Dry a cellar professionally


The basement is a major problem for many homeowners. Not infrequently, a wet or at least damp cellar causes a lot of frustration. This has long been a field of work that even do-it-yourselfers deal with. Therefore, we have put together valuable and interesting information for drying a cellar for you.

Reasons for a wet cellar

Historically, a cellar is basically wet. Until the last decades of the 20th century, imperfect seals kept causing trouble. Up until the 1990s, it was mostly not enough protective seals, but today there are still building defects that lead to damp and wet cellars.

There used to be no seals

The problem with damp cellars came up here only in the second half of the 20th century. At that time, homeowners' claims changed dramatically. Basement space should be converted into living space, efficient seals at the same time catching the increasingly expensive energy costs.

The house construction is accordingly effective

Building a house is a sophisticated system that matured over centuries. Wetness always rises up into the masonry. Because it could not be sealed for many centuries, the moisture had to be removed accordingly. Many small factors play together here.

  • Cellars that are well ventilated (missing or not really sealing cellar windows)
  • Wooden windows in the living floors, which are also not completely air and gas tight
  • vapor-permeable walls (paint, plaster, masonry, exterior plaster, façade paint equally)
  • Roofs that ventilate well (cold roof constructions)

Drying the basement starts at the rest of the house

If one of these factors is changed, the most severe mold can result, as the entire building ventilation no longer works. So it is also extremely important that you check your house for ventilation when you want to dry your basement. Especially with older houses you will not get your basement dry, if the remaining ventilation of the house is not guaranteed to the extent necessary.

Ways to dry the cellar

When drying the cellar, you do nothing else than a seal. This is done in two different ways.

  • vertical sealing
  • horizontal sealing

Only if you make these seals, the basement masonry can dry. Otherwise, water will always rise in the walls. But the way the water gets into the walls is also crucial.

  • only immediately after heavy rainstorms
  • by rainwater that does not or hardly escapes from the ground
  • by pressing up groundwater

The horizontal drying

For this they have to decouple the house from the ground. This is done by a barrier layer is introduced at the latest between the first and second row of stones. In modern homes, the entire bottom surface is sealed. If you want to seal the walls so, for example, stainless steel or high-quality bitumen is used. Since badly the whole house can be raised at the same time, each wall is sealed horizontally piece by piece and thus dried.

The vertical sealing and drying

When sealing vertically, a protective layer or several layers are applied from the outside. Since this task can also be combined with thermal insulation measures, perimeter insulation is often carried out simultaneously.

  • masonry
  • Plaster outside (must be removed often)
  • on the previously weeks long drying masonry comes a barrier and primer
  • special P3 plaster
  • bitumen coating
  • Perimeter insulation (often also polystyrene)

In addition, the drainage around the house can be checked on this occasion, since the cellar masonry must be exposed to the house base.

Tips & Tricks

You can not compare modern bitumen waterproofing with the tar waterproofing of the past. The modern systems are very durable and durable bitumen products, which are, among other things, treated with plastic. Injections into the basement wall are only recommended if the masonry is no longer wet. The drying would therefore have to be done in advance anyway, for example, by a horizontal seal. Compared to this drying, the efficiency of injections is a maximum of 70 to 80 percent.

Of course you will find many more articles in the house journal about the cellar. For example, to expand the cellar.


Video Board: How To Hang Drywall on Walls