Author of article Dr. Joan-Albert Vinyes
You can paint a wall with moisture, but you need to take a series of precautions to prevent it from deteriorating again over time.
It's important to diagnose the type of moisture present on your walls, floors, or ceilings because the solutions vary greatly depending on the situation.
In general, it's best to eliminate the moisture first and then paint with the appropriate type of paint. However, there are cases where it's urgent to move into a home, and drastic solutions that work must be taken.
1. What happens if you paint over mold?
Painting over a damp wall without proper preparation is a guaranteed failure, and the paint will peel off in no time, no matter the quality or primer used. Therefore, it is essential to kill the mold before painting by doing the following:
- Use a fungicide or spray the mold with a mixture of 4 parts water and 1 part bleach..
- Wait a day and then wipe away the dead mold with a cloth. Be sure not to scrape it, as this could spread mold spores throughout the house, contaminating closets and potentially affecting the respiratory systems of the people and animals living there.
- ● Next, the wall should be treated to ensure that the subsequent renovation is effective.
2. How to properly paint a wall with moisture?
Before starting to paint, it is essential to determine the type of moisture affecting the wall, as the procedure and type of paint are completely different. It's crucial to be very thorough in determining whether the moisture is due to condensation, leaks, capillarity, or a combination of these factors.
2.1 1 Identify the moisture on the wall before painting
The success of the process will only be complete if we correctly identify the Types of moisture affecting the wall.
Each type of moisture whether capillarity, condensation, or leaks requires a different painting process.
2.2 Choose the best paint for your wall
In cases of rising damp which typically appears in lower floors or basements and urgently requires home rehabilitation, several preliminary actions must be taken before painting:
- Kill the mold on the walls using a fungicide or by spraying with a mixture of 3 parts water and 1 part bleach.
- Remove all damp plaster from the wall, chisel it away, and replace it with a 1 cm thick layer of high-quality lime mortar.
- For interior walls, use a silicate-based paint, while exterior walls can be painted with waterproof paint that repels rainwater.
- To complement this process, it is essential to dry the wall using our HS-221, ensuring that the wall is dry before the lime mortar ceases to act as a moisture barrier after about 10 months.
When dealing with moisture caused by condensation, you should remove the mold with fungicides and vent all the water vapor generated from cooking and showering by using extractors in the kitchen and bathroom. The appropriate paint is a thermally insulating paint, which should be applied to the coldest walls of the house.
For moisture caused by leaks , it is essential to fix the water pipe leak or the crack in the wall or ceiling that allows water to enter. Once the wall has dried through intensive ventilation, you can repaint after properly treating the affected areas.
2.3 3 Prepare the wall with moisture before painting
It's necessary to repair damp walls before painting. It's essential to prepare the wall by removing and chiseling away the damaged areas.
It's important to apply paint on a surface free of remnants of previous degraded paint or plaster.
The best results are achieved by following the manufacturer's instructions for both the preparation and application of the paint. However, it's crucial to consider all the guidelines provided for each type of moisture. Painting over a damp wall without following these recommendations will likely result in failure, wasting time and money.
2.4 It's better to eliminate moisture from the wall before painting
It's much more economical and safer to remove the moisture before restoring the wall.
The most efficient and economical drying method for capillary moisture is achieved by installing the HS-221 from Humitat-Stop.
In the case of condensation moistureon the cold parts of the home, you can eliminate it by consistently venting all the water vapor generated from cooking and showering to the outside.
If the moisture is caused by water leaks into the interior, the leaks in the water pipes and corners of the inspection chambers, as well as any existing cracks in the walls and ceilings, must be fixed.
Created by Humitat Stop SL