Underfloor heating filler LL 5500

Product description

The Fescon LL 5500 is a fibre-reinforced, casein-free underfloor heating filler compound with a special cement binder that hardens and dries rapidly.


  • Good workability, adhesion and wear resistance
  • For layer thicknesses 10-80 mm


  • Underfloor heating filler for indoor concrete floors
  • Underfloor heating filler for indoor primed plasterboard floors
  • Graded floors requiring rapid hardening and drying
  • Ceramic or stone tiles, or parquet, for example, can be installed on the levelled base
  • If necessary, finish with Fescon FlowPlan. Fine levelling is recommended when installing plastic or textile carpets, vinyl tiles or cork
  • Overlaid underfloor heating filler LL5500 can be waterproofed according to the Fescon waterproofing instructions
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EAN code Product name Product number Package size
6416841202017 Underfloor heating filler LL 5500 20 KG 20201 20 kg




  • Clean, solid and dust-free
  • Sufficient strength, load-bearing capacity and immobility
  • Temperature >+10 oC and relative humidity <95% RH
  • Any substances reducing or preventing adhesion must be carefully removed


  • Carry out the priming in accordance with Fescon Adhesive Primer instructions
  • When beginning the levelling work, there must be no puddles of primer
Instructions for use
  • Mix a bag of the levelling compound in 3.0-3.6 litres of clean water
  • Mix the LL 5500 into a consistent paste using a drill paddle
  • Spread the compound on the base and level with a steel trowel
  • Working time is around 20 minutes from adding the water
  • Wash the tools and equipment with water immediately after completing the work
  • Remove dried levelling compound mechanically
  • The Fescon LL 5500 can be covered with all flooring materials, including natural materials
  • We do not recommend leaving the floor levelling compound without coating
Waste handling

Storage and handling of waste. See the separate storage and disposal instructions https://www.fescon.fi/en/material-bank

Technical information

Material usage

1.8 kg/m2/1 mm.

Water requirement 3.0-3.6 l/20 kg
Binder special cement
Aggregate lime filler
Colour grey
Maximum grain size

1.2 mm

Package size 20 kg

12 months in a dry room

Mixing time 1-2 min
Layer thickness

10-80 mm

Fibre Plastic fibre
Usage temperature

+ 10°C...+25°C

Workability time approx. 20 min
Drying time

1 mm/h (+20 °C, 50% RH)

Walkable approx. 2- 3 h
Strength class C 20 (EN 13813)
Compressive strength

> 30 MPa (28 days, +20 °C, RH 50 %)

Adhesion strength

28 days > 1.2 MPa

Flexural bond strength F 5 (EN 13813)
Surface tensile strength > 1,0 MPa (28 days, +20 °C, RH 50 %)


The information is based on tests and practical experience. We cannot affect conditions at the work site so we cannot assume responsibility for the end result affected by local conditions.


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