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Mapei Topcem Pronto Slurry is a dedicated bonding slurry for securing compatible Topcem Pronto screeds to properly prepared concrete substrates. In a bonded screed build-up, the interface beneath the screed matters: this product creates the prescribed fresh bond coat before the screed mortar is placed.
Designed for bonded Topcem screeds
Use it where the selected Mapei Topcem Pronto system calls for a slurry coat between a sound concrete base and the new screed. It offers a purpose-made alternative to batching a separate bonding slurry from individual ingredients, helping crews keep preparation consistent across the area.
Slurry is not a screed
Topcem Pronto Slurry is the bonding layer, not the material used to construct the screed itself. It also differs from Planicrete SP, which is a latex additive used in specified site-mixed bonding slurries. Match the bond coat to the chosen screed system.
The critical first layer in a bonded screed
When Topcem Pronto is specified as a bonded screed over concrete, the crew needs more than the screed mortar itself. Topcem Pronto Slurry creates the required interface, applied to the properly prepared concrete immediately ahead of the screed. It helps the contractor work through the floor systematically without treating adhesion as an afterthought.
The practical benefit is a purpose-made bonding material within the Topcem Pronto system, instead of improvising a slurry from unrelated products. Apply and cover it within the stated wet-on-wet procedure; a coat allowed to dry before screeding may not deliver the intended bond. It is not a standalone floor covering, repair grout or levelling compound.
Before installation
Prepare concrete thoroughly and apply the screed into the fresh slurry within the specified wet-on-wet window. Never leave the bond coat to dry before covering unless the applicable system expressly permits it.
What is Topcem Pronto Slurry used for?
It is the bonding slurry used beneath bonded Topcem Pronto engineered screeds.
How thick should the slurry be?
Apply a continuous layer about 2 to 3mm thick.
What is the mixing ratio?
Use 3 parts slurry with 2 parts Planicrete SP, or 3 parts slurry with 1 part Planicrete and 1 part water.
Can the slurry dry before the screed is placed?
No. Topcem Pronto must be installed fresh-on-fresh.
- Prepared concrete substrates.
- Existing ceramic or stone floors where the complete Topcem Pronto system permits bonded screed installation.
Mapei Topcem Pronto Slurry Physical Properties
| 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 |
| Shelf Life | 12 months |