Mould in your Ibiza finca: health risks and lasting solutions

Mould is a common problem on Ibiza — especially in fincas, older properties, and homes that stand empty for long periods. Many people see it as a cosmetic issue solvable with a quick clean. Nothing could be further from the truth. Mould is a serious health risk and a sign of underlying damp problems that can structurally damage your home.

Why is mould such a problem on Ibiza?

The Ibiza climate creates ideal conditions for mould:

• High humidity: 60–85% year-round, peaking in winter.
• Mild temperatures: rarely below 8–10°C even in winter — perfect for mould growth.
• Poor ventilation: traditional fincas often have small windows and limited air circulation.
• Unoccupied periods: second homes closed for months are especially vulnerable.
• Underlying damp: mould only grows where there's enough moisture — often a sign of something worse.

The health risks

Mould is no innocent problem. Spores spread through your entire home via the air and can lead to:

• Respiratory issues: coughing, shortness of breath, worsening asthma.
• Allergic reactions: sneezing, itchy eyes, skin rash.
• Chronic fatigue with prolonged exposure.
• Headaches and concentration problems.
• For vulnerable groups (children, elderly, immunocompromised) serious lung problems can develop.

Some black mould species — like Stachybotrys chartarum — produce mycotoxins with even more serious consequences. This black mould thrives in chronically damp environments.

Which species do we see most often?

1. Cladosporium (green-black)

By far the most common. Grows on cold walls, windowsills and behind furniture. Often causes allergic reactions.

2. Penicillium (blue-green)

Visible on wet materials like carpets, wallpaper, wood. Spreads quickly.

3. Aspergillus (yellow-green)

Found in dusty environments with moisture. Some variants produce toxins.

4. Stachybotrys (black, slimy)

The most dangerous. Found in heavily affected, long-term wet spots — often behind walls or under floors. Always requires professional handling.

Why painting over doesn't work

A common mistake: wiping mould off with bleach and painting over with "anti-mould paint". This approach is patchwork at best:

• Bleach kills the visible part, but roots remain.
• Spores stay present and spread when ventilating.
• Anti-mould paint only works superficially and loses effectiveness within 6–12 months.
• The underlying damp source isn't addressed — mould returns.

Our 4-step approach

Step 1: Source analysis

We first investigate why the mould is growing. Possible causes:

• Leakage (roof, pipe, drain)
• Rising damp in the wall
• Condensation from poor insulation or ventilation
• Hygroscopic salt drawing moisture from air

Step 2: Containment & removal

We isolate the contaminated zone with plastic sheeting and use HEPA air filters during work to prevent spore spread. We fully remove affected materials — no half measures.

Step 3: Anti-fungal treatment

We treat all affected surfaces with professional anti-mould products that penetrate deep into materials. Not just the surface — the root structure is eliminated.

Step 4: Eliminate the cause

Removing mould is only half the job. We make sure the cause — damp, poor ventilation, thermal bridge — is solved permanently. Only then is the problem truly gone.

Special challenge: unoccupied second homes

Many international owners visit their Ibiza home only weeks per year. Meanwhile:

• No ventilation happens — humid air stagnates
• Indoor humidity rises to 80%+
• Walls stay cold — perfect for condensation
• Small leaks go unnoticed and can run free for weeks

For this situation we often install an autonomous climate system: mechanical ventilation with humidity sensor that ventilates automatically when humidity rises too high. Switch it on when leaving — return to a fresh, dry home.

Prevention: what you can do

• Ventilate 10–15 minutes daily — even in winter.
• Use a dehumidifier when humidity is >65%.
• Don't place furniture flush against cold exterior walls — leave 3–5 cm for air circulation.
• Check regularly: behind furniture, in corners, under windows, in cellars.
• React quickly at first signs — small mould patches are relatively simple; large infestations require major remediation.

When to call professional help?

Get help immediately for:

• Mould patch larger than 1 m²
• Black mould (possible Stachybotrys)
• Mould in bedroom or children's room
• Returning mould despite cleaning
• Mould behind walls or under floors
• Health complaints in the home

Need help?

Start with our free online pre-analysis — send photos, we assess remotely and advise. For serious situations we visit on location for an Expert Analysis.