This way you keep the basement free of water

Large rainfall can be a major challenge for the house drainage. Here are the advice.

This way you keep the basement free of water

The problem of water in the basement is often the fact that the ground around the buildings is unable to handle extreme amounts of surface water.

– We realize that in large amounts of precipitation, so much surface water accumulates on the ground, that it can drain into the house and give water pressure to the wall , says Senior Advisor at Sintef Byggforsk, Jan Chr. Krohn.

Water pressure against the wall will increase the risk of water penetration in the basements.

Krohn says that it also happens that sewer pipes fail to take away the water, resulting in a setback which can cause people to get water into the basement room with a swallow.

In general, all surface water is removed from the house walls, and this is when this does not work that the problems most often occur .

Wastewater drainage

According to the State Building Technical Bureau (BE), water from roof drainage is one cause of moisture damage.

“Water from roof drainage exceeds the capacity of a regular house drainage and is a common cause of moisture damage. This water must therefore always be disposed of in its own pipeline or on terrain, “says the agency’s Compendium House and Health.

What you can do is to connect a flexible pipe to the outlet from the roof rack and place this pipe a bit on the ground, describes Krohn in Building Research.

In this context, he refers to the Building Researcher’s publications. Moisture protection of buildings and Local surface water management.

If the ground conditions are still around the house, the roof water will eventually return towards the house, a more sustainable solution must be established.

For example, it is possible to construct a separate piping system, as described, for example, in Vi in villa.

Cutting drainage

This way you keep the basement free of water

CLEANING DRENERATION: In case of falling into the house, a so-called intersecting drainage can be established, as indicated at the right of this drawing, Photo: Ill: Facsimiles from the Building Researcher

This way you keep the basement free of water

SCREENING GRAPH: Principle sketch of a trench for cutting drainage. Photo: Ill. : Per Chr. Tellefsen

This way you keep the basement free of water

TERRENGFALL: The terrain will fall out of the house, as illustrated here. Photo: Ill: Per Chr. Tellefsen

Building rules (Technical Regulations §8-37) state that surface water must be discharged from the wall of the house.

In many cases, the opposite is true; the water flows into the wall of the house. And when there are large amounts of rainfall, the risk increases considerably in order for water to enter the building.

It’s hard to do anything about the terrain in retrospect, but what you can do where there is a sloping terrain down the house is to add a so-called intersecting drainage a few meters from the wall of the house, says Jan Chr Krohn.

Such drainage will capture water that is heading towards the wall of the house.

Read also: Moisture in the basement

Primer plastic

Good protection of the foundation is also an important part of the drainage problem. In the Guidelines for Technical Regulations, paragraphs 8-37 state that the walls underground must have water repellent surfaces, which may, for example, be ground-welded plastics.

However, the primer must be properly installed if it has any effect.

– If there is no ground plastic, you have at least a problem, emphasizes Jan Chr Krohn.

– It’s important that it goes above ground level and does not make it happen.

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New drain

According to Krohn, houses built before the 1970s will eventually have to replace the drainage.

Many of them can be built without satisfactory drainage, others may have drainage systems that eventually get close.

Krohn therefore believes that owners of older homes should be aware of this issue.

– Drainage systems 40 to 50 years old will be ripe for replacement and renewal.

Read also: Paint the house as a pro


Do you have problems with the drainage around the house but do not feel like you have Knowledge enough to handle it yourself, it may make sense to obtain expert help.

First and foremost, there are machine contractors who can perform assignments to install or upgrade the drainage around the house.

On Click Offering Services. No, you can get help to collect price estimates for the work to be done.

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