Every year we face the same problems and uncertainties. Will the roof leak this spring? Will moisture appear on the walls again? How can I prevent heat from draining out of the windows in winter? What should I do about that pool of water that forms at the entrance of the house?
When buying a house, it is important to check carefully for areas that may be unprepared to deal with rain and low temperatures. You won’t want any moisture seeping into the structure of the house. A general rule of thumb: the older the house, the greater the likelihood of seepage. It can be hard to know where to start when you want to remove moisture from walls, so we put this small guide together to help you fix this common problem.
Tools and materials you’ll need
- Orbital sander
- Paint tray
- Steel brush
- Moisture blocker
- Anti-moisture coating
Moisture in the walls usually occurs when they absorb moisture from the floor. It is most often found on the first floor of a house and occurs because of errors in the waterproofing of the foundation.
Remove moisture from walls
1. Repairs for moisture on exterior walls
➞ Before applying a product to remove moisture from walls, it is essential to take off any paint or loose materials. For this step, you can use your spatula and orbital sander.
➞ Once removed, it is necessary to use a steel brush to remove any salt that may have appeared with the humidity. Then rinse the wall with water.
➞ To prevent moisture from penetrating the wall again, a moisture blocker must be applied. This product is applied with a brush, and it is usually recommended that you apply two coats.
2. Repairs for moisture on interior walls
➞ To eliminate moisture on indoor walls, use the same cleaning procedure described for exterior walls above except you will beading some chlorine to the water.
➞ Leave the water-chlorine mixture on the wall for a few minutes to totally eliminate any mold. Then, rinse the entire surface with water.
➞ There are preventative fungicide/mold coatings that react on contact with moisture, leaving an impermeable layer that allows the walls to breathe and moisture to come out. You should apply yours carefully, and then you’re finished!
Don’t want to remove moisture from walls again?
To prevent moisture from entering your house, consider the following:
- Protect foundations with impermeable films or geotextiles
- Build waterproof concrete foundations up to 40 inches in height
- Place the rain drainage far from the foundations
- Do not build gardens near the foundations
- Waterproof the exterior of the walls up to a height of at least 20 inches
- For perimeter walls that receive constant water or humidity from a garden or irrigation system, it is recommended that you add a barrier against humidity, which usually consists of a layer of polystyrene adhered to a plasterboard
- Do not build on low and permanently humid terrain