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Treat the walls against moisture

When a wall is wet, it is impossible to consider the slightest decoration work. First of all, we must find the origin of moisture. Then it must be treated by dehumidification, heating, ventilation, application of a water-repellent product, etc. Without these treatments, your decorating work will deteriorate quickly, and you will have to start all over again.

Necessary material

  • Hard brush
  • Special product against moisture
  • Basting brush or roller
  • Knife to coat
  • Drill
  • Neoprene adhesive
  • Flat brush
  • Spatula

Damage to moisture

Damage to moisture

1. On a damp wall, the paintings blister and peel, eventually falling. Wallpapers are degrading and peeling off. When the walls are wet and covered with saltpeter or efflorescence, the appropriate solution must be found. First, try to reduce the cause of moisture. It is often rather flagrant: roof leaks, gutters or descents, cracks in the facade. Sometimes it is less obvious: condensation, leakage of a pipe, capillary rise, etc.

Brushing the wall

Brushing the wall

2. Once you have corrected the causes of humidity (by repairing pipes, gutters, descents, filling facade cracks, waterproofing foundations, resin injections, etc.), you can treat the surface of the interior walls. If moisture continues to seep in, problems will reappear later. With a stiff brush, start by scraping all the parts of the wall concerned.

Application of a water-repellent product

Application of a water-repellent product

3. When efflorescence or saltpeter has been removed, allow the plaster to dry. Ventilate and strengthen the heating of the room. Switch on an electric dehumidifier. Apply on the wall a product against moisture (water repellent), trade. Apply the product with a whitewash brush, paint roller or sprayer. Treat very widely, even if the humidity is limited and do not affect the entire wall. Pass two layers of product.

Coating repair

Coating repair

4. Allow to dry for at least two days before applying the repair coating. In case of capillary rise difficult to treat from the outside with a sealant on the foundations, you can fight against the humidity by the injection of liquids based on silicone and resin. These products infiltrate the pores of masonry and solidify in contact with moisture.

On the same topic

  • DIY tips
    • How to evacuate moisture after a flood?
    • How to properly treat the humidity of a wall?
    • Whitish traces of saltpetre on the walls
    • Wallpaper or paint coming off
    • Fight against moisture and mold stains on walls and ceilings
    • Humidity in a cellar
    • Protection of a brick facade
    • Injection wall treatment
    • Treatment of humidity in a cellar
    • Laying wallpaper
    • Laying of thin insulation (Dépron)
    • Wallpaper: Metallic
    • Coat window seals
    • Re-sealing cracks in the plaster
    • Re-sealing a wall with a coating
  • Questions answers
    • How to treat a tuff wall against moisture?
    • What to do against the appearance of mold on an interior wall?
    • VMC's problems and Housebrico's advice to solve them
    • Painting the walls of a flaking cellar
    • How to solve a problem of droplets in the crawlspace?
    • Infiltrations of water in a garage: how to find the origin?
    • Remove moisture from a wall with an insulating liner
    • How to repair a degraded plaster coating?
    • How to solve a problem of humidity in a cellar?
    • How to treat the inner side of a mud wall?
    • How to overcome capillaries?
    • Who to contact to solve moisture problems?
    • How to get rid of mold?
    • How to solve a saltpetre problem?
    • How to paint on Depron?
    • Repair an agglo wall with thin insulation mounted against a damp wall
    • Why is the painting of my interior walls blistering?
    • How to avoid wet walls?
    • Crystal moisture absorbers in a stone house
  • Forum
    • Is Aquapol damp wall treatment reliable?
    • Hair lifts
    • Moisture in bearing walls

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Video Instruction: How to make Damp Proofing Walls by one simple step.