Gyvlon Thermio Plus

A pumpable self-smoothing, flowing screed manufactured to BS EN 13813. It is specifically designed to complement both water underfloor heating and cooling systems.


  • Guaranteed thermal performance.
  • Coupled with an underfloor heating or cooling system guarantees a pipe encapsulation and an emitter.
  • Up to 30% increase of the thermal value coefficient for maximized performance of the underfloor heating system.
  • Up to 80% thermal diffusivity for a much faster ramp-up in temperature, greatly improving immediate and long term comfort.
  • Up to 8% savings on heating bills.
  • Very high fluidity for fast installation.
  • Easily achieves SR2 finish as described in BS 8204.
  • Extremely low shrinkage - does not curl and minimizes the risk of cracking.
  • Maximum bay size of 300 m².
  • Avoids the need for reinforcement and no need for a curing membrane.
  • Environmentally friendly – 36% recycled content, 100% recyclable.
  • Low inertia.

General information


SR2 to BS8204




Productivity of up to 1500 m² per day, 80% increase in diffusivity, 30% increase in thermal co-efficient, self-compacting, self-curing, no reinforment required, can be force-dried after 7 days, protein free, excellent thermal conductivity, environmentally friendly


Calcium sulfate binder, selected aggregates

Uniclass 2015

Pr_35_31_06_71 Ready-mixed levelling and wearing screedsPrimary


M13/120 Proprietary self smoothing levelling screeds

Specification data - Ready-mixed levelling and wearing screeds

Product Reference


Standard product features


  • Dry: 2.000 kg/m³.
  • Wet: 2.200 kg/m³.

Technical Properties:

  • Mechanical strength: C30 F8.
  • Thermal conductivity: 2.5 W/mK.
  • Thermal emission coefficient: 7.42 W/m²K.

Product Options

Sub base:

Gyvlon screeds are suitable for application to most types of sub bases, demonstrating an excellent degree of dimensional stability (maximum shrinkage/ expansion on drying of 0.02%) when compared to traditional sand/ cement based screeds.

Application thickness (minimum):

  • Unbonded: 30 mm.
  • Floating residential: 35 mm.
  • Floating commercial: 40 mm.
  • Underfloor heating: 20 mm (nominal).

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