Terrace Waterproofing

Terraces and flat roofs are one of the most exposed points of any home on the Costa Blanca: they take direct sun for most of the year, suffer sharp day-to-night temperature swings, and in many cases collect rainwater during the autumn and winter months. Over time, that cycle cracks the joints and the paving itself, and water ends up seeping into the home below.

The first step is always diagnosing the real source of the leak — sealing the surface isn't enough if the crack or open joint causing the problem is still there underneath. We check the condition of the paving, the expansion joints, the drains and where the surface meets parapets and walls before deciding on the most suitable waterproofing system.

Depending on the case, we apply liquid elastomeric membranes (which flex with small structural movements without cracking) or waterproof sheeting, always with prior priming in the most critical areas: parapet junctions, drains and expansion joints, which are almost always where a leak starts.

Once waterproofed, the terrace can take a new walkable surface or stay protected under the existing one, depending on the system applied. If the terrace is part of a residents' community, we coordinate the work just as with any other façade job — see community and block painting.

This service is often combined with façade work, since both affect the building's exterior envelope and share some of the scaffolding or access — see exterior and façade painting. If you'd like an idea of cost before the technical visit, see what determines the price or use the online estimator.

The summer heat and the autumn and winter rain are the two extremes that put the most strain on a terrace in the Vega Baja: sun dries out and cracks poorly applied sealants, and accumulated rain finds those cracks to seep through. That's why we always assess the condition of the paving and joints before deciding on the system, rather than applying a generic solution.