Bysewo Kolor Sp. z o.o.

80-007 Gdańsk

ul. Trakt Św. Wojciecha 373



Current exchange rates



  • Gypsum-based self-levelling floor smoothing compound
  • Application: in low-moisture rooms
  • Yield: ~ 1.8 kg/m2 per 1 mm of thickness
  • Bed thickness: 1-10 mm
  • Tile laying: after 3 days
  • Packaging: 25 kg

Self-levelling floor smoothing compound (1-10 mm):

  • for poured floor underlayment
  • underlayment for tiles, carpet flooring, laminate flooring panels
  • designed for low-moisture rooms


  • gypsum/anhydrite
  • resistance to concentrated loads
  • up to 50 m2 without intermediate expansion joints
  • good flow and levelling properties; quick setting
  • good bonding with substrate

Key parameters:

  • yield: 1.8 kg/1 m2/1 mm of thickness
  • bed thickness: 1-10 mm
  • compressive strength: min 30 N/mm2


Substrate levelling from 1 to 10 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.
Recommended for levelling existing heating screeds – when flooring cannot be installed on uneven screed and additional thin underlayment is necessary.
Designed for low-moisture rooms – as an underlayment product based on high-grade anhydrite, ATLAS SAM 55 is designed for indoor use only, in low-moisture rooms: bedrooms, entrance rooms, halls, living rooms, office rooms, corridors, waiting rooms etc.
Underlayment for flooring exposed to medium load – in offices, kindergartens, schools.
Bonded with the substrate – 1-10 mm thick – on quality concrete, cement or anhydrite screed (with or without underfloor heating).


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: ≥ 30 N/mm2.
Flexural strength: ≥ 5 N/mm2.
Practically non-shrinking – crazing during drying is minimised – uniform surface sections 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..


The substrate should be stable and structurally sound. To avoid the outflow of the poured underlayment, the room floor should have a tank-like profile. 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.

Widen, vacuum clean and prime any surface cracks with ATLAS UNI-GRUNT PLUS primer. After 4 hours, use ATLAS TEN-10 quick setting mortar to repair them. Vacuum clean the repaired substrate and apply plenty of UNI-GRUNT PLUS primer and leave for at least 4 hours to dry. Repeat priming if the primed substrate is still absorptive. All steel parts that are in contact with the underlayment should be protected against corrosion.

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. 30 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.


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. 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. 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 30 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 days, 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