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Atlas Postar 100, cement pourable mortar (10-50 mm)

11,31 / 25 kg inc. VAT, excl. shipping
(9,50 excl. VAT and shipping)

Ships within 10-12 business days after receipt of your payment

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ATLAS POSTAR 100 - self-spreading cement-based floor (10 - 50 mm)

Levels substrates in the range of 10 – 50 mm – depending on the construction concept, both when the substrate has only local irregularities and when it is in full made with a slope.
Creates a screed layer of high resistance – recommended for loading ramps, driveways, underground garages, parking lots, terraces, balconies, warehouses, etc.
Can function as the final layer or the substrate for other flooring.
Can be used as a subfloor with floor heating – does not require the use of plasticizing agents, conducts heat well.
May be used as a subfloor for finishing flooring layers, such as parquet, epoxy coats or epoxy screeds - it is characterised by high cohesion and resistance to setting forces, which may occur in the floor layer joint plane, e.g. during expansion and contraction of wood resulting from its humidity changes.

The main characteristics

  • very high compressive strength ≥ 50 N/mm²
  • for storage and production halls and for driveways
  • limited linear contraction
  • self - spreading – facilitates application
  • for manual or machine application

The main parameters:

  • consumption: 20 kg / 1 m² / 10 mm of layer thickness
  • compressive strength: min. 50 N/mm²
  • layer thickness: 10 ÷ 50 mm

Types of finishing layers

  • ceramic and stone tiles, 
  • epoxy screeds and shields, 
  • PVC flooring, 
  • carpet flooring, 
  • parquet, 
  • floor panels.

Types of possible arrangements

  • bonded floor – thickness 10 - 50 mm – substrate of good quality concrete, cement subfloor (with or without floor heating)
  • on separation layer - thickness 35 - 50 mm – when the substrate is of poor quality, not guaranteeing proper adhesion - dusty, cracked, oil soaked, dirty, very absorbable; the separation layer can consist of, e.g. PE foil 0.2 mm thick
  • floating - thickness 40 - 50 mm – applied onto thermal or acoustic insulation of: expanded polystyrene of proper hardness, floor hardened panels of mineral wool, etc.
  • heating – the layer thickness over the heating layer should be at least 35 mm


Perfect spreading – enables easy horizontal surface execution even in large rooms, without using guide strips and mass raking up with rules.
Compressive strength: ≥ 50.0 N/mm2.
Flexural strength: ≥ 7.0 N/mm2.
Very low linear contraction – minimum linear changes of the subfloor during drying (at 0.6 mm/rm) limit the possibility of cracking.
Suitable for machine application – enables fast and efficient execution of even large surface screeds.

Technical requirements

ATLAS POSTAR 100 conforms to PN-EN 13813 standard. EC Declaration of Performance No. 084/CPR.

CE PN-EN 13813:2003
(EN 13813:2012)
Cement - based subfloor CT-C50-F7-A15 for outdoor and indoor use, in wet and dry rooms
Reaction to fire - class A1fl
Release of corrosive substances CT
Compressive strength ≥ 50.0 N/mm²
Flexural strength ≥ 7.0 N/mm²
Abrasion resistance A15
Water and water-vapour permeability, abrasion
resistance, acoustic insulation, sound
absorption, thermal resistance, chemical

ATLAS POSTAR 100 has been given the ITB Technological Approval No. AT-15- 6971/2012. Domestic Declaration of Conformity No. 084 of 30.04.2012. The product has been given the Radiation Hygiene Certificate.

Technical data

ATLAS POSTAR 100 is manufactured in the form of dry mix of Portland cement, quartz fillers and modifying agents.

Bulk density (of dry mix) ca. 1.6 kg/dm³
Wet density (after mixing) ca. 2.0 kg/dm³
Dry density (after setting) ca. 2.2 kg/dm³
Mixing proportions
(water/dry mix)
ca. 0.12 ÷ 0.15 l/1 kg
ca. 3.00 ÷ 3.75 l/25 kg
Min./max. layer thickness 10 mm / 50 mm
Maximum aggregate size 3.0 mm
Linear changes < 0.06%
Mortar preparation temperature,
substrate and ambient temperature
during work
from +5°C to +25°C
Pot life min. 30 minutes
Rough floor access after ca. 24 hours
Floor covering after ca. 3 weeks*

* The time recommended for application in temperature of ca. 20°C and humidity of 55-60%.


Substrate preparation

The substrate should be stable, structurally sound and air dry, but the method of its preparation depends on the construction layout of the floor. General requirements for substrates:

  • cement -based screeds and subfloors - more than 28 days old,
  • concrete - more than 3 months old.

Bonded subfloor.

The substrate must be free from layers that can deteriorate adhesion, particularly dust, lime, oils, grease, bitumen substances, paints, weak and loose fragments of old rough floors. Surface cracks in the substrate should be widened, dusted and primed.
Fill with fast - setting repair mortar ATLAS TEN 10 or ATLAS ZW 330. Use ATLAS UNI - GRUNT PLUS emulsion for priming, once or twice, and leave for drying for min. 4 hours.

Subfloor on separation layer.

The separation material layer, e.g. PE foil,must be spread tightly, without wrinkles and folded onto the walls (over the expansion joint strips) to the height equal at least to the subfloor thickness.

Floating subfloor.

The insulation panels must be placed tightly upon an even surface with offset edges. Place the separation layer upon the panels and fold it onto the wall.

Subfloor in the heating system.

