1.6 mm AquaStop

Thin and high-performance
Its thin design makes SELITFLEX® 1.6 mm AquaStop an excellent choice for combination with underfloor heating. Despite its slim design, the underlay offers very good sound insulation values and reliably protects your floor from damage caused by falling objects. The integrated vapour barrier stops rising moisture. With pre-laminated silent laminate floors, SELITFLEX® 1.6 mm AquaStop is used as an additional underlay to level out small uneven areas.

Polystyrene foam with good compressive strength - ideal for underfloor heating

  • protects against falling objects
  • Good impact and walking sound insulation
  • Suitable for underfloor heating systems
Order number70218
Thickness1.6 mm
Dimensions1.20 x 15 m
Package contents18 m²
Why 1.6 mm AquaStop

Easy to process

Easy to install
as a folding panel

Easy to cut
due to printed grid

Protects the floor from damage

Protection against
loads and use

Protection against
falling objects

Protection against
rising moisture

Protection in
uneven areas

Increases living comfort

Suitability for
underfloor heating*

Reduction of
walking sound

Reduction of
impact sound

Installing 1.6 mm AquaStop –

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
Thoroughly clean the subsurface using a broom or a vacuum cleaner. Completely remove existing adhesive residue and paint residues.

Laying out the first panel

Laying out the first panel

Step 2
Over the entire width of the room, first lay out the first sheet of the installation underlay with the foil side facing upwards, cutting off the overlap in the wall connection area.

Masking joints

Masking joints

Step 3
As protection against moisture, vapour-tightly tape possible faces together using the SELTstop® aluminium sealing tape.

Masking the wall connection area

Masking the wall connection area

Step 4
To protect from moisture, seal the wall connection area with the stable and pre-creased SELITstop® Moulding Protection Belt.

Installing the flooring

Installing the flooring

Step 5
Lay the flooring in the same direction
as the underlay. Do not strain the underlay; if necessary put a laminate board under your knees/feet in oder to spread the load.

Finishing the installation

Finishing the installation

Step 6
Repeat steps 2 to 5 until the entire room is laid. Seal the individual layers of the underlay with the overlap and the adhesive tape. Seal other potential joints vapour-proof using the aluminium sealing tape.

Technical data (according to EN 16354)
Punctual conformability (PC)up to 1 mm
Compressive strength (CS)≥ 60 kPa
Compressive creep (CC)≥ 5 kPa
Dynamic load (DL25)≥ 100,000 cycles
Resistance to large ball (RLB)≥ 90 cm
Water vapour diffusion resistance (SD)≥ 100 m
Thermal resistance (R)∼ 0.060 m²K/W
Impact sound reduction (IS)up to 20 dB
Reaction to fire (RTF)Efl
*Suitability for underfloor heatingYes, if flooring R ≤ 0.09 m²K/W (e.g. laminate up to approx. 12 mm, wood flooring up to approx. 14 mm)

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


SELITFLEX 1,6 mm AquaStop Produktinformationsblatt
Size: 2 MB
SELIT Catalogue 2021
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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