The majority of waterproofing failures are caused not by the material but by junction details. The cross-sections below show the most common building elements and the errors most frequently repeated on site. The drawings are schematic; every building's solution is determined by its own conditions.
The flat roof terrace is the building element where the layer sequence is most frequently confused. In the widely used inverted build-up, the layers from bottom to top are: the sloped structural slab, the waterproofing, a polyethylene sheet as the separation layer, the thermal insulation, a heat-treated geotextile felt (at least 300 g/m²) and, on top, a sloped protection screed with joints. A conventional (warm) build-up with the insulation below the waterproofing is also valid when designed with a vapour control layer. Falls should preferably be formed below the waterproofing, in the structural slab. The direction and gradient of falls must be correct for water to reach the drain.
The drain detail is the most critical point of this element. The drain is bedded in epoxy grout mortar and the waterproofing layer is joined continuously to the drain flange. When this junction is not correctly formed, water will pass to the space below even if the rest of the terrace is perfectly executed.
ETICS is a system, not just a material: adhesive, board, fixings, reinforcing mesh, base coat and finish coat must all be compatible. Mixing products from different manufacturers voids both system warranty and performance.
In wet rooms, waterproofing is applied beneath the tiles, on top of the screed, and turned up the wall to a defined height. Most ceiling stains in the flat below come not from tile grout joints but from missing upstands or poor drain junctions.
For below-ground building elements, waterproofing alone is not sufficient; water must be directed away from the structure before it can bear against it. If drainage is not working, even the best waterproofing layer will eventually fail under hydrostatic pressure.
What determines the life of a coating is not the coating itself but the concrete beneath it. If the surface has not been mechanically prepared, the concrete has not dried sufficiently or moisture rises from below, the coating will not bond to the concrete. The failure appears in the coating; its origin is in the substrate. The same principles apply equally to a factory floor, an apartment lobby or a cafe floor; the only thing that changes is the thickness and surface texture of the system.
Most concrete spalling originates from reinforcement corrosion, not impact. Corroding steel expands in volume and forces the concrete off from the inside. The primary task in repair is not to close the surface but to eliminate the source of the corrosion.
In structural strengthening, the application itself is the second half of the work. The first half is calculating how much capacity increase is needed in which structural element — an engineering decision. What is done on site must conform precisely to the design; even with the correct material, wrong application detail means the strengthening will not deliver the expected contribution.
This work is carried out in accordance with a structural strengthening design prepared by a qualified structural engineer. Calculations and decisions relating to the structural system are the engineer's responsibility.
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