Do you have damp patches on your walls? You’re not alone. This is a problem that may contribute to mould growing, damage to structures, and an unhealthy living. If you are really curious about how to treat damp walls internally- read on to know its causes and how to prevent them.
You should be able to treat dampness and protect your home in the future after reading this article.
What Causes Dampness in Internal Walls?
Rising damp, condensation, or penetrating dampness are key causes.
1-Rising Damp
The process in which moisture from the ground rises within a wall.
Rising damp can occur due to inefficient damp-proof course (DPC).
The characteristic signs of rising damp include peeling wallpaper, staining, and salt deposits on the wall.
2-Condensation Damp
This occurs when warm air comes in contact with cold surfaces, whereupon moisture is formed.
Condensation damp is more prevalent in homes lacking ventilation.
Evidence includes water droplets, mould formation, and a musty smell.
3-Penetrating Damp
These are generally caused by leakages from the roofs, leaking broken pipes, or bad guttering.
Signs would be damp patches that act up when rain is heavy, wet brickwork.
💡 Pro Tip: It is essential to identify the cause before treating for damp or else you will be trying to cover up a problem without solving it and will only create more issues.
How to Treat Rising Damp on Internal Walls?
1. Damp-Proof Course (DPC) Repair/Installation
A damp-proof course is a waterproof layer in your wall that prevents the ground moisture from rising.
If the DPC is damaged, you will have to:
- Inject a chemical damp-proof course (DPC) into the walls.
- Remove the damaged plaster and replace it once the treatment dries.
Learn more about rising damp by visiting Richard & Starling’s rising damp guide
2. DIY Damp-Proofing Internal Walls
If one prefers to go the DIY way, they may take the following steps:
- Drill holes in the affected wall (following DPC instructions).
- Insert a chemical damp-proof solution to create a moisture-proof barrier.
- Mortar the holes and allow it to dry before replastering.
💡 Professional Tip: Handy DIY solutions may work for light cases, but for serious rising damp cases, it is advisable to hire a damp-proof specialist.
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How to Treat Condensation Damp on Internal Walls?
Condensation is the commonest damp in UK homes, especially in the colder months. Here is what you need to do:
1. Improve Ventilation
- Install extractor fans in kitchens and bathrooms,
- Use dehumidifiers to remove excess moisture in the air.
- Open windows frequently to enhance airflow.
2- Install Anti-Condensation Paint
Anti-condensation paint or damp-proof paint would serve to protect the walls from future damp issues.
3- Insulate Walls & Minimise Cold Spots
- Insulate walls to block condensation on cold surface areas.
- Thermal wallpaper or insulated plasterboard can be used for extra protection.
💡 Did You Know? Using a dehumidifier can substantially decrease condensation damp by keeping indoor humidity levels under control.
View how to decrease humidity levels inside your home.
How to Repair Damp Internal Walls?
The next thing that follows after the solution to the moisture issue will be to carry out repair work.
Follow our step-by-step guide..
A Step-By-Step Guide on how to treat damp walls internally:
1- Removal of plaster: Removal of all crumbling plaster or any plaster showing signs of mould or mildew.
2- Drying of walls: Make use of a dehumidifier or heating to speed up the process.
3- Stain blocker application- This prevents any old stains from surfacing.
4- Plaster the surface- Use moisture-resistant plaster for durability.
5- Painting or decorating: Paint with breathable paint, which would keep the moisture trapped from the inland.
💡 Pro Tip: If the dampness persists post-treatment, it is wise to contract a professional for a detailed inspection.
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How to Deal with Damp Walls Before Painting?
Repainting walls without proper damp treatment can cause paint decay and blistering. Here is what to do:
Steps to Prepare Walls for Painting:
- Ensure walls are completely dry – You may need to use a moisture metre.
- Use damp-proofing primer – This will stop water from entering the surface.
- Use moisture-resistant paint- These are special anti-mould paints that work best.
Dealing with Internal Damp Walls Professionally
If the damp is persistent or particularly severe, it is best to call in a damp-proofing specialist.
When to Call in a Professional?
- DIY measures do not get to the root but more damp spots appear.
- The causes also include structural problems within the property; such as cracks and leakage, or superficial.
- Rising damp affecting the majority of rooms in the house.
Damp Proofing Cost
Damp proof course injection: £400 – £850
Replastering & redecorating: £300 – £600
Survey professional for damp: £150 – £300
💡 View Dehumidifier Hire services.
Conclusion
So, the next time you ask yourself- how to treat damp walls internally? you should be aware that it depends on what type of damp is affecting your property. Use damp-proof courses where the dampness is caused by rising damp, whereas condensation damp is usually solved with improved ventilation and insulation.
But if you deal with damp development in your building walls, you must seek help from a professional for a longer-term solution.