UZIN NC 167 is a hydraulically setting, self-leveling flowing screed for layer thicknesses of 3 to 40 mm. The product can be applied as a bonded flowing screed or used as an unbonded screed on a suitable separation layer.
Thanks to its excellent flow properties, UZIN NC 167 can be easily distributed over large areas and pumped mechanically. Once dry, it forms a level, low-stress, highly absorbent surface for textile and resilient floor coverings, ceramic tiles, and natural stone.
The flowing screed can also be used to embed suitable thin hot-water and electric underfloor heating systems.
Key properties
- Self-leveling cement-based flowing screed
- Suitable for layer thicknesses of 3 to 40 mm
- Suitable as a bonded flowing screed
- Suitable for application on an appropriate separation layer
- Excellent flow properties
- Suitable for manual application and pumping
- Low-stress curing
- Highly absorbent surface
- High load-bearing capacity
- Suitable for embedding underfloor heating
- Working time of approximately 20 to 40 minutes
- Walkable after approximately 2 to 4 hours
- Suitable for residential and commercial projects
- For indoor use
The stated times apply at approximately 20 °C and a relative humidity of 65%. Temperature, humidity, substrate, and layer thickness may affect the drying time.
Applications
UZIN NC 167 can be used for:
- Creating a bonded flowing screed
- Creating an unbonded flowing screed on a separation layer
- Leveling larger height differences
- Creating a level substrate for floor coverings
- Embedding thin hot-water underfloor heating systems
- Embedding suitable electric underfloor heating systems
- Large areas that are pumped mechanically
The product is not automatically suitable for filling milled floor heating pipes. A specific UZIN system recommendation must be followed for this purpose.
Suitable floor finishes
UZIN NC 167 can be used as a substrate for, among other things:
- PVC and LVT
- Vinyl
- Linoleum
- Rubber
- Carpet and other textile floor coverings
- Resilient floor coverings
- Ceramic tiles
- Natural stone
The floor is suitable for normal loads in residential and commercial areas and for loads from castors in accordance with DIN EN 12529.
Suitable substrates
UZIN NC 167 can be applied as a bonded system, in combination with the correct preparation and primer, to:
- Cement screeds
- Concrete
- Suitable cement-based renovation substrates
For gypsum-based, calcium sulphate-based and anhydrite screeds, UZIN recommends a suitable calcium sulphate-based solution, such as UZIN NC 567 or UZIN NC 587, depending on the required floor structure and drying time.
Minimum layer thicknesses
- Bonded application: minimum 3 mm
- On a separating layer: minimum 25 mm
- Maximum layer thickness: 40 mm
For unbonded floor constructions, the complete floor structure must be assessed technically in advance.
Substrate preparation
The substrate must be load-bearing, stable, dry and free of cracks, dust, dirt, oil and grease.
For bonded applications, remove all poorly bonded and adhesion-reducing layers by brushing, sanding, milling or dust-free shot blasting. Remove loose material and vacuum the surface thoroughly.
Then apply a suitable UZIN primer and allow it to dry completely. For layer thicknesses exceeding 10 mm, an epoxy primer such as UZIN PE 460, fully broadcast with suitable UZIN quartz sand, may be required.
When applying over a separating layer, the load-bearing substrate must be clean and free of loose material. Install suitable edge insulation strips along all rising building elements. Lay the separating film flat, without creases, and with sufficient overlap.
Mixing and application
Pour 3.6 to 4 litres of clean, cold water into a clean mixing tub. Then gradually add the entire contents of the 20 kg bag while mixing.
Mix the material mechanically with a suitable basket mixer until a fluid, homogeneous, lump-free mixture is obtained.
Pour the material onto the substrate and spread it evenly using a smoothing trowel, squeegee or floor scraper. If necessary, use a spiked or deaeration roller to remove trapped air and improve the surface.
UZIN NC 167 is suitable for machine pumping. Preferably apply the desired layer thickness in a single operation.
Consumption
Average consumption is approximately 1.7 kg per m² per millimetre of layer thickness.
| Layer thickness | Consumption | Area per 20 kg bag |
|---|---|---|
| 3 mm | approximately 5.1 kg/m² | approximately 3.9 m² |
| 5 mm | approximately 8.5 kg/m² | approximately 2.4 m² |
| 10 mm | approximately 17 kg/m² | approximately 1.2 m² |
| 25 mm | approximately 42.5 kg/m² | approximately 0.47 m² |
| 40 mm | approximately 68 kg/m² | approximately 0.29 m² |
Actual consumption depends on the layer thickness, evenness of the substrate and selected floor construction.
Drying time
| Application | Indicative drying time |
|---|---|
| Walkable | after approximately 2 to 4 hours |
| Textile and resilient floor coverings at 3 mm | approximately 24 hours |
| Thicker layers | considerably longer, depending on the total layer thickness |
As a general indication, thicker layers may require a drying time of several days for each additional 10 mm. Always check that the flow screed is sufficiently dry before bonding.
Technical data
Product type: self-levelling flow screed
Binder: cement-based and hydraulically curing
Packaging: 20 kg paper bag
Colour: dark grey
Layer thickness: 3 to 40 mm
Water quantity: 3.6 to 4 litres per bag
Consumption: approximately 1.7 kg/m² per mm of layer thickness
Working time: approximately 20 to 40 minutes
Walkable: after approximately 2 to 4 hours
Minimum floor temperature: 10 °C
Flow spread: approximately 140 mm, plus or minus 5 mm
Thermal conductivity: 1.4 W/mK
Fire rating: A1fl
Shelf life: at least 9 months
Quantity per pallet: 54 bags
Why choose UZIN NC 167?
UZIN NC 167 is suitable for flooring projects requiring greater layer thicknesses, good flow properties and a strong, absorbent substrate.
The option to apply the product bonded or over a separating layer makes it suitable for a wide range of renovation and new-build projects. Thanks to its pumpability, the flow screed can also be applied efficiently over large areas.
