Waterproofing systems are among the most frequent sources of problems in construction, even though, in theory, they are relatively simple. Most failures do not occur because of the materials themselves, but because of how those materials are selected and applied.

One of the most common errors is inadequate substrate preparation. Unclean, damp, or uneven surfaces lead to poor adhesion and the occurrence of water infiltration. No matter how high-performance the material may be, without a properly prepared substrate, the system is compromised from the outset.

Material compatibility is another critical issue. Membranes, mortars, primers, and protective layers must function as an integrated system. Chemical or mechanical incompatibility between layers can result in cracking, debonding, or loss of elasticity.

Execution details are most often the weak point. Penetrations, joints, corners, and connection areas are frequently treated superficially, even though they are the most exposed zones. The absence of local reinforcement or mechanical protection accelerates degradation.

Finally, waterproofing systems often fail due to the lack of maintenance. UV exposure, thermal variations, and unprotected traffic rapidly reduce the service life of systems that are not maintained.

Waterproofing is not a product, but a system. Without proper design, careful execution, and adequate protection, failure within the first few years becomes almost inevitable.

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