The ultimate free-flowing floor screed

It’s a common problem; time is tight yet the project requirements are many. You need a flooring solution that is both fast and flexible, one that is simple to place providing a high quality surface. Ordinary sand cement screed does not deliver the speed or the versatility. But there is an alternative that ticks all the right boxes, Topflow Screed A from Tarmac.

Topflow Screed A made with a unique synthetic anhydrite binder in place of cement is pump applied due to its fluid consistency. This means that it is easier to lay covering areas of up to 2000m2 in a day. It is thinner than conventional screeds making it the natural choice for underfloor heating systems.

Our Topflow Screed A solutions are part of our wider range of flowing screed solutions. We also offer a cement based free flowing screed – Topflow Screed C Belitex. Read more about this alternative.


  1. Fast installation

    Free flowing Topflow Screed A can be laid in areas of up to 2000m2 in just one day. It is suitable for foot traffic within 24-48 hours while partitions can be erected just seven days after placing.

  2. High strength

    Stronger than sand cement screed, Topflow Screed A requires no reinforcement and no manual compaction.

  3. Lower depths

  4. Flexible choices

    New build and renovation work. Unbonded, bonded or floating construction. Residential and commercial. With or without underfloor heating. Whatever the requirement, Topflow Screed A gives you greater project flexibility

  5. Low shrinkage

    Topflow Screed A is less prone to shrinkage than sand cement screeds and therefore requires fewer construction joints.

  6. More sustainable

    Topflow Screed A doesn’t contain any cement and has an overall recycled content of 36%.


  • For use with under floor heating
  • Unbonded, bonded or floating floor construction
  • Ideal for both new build and renovation work
  • Suitable for all residential and commercial floors carrying pedestrian traffic within BS 8204
  • Compatible with most acoustic resilient systems due to its uniformed compaction, creating 80kg/m2 at 40mm depth


Topflow Screed A The Shard

Tarmac's Topflow Screed A Sky is a blend of synthetic calcium sulphate binder, selected aggregates, special additives and clean potable water, to produce a pumpable self levelling, flowing screed manufactured to BS EN 13813:2001.


Topflow Screed A - Humberston Avenue (Thermio)

When a client refurbishing their property wanted to improve not only the quality of the finish of their floor but the overall standard of it's thermal co-efficiency too, Topflow Screed A Thermio provided the solution.


Topflow Screed A Excelio - Coed-y-brain school, Llanbradach

The floor in 2 classrooms at Coed-Y-Brain was ingressing water and a solution needed to be found.


Topflow Screed A - Downing College

When a new development of student accommodation was to be constructed, Tarmac got involved to provide a solution for the 2800m2 floor area which needed an easy screed solution.


Leamington Spa - Topflow Screed A

This 6 story building in the heart of Royal Leamington Spa was previously used as an office building and is now evolving into luxury modern apartments.


Topflow Screed A - House Renovation, Blakenhall

Whilst project managing the renovation of his property, Mr Dale was keen to appoint only skilled tradespeople to ensure works were carried out to a high standard. He contacted Tarmac to discuss various screeding options for installation over under-floor heating.


TOPFLOW SCREED A Baltimore Wharf

Because Topflow is much quicker to lay compared with more traditional alternatives, the team managed to cover an area of about 700m per day.


TOPFLOW SCREED A Kiwi care home, Derby

Topflow Screed A is made with a unique synthetic anhydrite binder in place of cement and is pump applied due to its fluid consistency. This means that it is easier to lay covering areas of up to 2000m2 in a day.


Topflow Screed A - EXCELIO Seer Construction, Brecon

Tarmac were approached by seers, looking for a screed solution for their new build project. The build had suffered from a number of re-designs during the initial build.


TOPFLOW SCREED A- Repurpose building, Manchester

The client wanted to provide a flat, stable and safe floor area that will eventually be used as a light industrial space.

How it works

Free-flowing for faster installation

Topflow Screed A is made with a recycled source of gypsum (calcium sulphate) rather than cement. It has a free-flowing fluid consistency and is applied by pump.

Floors are suitable for foot traffic within just 24-48 hours, while drying takes just 40 days, or sooner with force drying (available after only 7 days). Typical drying times are 1mm per day for depths of 40mm and 0.5mm per day for depths above 40mm.

More benefits. More applications.

Topflow Screed A is perfect for a wide range of applications. Its high thermal conductivity and minimum thickness make it ideal for use with underfloor heating. Furthermore, because it’s free from protein and doesn’t harbour potentially harmful bacteria, it’s also the natural choice for hospitals and care homes.

BIM object

Click to download our BIM object for Topflow Architectural. For more information or to make it specific for your project contact

  • Achillies Building Confidence
  • Kitemark Readymix 2

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