Seal the damp basement wall from the inside

A damp basement wall can be easily sealed from the inside. However, this method is not suitable for every type of moisture. But if sealing from the outside is not possible, this can be a good solution.

Defective or missing sealing of the masonry

In the area in which the wet soil covers the outer walls of the cellar, moisture can easily penetrate if the walls are not sufficiently insulated from the outside.

However, it is not always possible or necessary to tackle this problem from the outside. Even a sealing of the basement wall from the inside is quite effective.

Seal the damp basement wall from the inside: wall

Sealing plaster can be applied inside

There are various products for sealing the basement wall from the inside. Sealing slurry or sealing plaster is probably the most effective way to seal the wall from the inside.

However, one must keep in mind that the wall will continue to be penetrated by moisture. It just can not escape into the interior. So if you have the opportunity to apply a sealant from the outside, you should definitely do that.

Step by step, seal the basement wall from the inside

  • Sealing putty
  • Sealing plaster / sealing slurry
  • spatula
  • brush
  • trowel
  • brush

1. Prepare walls

The walls must be prepared very thoroughly. If possible, you should either ventilate thoroughly before the action or try to dry the room and walls with a fan heater.

Brush the walls well and remove loose plaster with a spatula. If you have a very old cellar with multi-limbed walls, you must try to scrape those white layers all down.

2. Coving between wall and floor

The transition between the floor and the wall requires special treatment. Here you should put on a groove, in order to be able to carry out the transition later better. This ensures the particularly moisture-sensitive floor transitions.

3. Apply sealing plaster

The sealing plaster must be applied over the entire surface as dry as possible. Depending on what the manufacturer has planned for strength, you should apply the sealing plaster accordingly strong. Always wear gloves, as many of these sealing plasters can be very damaging to the skin.

For some products, it is also possible to use thermal insulation in the form of a plate in addition to the sealing plaster.

Tips & Tricks

Whatever system you choose, you should always stay with additional products within the same system in order to perform various seals on the bottom and walls of the basement.

Otherwise, the transitions between different products could become a new problem as the products might react to each other and not connect as desired.

Video Board: Waterproofing Basement Walls with DRYLOK® Paint -- by Home Repair Tutor