Analyzes on faulty mosaic pool joints

The joints of a tiling or mosaic in a swimming pool are the first defense against the infiltration of water in depth. Indeed, if the joints are defective, water will infiltrate between the tiling and its support causing their separation.

In addition to the art of installation, their chemical nature and therefore their mechanical property and their resistance to various aggressions (cleaning products, high pressure washing, water treatment, climatic conditions, etc.) is essential. They must be water-repellent and very resistant to be able to adapt to permanent immersion in water for several years, but also antibacterial, antifungal and anti-algae so as not to be the starting point for algae nesting.


The different products for making pool tile / mosaic joints

Expertise piscine - Décollement

There are products that allow you to make joints only and mortar - joints that have a dual function: glue the ceramics and make the joints immediately. There are one-part products and two-part epoxy products.

  • Single-component product: It is made up of special cements, siliceous sands, specific water repellants and additives. Comes in the form of a powder to be mixed with water.
  • Two-component epoxy mortar : It consists of an epoxy resin (base) including fine mineral fillers and a hardener. As for all products containing a resin, the dosage, the mixing of the components and the crosslinking time must be strictly carried out and respected. It represents the highest quality for making joints (and gluing ceramics).
Joints de carrelage et mosaïque de piscine

Study of the composition of pool tile / mosaic joints


It is possible to carry out structural analyzes by Pyrolysis/GCMS to study the nature of the polymer matrix and of the adjuvants (water-repellent, etc.) and to respond to concrete issues:


  • Is there a water repellent in this joint mortar?
  • Is it a one-component product or a two-component epoxy mortar?
  • Comparison of composition between a healthy area and a damaged area?
  • Was this two-component epoxy mortar mixed in the correct stoichiometric proportions?
  • Was the crosslinking of this two-component epoxy mortar complete before filling the basin with water? Time before filling respected?
  • Detection of cleaning products, water treatments that could have degraded the seals.

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