The heating installation must be checked and fixed (in case of water heating, fill up the pipes with water). It is recommended to execute the subfloor in one layer (with stable system fixing of the heating installation provided). During works, observe the data included in the technological project, and the recommendations of the heating installation manufacturer.

Expansion joints

Separate the floor or subfloor from walls and other elements within the work area with ATLAS EXPANSION JOINT PROFILE. The area of working pads should not exceed:
- in rooms 36 m², side length not larger than 6 m,
- outdoors 5 m², side length not larger than 3 m.
The expansion joints must also be executed around load bearing columns and at the thresholds of the rooms. The existing expansion joints must be carried over to the floor or subfloor layer.

Mortar preparation

Manual application – pour the mortar from the bag into a container with the suitable amount of water (see Technical Data for proportions) and mix until homogenous. This can be done mechanically with a low-speed mixer with a drill for mortars, flow mixer or cement mixer. The mortar is ready to use directly after mixing and retains its properties for about 30 minutes.
Machine application – pour dry mixture to the basket in the mixing-and-pumping unit and appropriately set the fixed level of added water that ensures correct consistency of the mix flowing out from a hose.

Mortar application

The mix is poured out mechanically using a mixing-and-pumping unit with continuous flow proportioning of water and worm pump. It can be also poured manually. Before starting the works, the future bed thickness is to be marked (on the walls within the pouring area). This can be done with, e.g. a level and portable height benchmarks. Pour the prepared mortar evenly and continuously up to the desired height, avoiding gaps.
Directly after filling an individual pad, the mix has to be de-aerated with, e.g. de-aeration roller or a brush with long and hard hair. Move the brush with a shaking movement along and across the surface. The assumed technological pad must be filled in, leveled and de-aerated within ca. 30 minutes.


Protect the subfloor against drying too fast, direct sunlight, low air humidity and draughts. In order to provide favorable setting conditions, sprinkle the surface with water or cover with foil. The drying time of the jointless floor depends on the bed thickness and on temperature and humidity conditions in the room. The jointless floor is ready to use (walk upon) after about 24 hours and is ready for full functional load after ca. 14 days.

Finishing works

Depending on the setting conditions, humidity, the type of floor covering and its permeability, tiling can start after ca. 3 ÷ 4 weeks and floor covering with PVC flooring or parquet - after the rough floor is completely dry. Before works commencement, it is recommended to prime the dried surface of the jointless floor with ATLAS UNI-GRUNT PLUS emulsion.


The average consumption is 20 kg of mortar for 1 m2 for each 10 mm of layer thickness.

Important additional information

  • Application of inappropriate amount of water for the preparation of the mix will result in deterioration of strength parameters of the subfloor. During works, control the mixing degree and consistency of the mix.
  • Before the underfloor heating is fully turned on, the temperature should be increased by maximum 2°C every 24 hours until the operation temperature is achieved. The temperature should then be lowered at the same rate until the heating is turned off.
  • Before the underfloor heating is fully turned on, the temperature should be increased by maximum 2°C every 24 hours until the operation temperature is achieved. The temperature should then be lowered at the same rate until the heating is turned off.
  • Tools must be cleaned with clean water directly after use.
  • Irritant - contains cement. Irritating to respiratory system and skin. Risk of serious damage to eyes. May cause sensitisation by skin contact.
  • Due to its form - powder, the product may cause mechanical irritation of eyes and respiratory system. Keep out of reach of children. Do not breathe dust. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Wear suitable protective clothing, gloves and eye/face protection. If swallowed, seek medical advice immediately and show the container or label. Follow the instructions in the Material Safety Data Sheet.
  • The mortar must be transported and stored in tightly sealed bags, in dry conditions (most preferably on pallets). Protect against humidity. Shelf life in conditions as specified is 12 months from the production date shown on the packaging. Content of soluble chromium (VI) in ready-to-use mix - ≤ 0.0002%.


Paper bags: 25 kg
Pallet: 1050 kg in 25 kg bags

3,75 / 25 kg inc. VAT, excl. shipping (3,15 excl. VAT and shipping)
7,42 / 25 kg inc. VAT, excl. shipping (6,23 excl. VAT and shipping)
10,30 / 25 kg inc. VAT, excl. shipping (8,66 excl. VAT and shipping)
10,40 / 25 kg inc. VAT, excl. shipping (8,74 excl. VAT and shipping)
Atlas Postar 40, cement-based compound (10-80mm)
5,37 / 25 kg inc. VAT, excl. shipping (4,51 excl. VAT and shipping)
Atlas Postar 80, fast-efficient cement floor (10-80 mm)
8,15 / 25 kg inc. VAT, excl. shipping (6,85 excl. VAT and shipping)
4,51 / 25 kg inc. VAT, excl. shipping (3,79 excl. VAT and shipping)
Place of application:
  • Indoor (dry rooms)
  • Indoor (wet rooms)
  • Outdoor
  • Tiles fixing
  • Parquet fixing
  • Installation of panels or carpet flooring
  • Screeds with heating
Layer thickness:
10 - 80 mm



Die Lieferung kam schnell mit guter telefonischer Absprache! Die Säcke waren gut verpackt, damit auch Regen keine Chance hat. Der Estrich ließ sich hervorragend verarbeiten und die Zugabewerte für das Wasser sehr stimmten. Ich habe den Estrich mit einem Mischer verarbeitet und hatte genügend Zeit für die Verarbeitung. Das Ergebnis war gut, jederzeit wieder.
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