The drainage of rainwater must be the subject of a separate circuit in the arrangement of the evacuations of a particular house or pavilion. However, it is good, economical and citizen to first provide a recovery unit for domestic use (car washes, garden watering, etc.) The spreading of these waters, away from the walls, makes it possible to avoid disadvantages related to the constant humidity that maintains their natural evacuation. The market makes available to the individual units of materials complying with the standards imposed by the DTU in terms of rainwater evacuation. The heavy rainfall, which seems to be renewing itself, justifies this problem being seriously studied and treated.
- Bubble level
- Causes of residual moisture
- Wastewater evacuation
Causes of residual moisture
Although it is common in the countryside, rainwater is discharged by a natural spreading, this process is often cause of residual moisture from the bottom of the walls and which only needs to go back by capillary action.
It is the same downspouts when not connected to a look. Of course, it is necessary to reseal leaks, but in the absence of evacuation connection, the effects produced are also harmful to the walls of the house. The ease of implementation of collection manholes in concrete or PVC, when they have no weight to bear, justifies their use, especially since they include inputs and outputs provided with pre-cut lids. In addition, they have extensions and lids full (so-called "pedestrian") or grill and can also serve as siphon.
Gathering lines, gutters and protection grilles are essential to keep away and collect rainwater from the proximity of the walls. In the presence of concrete or tiled exterior surfaces, plan for recovery gutters at the bottom of the slope or yard siphons capable of collecting water from the heaviest showers.
After digging a trench adapted to the size of the prefabricated gutter, make the mortar assemblies respecting a slope of 3 to 5 cm per meter. Cast iron or PVC gutters avoid making mortar. It can be attached to all types of births to adapt to evacuation lines according to their position. Their grids, metal or reinforced PVC, can be gray or sand.
Connect the buried pipelines and gutters equipped with grids, to the collection points to form a line of evacuation of rainwater, quite distinct from other circuits. You will be able to reinforce the tightness of the joints by joints of silicone sealant as effective on the PVC of the pipes as on the concrete of the looks.
The general line of evacuation of rainwater is buried in a trench. It can have several connections, tees of derivation or looks. Trench standards for the passage of power lines are adapted to rainwater trenches: depth of 0.60 m, raised to 1 m under vehicular traffic areas. It is however preferable to use concrete nozzles under the running areas. In this case, plan for PVC / fiber cement adapter sleeves. Electrical conduits must be at least 0.20 m apart.
The buried line, placed on a bed of 10 cm of sand, will first be covered with a layer of identical sand before receiving its embankment. Extend as much as necessary to reach a spray area or sewer connection.
To be effective, the evacuation line must respect the same slope of 3 to 5 cm per meter. Complete the ditching of the trench after placing a red colored (neither electricity) and yellow (gas) signaling grid with the cleared earth to open the trench. However, make sure that the embankment (according to the standard) "must be purged of all elements likely to damage the pipes and their ability to compact...". This means, in plain language, that the largest stones must be removed from the embankment or rough sieved if the embankment is heavily stony.
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