Ronafix Prepacked Underfloor Heating Screed 40mm Plus – 25Kg Bag

£38.21 exl. VAT

Per Unit


SKU 105061409272439006 Categories ,

Prepacked Polymer Modified Screed for Underfloor Heating Systems

  • Foot traffic after 24 hours
  • Fast drying, can receive floor coverings after 15 days @ 75mm
  • Rapid early strength development
  • Suitable for underfloor heating systems
  • Suitable for screed pumps

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Ronafix Prepacked Underfloor Heating Screed 40mm Plus

Ronafix Prepacked Underfloor Heating Screed 40mm Plus. Ronafix Pre-packed Underfloor Heating Screed is supplied as a pre-packed, ready to use mortar for laying floor screeds on underfloor heating systems. It is supplied complete as a bag of dry components and a bottle of polymer gauging liquid.

  • Conforms to BS EN 13813
  • For use with underfloor heating systems
  • High early strength and fast drying allow earlier commissioning of heating systems
  • 40mm minimum thickness with 16mm diameter heating pipes
  • Requires only 20mm cover over heating pipes
  • Ready for foot traffic after 24 hours
  • Rapid drying—can receive floor coverings such as vinyl, tiles and carpet after 10 days @ 50mm thick
  • Excellent resistance to the passage of water and water vapour


Mixing – Ronafix Pre-packed Underfloor Heating Screed must be mixed by forced action mixer such as a Baron or CreteAngle mixer. Free fall mixers must not be used. Mix for approximately 3 minutes. Over mixing will entrain air which may reduce performance. Once mixed the mortar should be used as quickly as possible.

Placing – As soon as the mortar is mixed, it should be placed onto the substrate, compacted, ruled and closed with a float or trowel. Avoid overworking the surface, this will increase the tackiness of the mortar. The float should be regularly washed, to prevent build up of polymer/cement paste. Thicker screeds may be applied in two layers, wet on wet to aid compaction. Layers should be of approximately equal thickness. The base layer should be raked after compaction. To ensure satisfactory adhesion the lower layer should be raked to provide a key for the next layer. Should an intermediate layer begin to harden, a priming coat must be applied before application of the next layer.


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Additional information

Suitable for Substrates

Minimum Thickness: 45mm   Depending on Heating Pipe Thickness

Maximum Thickness:

Compressive Strength @ 28 days: 47 N/mm2

Walkable: 24 Hours

Finished Floor Laying After: 10 days

Suitable for Substrates: Concrete



The Ronacrete group manufacture a comprehensive range of specialist materials for installation by expert contractors. For over 40 years, Ronacrete has been at the leading edge of product development and performance and across their six ranges, the company offer specialist solutions for a huge range of applications, from waterproofing and tanking to resin surfacing and specialist screed solutions.

Technical Information