About this product
weber.floor 4150 fine flow is a pump applied floor screed formulated from special cements, aggregates, supplementary binders and chemical admixtures.
It is supplied as a pre-blended dry powder designed for application at a thickness of between 4 - 30mm (Per normal concrete). The product is casein free.
Field of application
▲ Manufactured under a BSI Quality Assurance Scheme ISO 9001
▲ Excellent spreading and smoothing characteristics
▲ Low alkalinity
▲ Casein-free
▲ Low emissions
Technical data
Constraints
Not to be used where some movement is expected (e.g. underfloor heating). Do not use:
on permanently damp floors or floors with rising damp;
on friable or unstable floors;
in industrial areas;
on exterior floors.
Preparation
Substrate
Suitable substrates are concrete and lightweight-concrete. The surface strength of the substrate must be greater than 1N/mm².
Preparation and priming
The substrate should be clean, free from dust, grease and other impurities that might prevent adhesion. Holes and leaks in the substrate should be sealed. Floor drains etc. should be protected and large irregularities (>30 mm) should be filled. The infil should be left to set before the next application. The substrate should be vacuum cleaned, prepared and primed with weber.floor 4716 primer according to the instructions on the data sheet. Priming improves the screed’s adhesion to the substrate and prevents the formation of air bubbles and de-watering of the screed. Priming also improves the flow properties of the screed. Dry and very porous substrates (cast-in-situ concrete floors) may need to be treated twice. If the screed is applied in more than one layer, each layer must be primed.
Mixing
weber.floor 4150 fine flow is mixed with clean water using an automatic screed mixer approved by Weber. For manual mixing the screed should be mixed with a suitable paddle mixer for at least 2 minutes.
The suitable water amount is 20% (of the powder’s dry weight), which corresponds to 5 litres/25 kg bag. Pot-life is 20 min. from mixing with water. The temperature of the screed must be at least +10°C. The flow properties of the screed should be checked by using a weber.floor 4931 flow ring and plate before and regularly during pumping. Excess water causes separation and weakens the strength of the screed surface.
Application
Light ventilation in the working area is necessary but windows and door openings must be closed sufficiently to avoid draughts during and for 3 days after application. During application, and for at least 1 week afterwards, the substrate and ambient temperature should not fall below +10°C or rise above +25°C. The relative humidity of the substrate must be <95%.
To achieve the best finish, the floor area should be divided into bays of 6 to 8 metres depending on pump capacity and application thickness. weber.floor 4965 barrier foam should be used to form bays and stop ends. Pumping is carried out in sections so that a new section is pumped as quickly as possible and to maintain a wet edge. A wide spatula or spike roller should be used to assist the self-levelling process.
Overlay
weber.floor 4150 fine flow is compatible with most common floor finishes and adhesives.
weber.floor 4150 fine flow should not be painted or used without a floor finish.
Drying time
The screed can receive foot traffic after a drying time of 2 – 4 hours at an ambient temperature of +20°C. If necessary, the surface can be ground or smoothed over with weber.floor 4031 super flow after 2 days following application. Floor covering can be installed after 1 – 3 weeks depending on layer thickness and drying conditions.
High humidity of the substrate and poor drying conditions prolong the setting time.
Storage and Shelf life
When stored unopened in a cool, dry place at temperatures above 5°C, shelf life is 6 months from date of manufacture.
Poor storage conditions may have an adverse impact on the levelling properties.
Health and Safety
Contains cement (Contains chromium (VI). May produce an allergic reaction). Harmful by inhalation. Irritating to eyes and skin. Keep out of the reach of children. In case of contact with eyes, rinse immediately with plenty of water and seek medical help. After contact with skin, wash immediately with plenty of soap and water. Wear suitable protective clothing, gloves and eye/face protection.
Technical services
Weber's Customer Services Department has a team of experienced advisors available to provide on-site advice both at the specification stage and during application. Detailed specifications can be provided for specific projects or more general works. Site visits and on-site demonstrations can be arranged on request.
Technical helpline
Tel: (01525) 722110
Fax: (01525) 718988
Sales Contact
Weber products are distributed throughout the UK through selected stockists and distributors. For UK sales enquiries and overseas projects, contact Weber's Sales office.
England & Wales Sales office
Tel: 08703 330070 (press 1 for sales)
Fax: (01525) 718988
Scotland, Northern Ireland, Isle of Man, Republic of Ireland Sales office
Tel: 028 9335 2999
Fax: 028 9332 3232
