Placing in a thin layer of porcelain material and pieces without absortion

Increasingly, the trend of ceramic coatings, through the use of materials with a lower degree, or no water absorption.

This drastic drop in absorption has a significant reduction in mechanical adhesion, which must be compensated by an increase in chemical adhesion.

The placement of this type of materials presents certain singularities that should be considered to avoid later problems.

Preliminary analysis

The logical consequence of the decrease of porosity, is the difficulty of mechanically adhering all this type of ceramic tiles.

To fill this gap, in the placement of these materials we must use an adhesive with the following characteristics.

  1. It must have chemical adhesion, to be able to bond the support and the coating by contact.
  2. It must present a nature that gives it a certain flexibility to adjust to the movements of the support.
  3. Sufficient mechanical strength to withstand the stress caused by the weight of certain pieces with high formats and thicknesses.
  4. It must have a fine and compensated granulometry, which allows a correct placement and settlement of the coating, with ample open time to facilitate the work.

Technical considerations

In this type of application, different factors must be taken into account to correctly choose the adhesive and installation system.

Therefore, we must decide:

  • Whether the surfaces to be cladded are interiors (suffer less atmospheric aggressions) or exteriors.
  • The format of the ceramic to be installed and the substrate is important.
  • Before installing the floor, the public or private use thereof must be considered, in addition to the loads it will support (a supermarket is not the same as a car dealer, as a clothes store or a house).
  • Once all these options have been analysed, and considering that the union we expect in these materials is only by contact, we must always ensure that the entire surface of the cladding and the substrate is impregnated, without leaving any cavities.
  • It is recommended in all cases the application in thin layer of the pavement and make the technique of double gluing (application of the product to notched trowel both in the support and on the back of the piece) for formats over 2000 cm2.


A second consideration, but nonetheless essential, to be considered is the design of the joints, making sure to:

  • Leave at least 2 mm joint spacing between tiles.
  • Execute perimeter movement joints in corners and changes in plane, height or material.
  • Execute expansion joints between door and structural cavities of the building.
  • All expansion joints should be filled with elastic mastics such as GECOL Elastic-MS.


Jointing mortar must be applied in accordance with the times marked in the Technical Data Sheet of the adhesive.

Commissioning will take place 48 hours after executing the joint.

Recommended products




High performance

Joint mortars

From 0 to 20 mm quick setting

Up to 6 mm

From 3 to 15 mm

Flexible mastic

Elastomeric Mastic

Warnings: The data provided by this Constructive Solution were prepared based on standard onsite installation processes. However, we recommend that you consult our Technical Department in the event of any specific circumstance

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