Frequently Asked Questions


What is a flowing screed?

A flowing screed is selected sharp sand aggregate mixed with anhydrite binder and water.

What is anhydrite?

There are three main types of anhydrite that are used in flowing screed production.

Synthetic anhydrite: this is a bi-product of fluoric acid production.
Thermic anhydrite: this comes from flue gas desulphurization gypsum (FGD Gypsum).
Alpha hemihydrate: this can be produced from gypsum rocks or from FGD Gypsum.

How does Screedflo compare to traditional sand and cement floor screeds?

Compare it by looking at this comparison sheet.

How does Screedflo compare to ready mix concrete companies that supply flowing floor screeds?

Compare it by looking at this comparison sheet.

What can flowing screed be used for?

Flowing screed can be used for almost any internal application to provide a flat, smooth surface for all types of floor coverings, either domestic or commercial.

  • As a bonded screed it can be laid to a minimum of 25mm thickness. This is where the screed is laid directly over a solid base. This requires particular preparation of the base.
  • As an unbonded screed it can be laid to a minimum of 30mm thickness. This is where the screed is separated from the solid base with a polythene membrane /DPM.
  • As a floating screed it can be laid to a minimum thickness of 40mm. This is where the screed is separated from the solid base with an insulation layer and a polythene membrane /DPM.
  • Where the floor zone incorporates underfloor heating a minimum cover of 30mm over the pipes / cable should also be maintained.

Can flowing screeds be used with under floor heating?

Flowing screeds are ideal for application over both electric and water under floor heating systems because of the flowable consistency that fully encompasses the heating pipes. Flowing screeds have excellent thermal conductivity and minimal thermal expansion.

Do flowing screeds need reinforcement to prevent cracking?

Flowing screeds do not require reinforcement as they do not curl and shrinkage is extremely low, minimising the risk of cracking.

How much do I need?

You can get an approximate guide by using our calculator.

How do I contact Screedflo?

You can use any of the methods shown on our contact page. We'd be happy to discuss your project requirements with you.

Is my job too large/small?

Depending on location, our minimum delivery is approximately 2m³ and there is no upper limit.

Does Screedflo deliver to my area?

We operate in East Anglia, the South East, London and the Home Counties. For larger jobs outside these areas please telephone us as we may still be able to deliver to you. When supplying Screedflo as part of the Screedflo dB acoustic floor system, coverage is national.

Will the Screedflo vehicle be able to access my site?

The delivery vehicle can access most sites, but must always be on a hard standing area. We can pump the material 150 metres from wherever the Screeedflo vehicle is parked.

The physical dimensions of the vehicle are:

Screedflo delivery vehicle


Overall width: 2.5m
Overall width including mirror: 2.9m
Overall length: 16.0m
Overall height: 4m

What do I need to do before the delivery arrives?

  • Make sure that there is a safe hard standing area for the Screedflo vehicle.
  • Make sure that we have a water supply (we will bring a hose pipe with the vehicle).
  • Provide us with an area to wash out the final residue once the delivery is complete.

What happens once the delivery arrives?

Once the delivery vehicle arrives we will first make sure that you are ready to start. We will then connect the water and delivery hoses to the Screedflo vehicle and start to mix your Screedflo. After 10 minutes we will be ready to start pumping. It takes 8 minutes to pump each m³. Once we have finished mixing we will then wash out any residue and ask you to sign our delivery note.

Can I tile straight on to Screedflo?

Yes, however the surface will require priming with a primer suitable for use with an anhydrite screed.

If I have more questions who do I contact?

Contact Screedflo any time by emailing us at info@screedflo.co.uk (please ensure you include your contact details) or call us on 01621 874781.

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