Bysewo Kolor Sp. z o.o.

80-007 Gdańsk

ul. Trakt Św. Wojciecha 373



Current exchange rates



  • Gypsum-based self-levelling floor underlayment
  • Application: in low-moisture rooms
  • Yield: ~ 2.0 kg/m2 per 1 mm of thickness
  • Bed thickness: 25-60 mm
  • Tile laying: after 28 days
  • Packaging: 25 kg


Self-levelling floor underlayment (25-60 mm)


  • for poured floor underlayment
  • underlayment for tiles, carpet flooring, laminate flooring panels
  • designed for low-moisture rooms
  • ideal for use with underfloor heating




  • gypsum/anhydrite
  • regulated consistency
  • up to 50 m2 without intermediate expansion joints
  • good thermal conductivity
  • for bonded, unbonded (on foil) and floating floors


Key parameters


  • yield: 20 kg/1 m2/1 cm of thickness
  • bed thickness: 25-60 mm
  • compressive strength: min 16 N/mm2



Substrate levelling from 25 to 60 mm – for levelling both uneven spots and slightly sloped floors.
Increasing floor level height in a room – e.g. to align floor levels in two adjacent rooms.
Ideal for use with underfloor electric or water heating systems – very good thermal conductivity (better than cement-based products); heating wires or pipes are completely embedded.
Recommended for levelling existing heating screeds.
A part of the FONER ceiling sound insulation system – together with STYROFLEX flexible EPS, ATLAS EXPANSION TAPES and polyethylene foil.
Designed for low-moisture rooms – as an underlayment product based on high-grade anhydrite, ATLAS SAM 200 is designed for indoor use only, in low-moisture rooms: bedrooms, entrance rooms, halls, living rooms, office rooms, corridors, waiting rooms etc.
Bonded floors – 25-60 mm thick – on quality concrete, cement or anhydrite screed (with or without underfloor heating)
Unbonded floors on a separation layer – 30-60 mm thick – on poor quality surface that does not provide appropriate adhesion (chalking, cracked, oiled, soiled or highly absorbing substrate); for example 0.2 mm PE foil can be a good separation layer
Floating floors - 35-60 mm thick – poured on thermal or sound insulation made from, for example, EPS boards of at least EPS 100-038 grade, hardened mineral wool flooring panels etc.
With heating systems – the screed over the heating layer should be at least 35 mm thick


Self-levelling properties – horizontal and even surface can be obtained even in large rooms, without the need of using screed rails and pulling a straight edge along them to remove excess mortar.

Compressive strength: ≥ 16 N/mm2.
Flexural strength: ≥ 5 N/mm2.

Practically non-shrinking – crazing during drying is minimised – uniform surfaces of up to 50 m2 without intermediate expansion joints can be obtained.
Designed for mechanical or manual pouring – the underlayment can be poured quickly and easily both manually and with a screw mortar pump to achieve high yield.



Substrate preparation

The substrate should be stable and structurally sound. General requirements for substrates:

  • cement screeds (at least 28 days old, moisture content ≤ 3%),
  • concrete (at least 3 months old, moisture content ≤ 3%),
  • anhydrite substrate (moisture content ≤ 0.5 %) – mechanically roughed and vacuum cleaned.

All steel parts that are in contact with the underlayment should be protected against corrosion.

Bonded floor. The substrate must be free of any layers that could compromise adhesion, including especially dust, lime, oil, grease, bitumen, paint, weak or loose pieces of old screed. Widen, vacuum clean and prime any surface cracks. Use ATLAS TEN-10 quick setting mortar to repair them. For priming, use ATLAS UNI-GRUNT PLUS primer: apply once or twice and leave for at least 4 hours to dry.

Unbonded floor on a separation layer. The separation layer (e.g. PE foil) should be placed tightly, without creases, and folded onto walls (expansion joint strips) at least up to the height of the underlayment.

Floating floor. Insulation boards or panels must be installed tightly, on even surface, with offset edges. A separation layer should be installed on the panels and folded onto the walls.

Unbonded floor with underfloor heating. The heating installation should be checked and secured properly. It is recommended to install single-layer screed (with the heating installation secured in place with a stable fastening system). Guidelines provided in the detailed specification of the heating system and manufacturer’s recommendations should be observed.


Expansion joints

Use ATLAS EXPANSION TAPE for perimeter expansion joint and apply expansion joints around other items within the floor installation area. Intermediate expansion joints are not necessary if the jointless floor area is to be smaller than 50 m2 and the diagonal is less than 10 m. All movement joints should be mirrored in the screed. Contraction joints at load bearing columns and door sills must be maintained.


Mix preparation

Mechanical pouring – put the dry mixture into the mixing/pumping unit silo and set fixed water dosing to ensure that the mix flowing out from the hose has desired consistency.

Manual pouring – pour the bag content into a container with suitable amount of water (observe the proportion provided in the Technical Data Sheet) and mix until you get homogenous mixture; it is recommended to use a mechanical mixer. The mix is ready to use immediately after mixing. It maintains its properties for ca. 45 minutes. To check consistency, pour out the mortar from a 1 l container onto even and non-absorptive substrate (e.g. foil). The mortar should form a "patch" of ca. 45-50 cm in diameter.



Before starting the work, mark the desired level of the underlayment (on walls and within the pouring area). It can be done with – for example – a bubble level and portable height benchmarks. Mechanical pouring: use a mixing/pumping unit with continuous flow proportioning of water; Manual pouring: only on surfaces divided into smaller sections of 10-15 m2.

Pour the mix evenly, up to the desired height; avoid any gaps. Immediately after pouring the mix in each section, de-aerate it using, for example, a de-aerating roller or a brush with long and hard hair. Move the brush in shaking manner along and across the poured underlayment surface. Then the self-levelling occurs automatically. Each section should be filled in, smoothed and de-aerated within about 45 minutes.



During the first two days of screed hardening, do not expose the floor to direct sunlight or draughts and provide proper ventilation of rooms. If white efflorescence appears on the surface remove it mechanically by grinding and vacuum clean the entire area. Grinding accelerates the drying process. The drying time of anhydrite screed depends on the layer thickness and also on the temperature and humidity in the room.


Floor finishing

Depending on the hardening conditions, humidity and permeability of the flooring material, flooring may be laid after 3-4 weeks, on average. Before commencement of the work, it is recommended to prime the dry screed with ATLAS UNI-GRUNT PLUS primer.


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Sad Rejonowy Gdansk Polnoc VII Wydzial Gospodarczy Krajowego Rejestru Sadowego
KRS: 0000130972 NIP: 583-000-03-39 Kapital zal. 200 000 PLN