screed joists underfloor heating

New Build with Anhydrite Liquid Screed


When building from new Flow screed works hand in hand to give a far superior feel to the floors.

There are many systems available that you can use when you require a pre-completion test for Part E of the building regulations.

If using Concrete planks there are robust detail systems available.

Using timber flooring systems for soundproofing may be slightly cheaper but can give a real headache when it comes to floor coverings.

Tiles do not generally like flexible substrates so bathrooms and kitchen floors are difficult to finish.


Flow Screed on Joists


Due to Anhydrite liquid screeds flexural strength and durability you can screed directly on to joists. This allows you to use screed on separating floors. 

  • Reduce costs of builds compared to using block and beam
  • Incorporate underfloor heating on separating floors with ease
  • Sound reduction for enhanced living


When designing any new builds simply get your preferred floor joist manufacturer to engineer the floor to take the weight of Anhydrite floor screed.

Liquid screed generally has a weight of 900N/m2 at 50mm.

Timber Frame manufacturers can design in from the start with ease. 


An example build-up would be-


  • Engineered Joists to Manufacturers design
  • 15mm tongue and groove OSB
  • 25mm PIR insulation ( not specifically required)
  • DPM membrane 1200gu
  • Underfloor heating 
  • 45-50mm Anhydrite Floor Screed

This could not be achieved with a traditional sand and cement screed due to its unforgiving characteristics.


Above is a typical section of a traditionally built house with liquid Anhydrite Screed on both floors. This is built to current NHBC standards.


The Yelofon HD+ System is a perfect partner to Anhydrite screed. You can also incorporate underfloor heating using these systems.

For more details of the systems available click on the link.


Please call us if you require any more information.