Features and Benefits

Assembly and repair mortar.

Mortar for precise assembly of elements and filling up cavities, characterized by a comfortable setting time.


  • Comfortable setting time (20 min)
  • High strength after curing
  • For reconstruction of concrete elements
  • For filling cavities and cracks up to 50 mm
  • Water and frost resistant
  • Chloride free – does not cause corrosion of metal elements
  • Light grey color

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Ceresit CX 20 COMFORT is a mortar for precise assembly of elements and filling up cavities, characterized by a comfortable setting time (20 min), which makes it suitable for a wide range of users.  Ceresit CX 20 COMFORT has a perfect consistency both for horizontal and vertical surfaces and is water and frost resistant, so it is a safe solution for indoor and outdoor applications. Ceresit CX 20 COMFORT helps to handle any task without effort and rush.

Ceresit CX 20 COMFORT can be used for:


  • assembly of elements made of metal, plastics, etc., e.g. anchors, hooks, connectors, hinges, elements of electrical installations (junction and outlets boxes), guide strips or corner slats, installation elements (passage pipes), embedding of installation elements and brackets, on
  • substrates such as concrete, walls (brick, concrete blocks, cellular concrete, etc.). In the case of larger cavities or assembly of heavier components, it is necessary to temporarily stabilize them, for example, by supporting them.
  • filling cavities and cracks of the size from 5 to 50 mm in walls and plasters (e.g. filling installation grooves), in ceiling and wall elements, floors and all kinds of prefabricated elements. Larger cavities should be filled with Ceresit CX 20 COMFORT mixed with pure sand in the ratio 1: 1.
  • reconstruction of damaged concrete elements, plasters, etc., e.g. edges of stairs, corners of walls from 50 to 100 mm.

When using for local sealing of concrete constructions and for damaging local water leaks, it is recommended to use Ceresit CX 5 EXPRESS quick setting mortar. Heavy installation and machinery should be assembled using Ceresit CX 15 STRONG mortar.

Step by step

Substrate preparation


Ceresit CX 20 COMFORT mortar can be applied on compact, load-bearing and clean substrates free of substances that reduce adhesion, such as: fats, bitumen, dust. The substrate should be forged or drilled with a mounting hole of min. 5 mm larger than the embedded element. In the case of larger cavities, the gap should be disassembled in the so-called swallow tail.


Before application, the substrate should be moistened abundantly with water. Apply the material on matte-moist substrates. In the case of reconstruction of damaged elements, it is recommended to apply the mortar to the substrate with a hard brush and then apply the material “fresh on fresh” in one technological cycle.



Example: Reconstruction of damaged concrete stairs with CX 20 COMFORT

  1. Check production date and all technical requirements and prepare the right amount of CX 20 COMFORT.
  2. Measure the amount of water needed and pour into the bucket for mixing.
  3. Pour the specific amount of CX 20 COMFORT into the water.
  4. Stir until homogenous without lumps (2-3 minutes).
  5. Apply CX 20 COMFORT in the cavities.
  6. Reprofile a proper shape.
  7. The mortar will set within 20 minutes.