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Heavy-duty screed heating cable for use in 40–100 mm screed layers.

Features and benefits:

  • Robust polyvinyl chloride (PVC) coating protects the TwistedTwin™ heating cable during installation and prolongs product life span.
  • Perimeter insulation foam acts as a thermal break and expansion gap around the screed.
  • Storage heating effect: In-screed systems have a slower heat up and cool down time and are suited to rooms that are in constant use, so heating can take place during off-peak times when low cost energy tariffs are active.
  • Suitable for use as primary or secondary heating applications in insulated properties.
  • Flexible cable spacing allows for variable heating output per square metre.
  • Range of control options including wireless and remote (specified separately).
  • Ten-year warranty.


Suitable for use as underfloor heating with a concrete screed with most floor finishes in new builds and renovation projects, subject to manufacturers’ guidelines on maximum floor temperature.

Standard product features

Perimeter insulation foam:

Size (roll, l x w x t): 50 m x 80 x 5 mm.



- 8 mm staples:

  • For fixing to foil-faced insulation boards only.
  • Allow four staples per linear metre of cable.
  • Supplied in packs of 600; tacker gun required for installation.

- Galvanized steel fixing profile:

  • 25 m roll, can be mechanically fixed to timber or concrete substrates.
  • Cable spacing in mm: Divide total heated area (m²) by cable length (linear metres) then multiply by 1000.
  • Recommended spacing: maximum: 150 mm; minimum: 50 mm.

Heating cables:

Consult manufacturer's literature for further details (cable length, output and resistance data).


For installations with an Economy 7 energy tariff, manufacturer recommends a manual control to switch the heating on and off in conjunction with the floor temperature sensor.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
90-40-35/492 Flexible cable electric heating elements

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying





+44 (0) 800 019 5899

Product reference

ThermoSphere Membrane


[ ______ ]


Output: 200 W; length: 11 m.
Output: 300 W; length: 16.5 m.
Output: 400 W; length: 22 m.
Output: 500 W; length: 27.5 m.
Output: 600 W; length: 33 m.
Output: 700 W; length: 39 m.
Output: 850 W; length: 45 m.
Output: 1000 W; length: 55 m.
Output: 1250 W; length: 69 m.
Output: 1375W; length: 76 m.
Output: 1700 W; length: 94 m.
Output: 2100 W; length: 116 m.
Output: 2600 W; length: 144 m.
Output: 3300 W; length: 183 m.


[8 mm plastic staples]
[Galvanized steel fixing profile]


To be specified separately.
[Not required]

Manufacturer details

Bridge House,
Pattenden Lane,
Kent, TN12 9QJ
Tel +44 (0) 800 019 5899
Fax +44 (0) 870 041 2140
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