3 mm AquaStop

Versatile and high-performance
SELITFLEX® 3 mm AquaStop combines good performance data with reliable protection against rising moisture and damage caused by impact loads. Thanks to its 3 mm thickness, it compensates for minor unevenness in the floor.

Polystyrene foam with good compressive strength – Good protection against moisture damage

  • Evens out minor unevenness
  • Good impact and walking sound insulation
  • Protection against rising moisture
Order number70211
Thickness3 mm
Dimensions1.20 x 8.5 m
Package contents10.2 m²
Why 3 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

Reduction of
walking sound

Reduction of
impact sound

Installing 3 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
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

Step 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 room is laid. Using the overlap and the adhesive strip, glue the individual strips of the
carpet pad with the overlap and the adhesive strip. Cover any additional head joints with the aluminum sealing tape to make them vapor-tight.

Technical data (according to EN 16354)
Punctual conformability (PC)up to 2 mm
Compressive strength (CS)≥ 25 kPa
Compressive creep (CC)≥ 2 kPa
Dynamic load (DL25)≥ 10,000 Cycles
Resistance to large ball (RLB)≥ 140 cm
Water vapour diffusion resistance (SD)≥ 100 m
Thermal resistance (R)∼ 0.10 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 3 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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