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Terrace: prevent and treat water infiltration

The terraces are areas particularly exposed to the weather and, as such, prone to water infiltration. Wear, embrittlement of joints between the slabs, ground movements, frost, heavy rains can be responsible for these disorders. Several signs must alert and signal the need to proceed quickly with work.

Infiltrations on a terrace: Prevention is better than cure

When designing a terrace, it is imperative to pay special attention to thesealing of the slab and / orwaterproofing of the surface. Subsequently, good maintenance helps to minimize the risk of water infiltration and is the best treatment against this type of problem.

Maintain daily
By regularly removing dead leaves, plants and small debris that accumulate on the terrace, we ensure its good general condition. A clean and unobstructed terrace is a terrace on which it will be easier to spot the warning signs of possible infiltration.
Maintain regularly
Once or twice a year, it is recommended to carry out a thorough cleaning of the terrace. In this way, the surface of dirt and mosses can be cleaned with a scrubber and soapy water, manually or with a pressure washer equipped with a rotating brush head. Avoid the direct use of a high pressure cleaner nozzle which may remove the waterproofing layers or weaken the joints.
Call a professional for waterproofing treatments
Although most of the waterproofing and waterproofing products on the terrace are available in DIY stores or on the Internet (including professional products), a deterioration of the waterproofness of the slab of a terrace requires the use of to a professional. If the house or structure is less than 10 years old and the terrace is an integral part of the construction (it must not be separated from it), it is possible to use the ten-year guarantee. It is then necessary to play the damage insurance.
Prevent stagnant water
To avoid seepage, it is also essential to avoid water stagnating on the terrace for an extended period. For this, it is necessary both to build the terrace so that a natural slope allows the water to flow on the ground and it is necessary to use elements of the type of gutter (screened or not) and pipelines to evacuate the water.

Spot a water infiltration

To find a water infiltration quickly, it is necessary to regularly inspect the surface of the terrace looking for cracks or an unusual concentration of moss and / or lichen. By identifying cracks early enough, it is possible to intervene and minimize the damage. If one does not intervene, the water infiltrates under the terrace, stagnates, deteriorates it and risks, eventually, to go up in the walls of the house by capillarity or to degrade the ceiling of the room possibly located below.
Several solutions are possible:

  • fill in cracks with a specific sealant, after having eliminated all the parts no longer adhering to the support,
  • apply a sealing resin on the entire terrace after filling the larger cracks and cleaning the entire surface.

The problem of infiltration on roof terraces

In certain detached houses or collective buildings, it is common that the terrace also plays the role of roof. In this type of configuration, water infiltration under the deck can very quickly cause significant damage in the lower rooms. It is therefore imperative to ensure that the roof terrace is watertight and well maintained over time.

Accessible and mobile rooftop terraces
Again, we must be vigilant and watch for the first signs of infiltration. On a rooftop terrace, leaks occur most of the time near the rainwater collection and evacuation points. Gutters, pipes and evacuations are therefore to be carefully monitored. They should not be clogged and they should properly drain the water away from the deck. The corners are also conducive to water stagnation and plant development. These places are to be observed with care and to clean regularly.
Non-accessible roof terraces
On non-accessible rooftop terraces, it is necessary to plan an annual (or even biannual) maintenance by a professional. Poor maintenance being the first cause of leakage by infiltration, periodically redoing (every 10 years, for example) the tightness of this kind of structure is an investment in the long term.
Guarantees and insurance
By making the waterproofing of a terrace (consubstantial of the frame) every 10 years, by a professional, it remains under ten-year guaranteecovered by theproperty damage insurance. This is particularly important in the case of a roof terrace. In all cases, remember that the consequences of a leak of terrace on lower rooms are covered by the clause "water damage" of comprehensive home insurance, subject, of course to do the necessary work to end. On the other hand, the works themselves are not taken into account by the insurance.

On the same topic

  • Questions answers
    • How to waterproof a roof terrace?
    • How to renovate the tightness of a terrace?
    • How to improve the waterproofness of a slab?
    • Is it normal for water to stagnate on a flat terrace?
    • How to evacuate stagnant water on a terrace?
    • Infiltrations in a terrace
    • Waterproof an outdoor terrace
    • Reinforce a terrace weakened
    • Problem of terrace tiles raised and cracked by frost
    • Paved terrace waterproofing problem
  • DIY tips
    • Sealing of a terrace with a liquid membrane
    • Waterproofing a roof terrace
    • Maintenance of a terrace: dirt, moss, bursting materials
    • Wall and terrace waterproofing

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