10 mm THERMO

The name says it all
Say goodbye to cold floors. SELITFLEX® 10 mm THERMO reduces heat loss by up to 30 %. This means that your floor gets up to 4 °C warmer and you also save on energy and heating costs. In addition, the underlay is impressive thanks to its very good performance data and is capable of levelling out areas of unevenness up to a height of 4 mm.

Polystyrene foam with good compressive strength – Floor is up to 4 °C warmer

  • Excellent thermal insulation
  • Protection against falling objects
  • Levels out unevenness
Order number70619
Thickness10 mm
Dimensions0.5 x 1.2 m
Package contents6 m² + Tape
Why 10 mm THERMO

Easy to process

Easy to install
as a folding panel

Protects the floor from damage

Protection against
loads and use

Protection against
falling objects

Protection in
uneven areas

Increases living comfort

Reduction of
walking sound

Reduction of
impact sound

Thermal insulation
for cold floors

Installing 10 mm THERMO –

a step-by-step guide

Before installation, please note: Check the base in accordance with CEN/TS 14472 and ensure that the quality of the base is suitable for proper processing. In general, the base should be clean, level, dry, resistant to tension and compression and should not contain any substances such as plasticisers, solvents or other diffusing substances. It must be ensured that the base is in a state of equilibrium humidity and that the CM value is below 2.0 % (for cement screed) or below 0.5 % (for anhydrite screed and anhydrite flowing screed. The processing instructions of the flooring manufacturer are to be observed as binding specifications.

Cleaning the surface

Cleaning the surface

Step 1
Clean the surface thoroughly with a brush or vacuum cleaner. Remove any adhesive and paint residues completely.

Laying out the first panel

Laying out the first panel

Step 2
Lay the first panel of the underlay flush with the wall over the entire width of the room. Make sure that the aluminium side is at the top.

Masking joints

Masking joints

Step 3
To protect against moisture, seal possible joints with SELITstop® Aluminium-Foil Sealing Tape to make the joints vapour-tight.

Masking the wall connection area

Masking the wall connection area

Schritt 4
Mask the wall connection area with SELITstop® Moulding Protection Belt to protect against moisture.

Installing the flooring

Installing the flooring

Step 5
Lay the flooring in the same orientation as the underlay. Do not place any load on the underlay. If necessary, place the board under your knees/feet to distribute the load.

Finishing the installation

Finishing the installation

Step 6
Repeat steps 2 – 5 until the entire floor has been installed. Use the Aluminium-Foil Sealing Tape to seal the joints so that they are vapour-tight.

Technical data (according to EN 16354)
Punctual conformability (PC)up to 4 mm
Compressive strength (CS)≥ 25 kPa
Compressive creep (CC)≥ 5 kPa
Dynamic load (DL25)≥ 100,000 cycles
Resistance to large ball (RLB)≥ 140 cm
Water vapour diffusion resistance (SD)≥ 100 m
Thermal resistance (R)∼ 0.32 m²K/W
Impact sound reduction (IS)up to 20 dB
Reaction to fire (RTF)Efl
*Suitability for underfloor heatingNo

Meets the minimum requirements of the EPLF and MMFA (Group 1)


SELITFLEX 10 mm Thermo Produktinformationsblatt
Size: 2 MB
SELIT Catalogue
Size: 7,8 MB
Excellent quality
Made in Germany.

Emissions-tested: A+

In accordance with the French VOC regulations, our underlays achieve the lowest emission values and therefore feature the A+ mark.
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Approved by the building authorities

Stay on the safe side with SELIT: all our underlays are approved by the building authorities.
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