This website uses cookies to ensure that we give you the best experience on our website.
By continuing to browse the site you are agreeing to our use of cookies. To find out more click here

Weber Saint-Gobain - Official website of the company

weberfloor 4150 fine flow

weberfloor 4150 fine flow
weberfloor 4150 fine flow

Product Benefits

For levelling solid bonded substrates:

• Concrete

• Sand/ cement screeds

• Anhydrite screeds

• Final wearing layer for weberfloor base or renovation screeds

Self-smoothing thin topping screed

  • Domestic & Commercial areas
  • Suitable for solid bonded substrates
  • Ideal for receiving Vinyl, Linoleum & Carpet

Product Features

About this Product

weberfloor 4150 fine flow is a pump or hand applied, self-smoothing thin topping screed for floors, which gives a strong surface layer for early floor covering. The product is formulated from special cements, aggregates, supplementary binders and chemical admixtures.

weberfloor 4150 fine flow is designed for use in residential and commercial areas allowing a much earlier overlay compared to traditional sand/ cement, concrete or anhydrite screeds. It provides a smooth and strong finish ideal for receiving a range of final floor coverings.

Features and Benefits

• For application depths between 2-30mm

• Pump or hand applied

• Foot traffic after 2-4 hours

• Final floor covering installed after 1-3 weeks in normal conditions

• Excellent spreading and smoothing characteristics

• Low alkalinity

• Casein-free

• Low emissions

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


Send or download the documents

You can either send the documents to an email address, or download it

Preparation & Application


The surface strength of the substrate must be greater than 1N/mm2

It is essential the substrate is suitably prepared and primed with weberfloor 4716 primer prior to installing the Weber floor screed.

The substrate should be clean, free from dust, grease and other impurities that might prevent adhesion.

Walls and any upstands (pillars, columns etc) should be isolated with 10 x 100mm foam.

Large irregularities in the substrate (>30m) should be filled in with a application of weberfloor 4360 base flow rapid, this should be allowed to harden and then primed before application of weberfloor 4150 fine flow can begin.

Holes and leaks in the substrate should be sealed. The substrate should be vacuum cleaned, prepared and primed with weberfloor 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 dewatering 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.


weberfloor 4150 fine flow is mixed with clean water using an automatic screed mixer approved by Weber.

The material is mixed with 20% water, which corresponds to 5.0 litres per 25kg bag. It is important to add only the specified amount of water as excess water will reduce strength, increase shrinkage and encourage segregation. Whilst mixing, the water content should be checked continuously by the flow ring test to ensure that the material is correctly mixed and free from separation and lumps of powder. The flow rate should be between 240-255mm. Conversely, reduced water content increases viscosity. The temperature of the mix should ideally be between +15°C and +20°C.

For manual mixing thoroughly mix with using a slow speed electric mixer (500 rpm) for at least two minutes. Allow to stand for 2 minutes.


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. weberfloor 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 serrated spatula or spike roller should be used to assist the self-levelling process.


weberfloor 4150 fine flow is compatible with most common floor finishes and adhesives.

It 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 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.

Packaging, Health & Safety


weberfloor 4150 fine flow is packed in 25kg polythene-lined paper sacks

Storage and Shelf Life

When stored unopened in a cool, dry place at temperatures above 5°C, shelf life is 12 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.