6 Causes of Damp to Check Before Calling a Builder
Damp Patches Inside Your Home? 6 Causes to Investigate Before Calling a Builder
At Avanti SW Ltd our builders have seen it all when it comes to damp issues in homes. From minor condensation problems to large-scale structural concerns, moisture indoors can often feel like a headache waiting to happen. The good news? Not every damp patch signals a major problem. Before you pick up the phone to call a builder, there are steps you can take to understand the cause of the issue - and potentially address it yourself.
Here, we break down six common causes of damp patches inside your home. By knowing what to look for, you’ll be better equipped to take action and avoid unnecessary repairs.
1. Condensation – A Common Culprit
Condensation is one of the most frequent causes of damp patches in homes, especially during colder months. It occurs when warm, moist air meets a cold surface like a window, wall, or ceiling, leading to water droplets forming and potentially soaking into surfaces.
What to check for:
- Are damp patches appearing in areas with limited ventilation, such as bathrooms or kitchens?
- Do you notice condensation on windows or mirrors during the day?
How to address it:
Try improving ventilation. Open windows, use extractor fans, or invest in a dehumidifier. Condensation is often more about managing your home’s airflow than requiring structural repairs.
2. Leaking Pipes
A hidden pipe leak can easily cause damp patches to develop, particularly on walls or ceilings. Even a minor leak can cause moisture to accumulate over time.
What to check for:
- Is the damp located near plumbing, such as beneath sinks, behind washing machines, or above bathrooms?
- Are there water stains or peeling paint in these areas?
How to address it:
Turn off the water supply and inspect the piping in the area. This might require a plumber to confirm the source of the leak but catching it early can minimise damage.
3. Roof Damage or Blocked Gutters
If moisture is coming from above, your roof, gutters, or downpipes could be the issue. Blockages or damage can allow rainwater to seep into your home and travel through walls or ceilings.
What to check for:
- Are the damp patches located on ceilings or high walls?
- Have you noticed missing roof tiles, overflowing gutters, or rainwater not draining properly?
How to address it:
Check your guttering and downpipes for blockages like leaves or debris. If roof tiles are missing or damaged, a professional inspection may be necessary to assess the full extent of repair needs.
4. Rising Damp
Rising damp happens when moisture from the ground travels up through a property’s walls. It’s more common in older homes and can lead to damage if left untreated.
What to check for:
- Is there a tide mark or discoloration low on the walls, usually no higher than a meter from the floor?
- Is plaster crumbling, or are there signs of salt deposits (white powdery residue)?
How to address it:
This issue usually requires professional intervention. A builder can investigate the condition of your damp-proof course - a key barrier to keeping ground moisture out - and recommend repairs or upgrades if needed. Please note that some properties built before 1875 may not have a damp proof course but we can check this when we take a look for you.
5. Penetrating Damp
Penetrating damp occurs when moisture enters through external walls, often due to poor maintenance or damaged brickwork. It’s common during heavy rains when water finds its way into cracks or porous surfaces.
What to check for:
- Are damp patches located on exterior-facing walls?
- Do they worsen after rainfall?
How to address it:
Inspect your home’s exterior for cracked render, loose pointing, or gaps around window frames. Resealing or repairing these areas might solve the issue. If the brick or missing mortar damage is extensive, our professional builders can carry out more substantial repairs to protect your property. It might be beneficial to remove any cement mortar and repoint with lime mortar depending on the walls construction and age.
6. Faulty Windows or Doors
Another potential entry point for water is poorly fitted or aging windows and doors. Over time, seals can weaken, frames can shift, and water can sneak through.
What to check for:
- Are damp patches located directly beneath windows or near door frames?
- Have you noticed drafts, damaged seals, or visible gaps?
How to address it:
Replacing seals or adjusting window frames might help as a quick fix. However, if your windows or doors have reached the end of their lifespan, investing in quality, modern replacements will improve not just moisture resistance but energy efficiency too. Please note that in some conservation areas, such as Bath in Somerset, Lacock in Wiltshire or Windrush in the Cotswolds, you may need to check any exterior changes to buildings, which includes windows and doors.
When to Call the Experts
While some damp issues can be resolved with a little detective work and quick fixes, others signal deeper structural concerns. If you’ve ruled out easy solutions or the problem persists, calling in professional help is the next step.
At Avanti SW, our builders are experts at remedying the causes of damp in properties and resolving them with solutions that last. With decades of experience and an unwavering commitment to quality, you can trust us to restore the comfort and integrity of your home.
Solve your damp problems today
Damp patches don’t have to lead to sleepless nights. By understanding the possible causes and addressing them promptly, you can protect your property and your peace of mind. If you’re unsure or need expert advice, please call either Mark or Danny, here at Avanti SW Ltd – your local Wiltshire builders.
Contact us today for a building refurbishment quote or advice on how to solve your damp problems. Together, we’ll ensure your home is in the best condition, free from the worry of damp and moisture concerns.