A screed with high thermal conductivity for use with underfloor heating systems.
Supaflo HTC should only be used if the building envelope is complete; doors and windows should be in place and must be closed for the first 24 to 48 hours after installation to prevent drafts blowing across the surface of the screed.
Supaflo HTC is a self-compacting flowing screed based on an anhydrite binder. It is specifically intended for use with underfloor heating systems and is formulated to provide a floor with higher thermal conductivity when compared to traditional cement, sand screed and regular flowing screed.
The product can help improve the sustainability criteria when compared to conventional screeds, it can also be installed with a minimum cover to the underfloor heating pipes of 20 mm, subject to substrate suitability. At this reduced cover some differential settlement may occur.
It is recommended the screed is lightly sanded prior to overlaying and is compatible with all types of floor covering.
Features and benefits:
M13/10 Proprietary trowelled levelling screeds
M13/110 Proprietary trowelled levelling screeds
Off-white fluid mortar.
Plastic: 2150–2250 kg/m³; Dry: 1950–2050 kg/m³.
Compressive strength - 28 days
(BS8204:7 Annex A, Truncated cone).
Samples prepared using reference sand tested by Warwick University to ASTM 1530 achieved 2.5 W/mK. For UK calculation a value of 2.3 W/mK is recommended.
Batched, transported, placed and finished within three hours.
Five to seven days.
Approximately 1 mm per day up to 40 mm, then 0.5 mm per day.
Floating including underfloor heating – 20 mm cover above pipes or cables. Most underfloor heated screed are installed 45 to 55 mm thick.
24 to 48 hours.
Binder 10–20 kg per tonne.
Binder: 98%. Mortar up to 40%.