants like oil or curing compounds. Ensure compliance with current Australian Standards to achieve proper adhesion.
| Application | Key benefit | Primary trades |
|---|---|---|
| Bonding screeds to concrete slabs | Ensures full adhesion and prevents screed delamination, even under heavy loads. | Floor preparation contractors, Tilers |
| Screed bonding in internal and external areas | Provides reliable performance across varied environmental conditions, maintaining bond integrity. | Builders, Landscapers |
| Critical bond for tiled floor systems | Creates a stable, integral base for subsequent tiling, reducing risk of tile failure due to screed movement. | Tilers, Specifiers |
Prepare substrate to ensure strong adhesion and compliance.
Wear appropriate gloves and eye protection to prevent skin and eye contact during handling and application.
Ensure adequate ventilation in the work area during application to minimise exposure.
Store in original sealed packaging in a cool, dry place. Product has a shelf life of 12 months. Dispose of contents and container according to local regulations.
Correct substrate preparation is critical for Mapei Topcem Pronto Slurry to form a lasting bond and prevent screed delamination.
Surface prep: Ensure the surface is structurally sound, clean, and dry. Remove all contaminants such as oil, grease, or curing compounds. Mechanically prepare the concrete using grinding or shot blasting until a sound, open surface is achieved.
Primer: Not required. Ensure the substrate complies with Australian Standards and has no signs of rising damp before applying the slurry.
| Property | Value |
|---|---|
| Base Chemistry | Cementitious slurry |
| Application Thickness | 2–3 mm |
| Coverage Rate | 2–2.5 kg/m² |
| Application Temperature | +5°C to +35°C |
| Packaging | 20 kg bags |
| Shelf Life | 12 months |
Here are some common examples on where Mapei Topcem Pronto Slurry used by our customers.
