What are anhydrite liquid screeds?

Anhydrite liquid screeds are designed to provide a smooth level surface in both commercial and domestic buildings prior to application of floor finishes. It can be used bonded, unbonded or floating and with or without underfloor heating.

Our Anhydrite screeds


  • Designed to improve the thermal performance of the underfloor heating systems allowing your system to run at lower input temperatures – therefore saving you money.
  • It is the ONLY screed to guarantee a minimum thermal performance approved by the BBA, allowing UFH designers to maximise the performance of your system.

Technical characteristics:

Mechanical strengthC30 F8
Thermal conductivity (nominal value)²λ=2,5Q/m.K
Thermal emission coefficient ³KH≥7, 42W/m².K
DiffusivityD=1,0.10-6 m²/s
Wet density2200kg/m³
Dry density2000kg/m³
Normal thickness above the pipe20mm
Minimum thickness by substrateUnbonded30mm

Installation benefits:

Flow250mm (± 20mm)
Productivityup to 200mm² / hour
or 1500m² / day


  • Designed to provide a smooth level surface in both commercial and domestic buildings prior to the application of floor finishes.
  • Can be used Bonded, unbonded or Floating with or without UFH and is BBA approved.
  • This screed can be laid thinner, with bigger bay sizes, no reinforcement, no curing membrane offering greatly reduced cracking and faster installation compared to traditional sand cement screeds.

Technical characteristics:

Mechanical strengthC25 – F4 BSEN 13813
Dry density2000kg/m³ (± 200)
Design thicknessMin 30mm – unbonded
Design thicknessMin 35mm (domestic)
40mm (commercial) – floating
Substrate typeSuitable for most substrates
Substrate regularitySR2 – BSEN 8204-7
Surface finishLow laitance option
Surface finishMay require sanding as part of floor finish installation
ReinforcementRequires no reinforcement

Installation benefits:

Flow270mm (± 10mm)
Working time180 mins from commencement of batching to finish dappling
(Area layout to be considered)
Productivityup to 200mm² / hour
or 2000m² / day

Work With Accredited Professionals

The FlowTech team comprises of Gas Safe Heating Engineers and accredited flow screed installers. We ensure that every installation we complete is done to the highest of standards guaranteeing you a high quality and energy efficient heating system that has been installed with your ongoing safety and comfort in mind.