A tile joint is the separation between each ceramic tile and those adjacent. This gap may be functional or aesthetic, or used to compensate for any irregularities between the tiles’ sizes.

With regards to these joints, the following considerations should be taken into account:

– Generally, a grout joint of not less than 1.5 mm is recommended (including rectified products).

– For products with an irregular edge, a grout joint of not less than 3 mm should be used.

– Concerning modulars (installing tiles together which have various formats) a grout joint of 5 mm is recommended for correct modularity.


These are areas of unavoidable interruption in the ceramic tiles in order to accommodate possible dimensional variations.

They are classified as follows:

Structural joints, which are those pertaining to the building structure. In this case, the joint must be left in the tiles coinciding with the joints in the structure or walls.

Perimeter joints, those which should be left at the edges of tiled surfaces with other areas such as walls, pillars, steps, etc., to avoid the build-up of structural pressure. These should be continuous and greater than 5 mm. They can be hidden by the skirting pieces, and must be filled with an elastic material up to the structural support.

Partition joints, used to divide large areas covered with tiles, to avoid accumulations of contractions and dilatations. The maximum area that should be covered without these joints is 60 m2 for interior surfaces and half the area in exteriors. Partition joints should be no narrower than 5 mm.