Rising damp on Ibiza: causes, symptoms and the lasting solution
On Ibiza, rising damp is one of the most common — and most underestimated — structural problems. Especially in older fincas, traditional village houses, and even some newer buildings, we encounter it regularly. In this article we explain what rising damp is, why it's such a major issue on Ibiza, and most importantly — how to fix it permanently.
What exactly is rising damp?
Rising damp is groundwater that's drawn upward through the pores of walls by capillary action. It's similar to how a sponge soaks up water: the water 'climbs' against gravity, sometimes up to 1.5 meters or more.
In well-built modern homes this is prevented by a damp proof course (DPC). This horizontal barrier inside the wall stops groundwater rising further. The problem: many older Ibiza homes don't have this layer.
Why is Ibiza especially vulnerable?
Four factors make Ibiza a challenging area:
1. Building history
Many traditional Ibiza homes were built before 1980, often without a DPC. Authentic fincas with thick walls of piedra y barro (stone and clay) function well in dry periods, but allow moisture through once the ground becomes saturated — for example after heavy autumn rains.
2. Climate
Ibiza has a Mediterranean climate with humidity averaging 60 to 85% year-round. October — the wettest month — averages 49 to 69 mm of rain. Combine that with porous walls and no water barrier, and you have a recipe for problems.
3. Salt content
Sea influence brings salt into the groundwater and air. When this salty water rises and evaporates at the wall surface, the salt remains. These salt crystals are highly hygroscopic — they attract moisture from the air. The problem amplifies itself.
4. Groundwater level
Especially in lower parts of Ibiza — for example along the coast from Sant Joan to Es Caná — groundwater levels are relatively high. This significantly raises pressure on foundations.
How to recognise rising damp?
- A 'tide-mark' or damp line: a horizontal, often dark yellow or brown line on the wall, typically between 80 cm and 1.5 m high. Above this line the wall is dry; below it, damp.
- White salt crystals (efflorescence): white powdery deposits on the wall surface, especially at or below the tide-mark.
- Peeling paint and plaster: paint detaching, plaster crumbling, wallpaper falling off.
- Musty smell: a typical, earthy odour — especially in lower parts of the home, near skirting boards or in cellars.
- Discoloured furniture: wooden furniture against walls may stain or even warp.
- Mould at the base of walls: along skirting or floor-wall joints.
Why 'temporary' fixes don't work
When owners call us in, several things have usually been tried:
- Painting over with damp-proof paint — this hides the problem but solves nothing. The moisture is still in the wall.
- A new plaster coat — without addressing the cause, it falls off again within a year.
- Plasterboard cladding — hides the problem. But mould behind the board grows on, and the structure suffers more damage.
- Dehumidifiers — provide relief but don't address the cause. Switch it off and the damp returns.
For rising damp, you must intervene at the source: stopping capillary action in the wall itself.
The CasaDry solution: chemical injection
The gold standard in modern damp control is chemical injection with silicone cream. Here's how our method works:
Step 1: Diagnosis
We measure exact moisture levels at different heights with a professional moisture meter. We identify where the wall is dry and where it's wet. We determine wall thickness and composition.
Step 2: Preparation
We drill a row of holes (10 to 12 mm diameter) at a fixed height (usually 10 to 15 cm above floor level). Spacing between holes is typically 10 to 15 cm.
Step 3: Injection
We inject a special silicone cream under pressure into each hole. The cream spreads horizontally through the wall pores and forms an invisible hydrophobic (water-repelling) zone — a new DPC.
Step 4: Sealing
We seal the holes with waterproof mortar that blends seamlessly with the wall.
Step 5: Drying period
The wall above the injection line now dries out. Depending on wall thickness this takes 6 to 18 months. During this period no new moisture can rise from below.
Step 6: Plaster restoration
When the wall is dry enough, we apply a special salt-resistant plaster and the wall can be finished again.
Does this work on thick finca walls?
Yes. This is exactly where our experience counts. Traditional Ibiza fincas have walls 50 to sometimes 80 cm thick. For these we use:
- Higher injection pressure and larger volumes
- Special creams developed for thick, heterogeneous walls
- Often two-sided injection where the wall is accessible on both sides
We've applied this technique to numerous fincas in Sant Joan, Sant Llorenç and the inland areas of Santa Eulària.
How long does the treatment take?
The actual injection of an average finca takes 1 to 3 days. Plaster restoration follows the drying period (6 to 18 months later) and takes another 2 to 5 days.
What does it cost?
The investment depends on:
- Length of affected walls (charged per linear meter)
- Wall thickness
- Accessibility (crawl space, cellar)
- Damage extent — does plaster also need replacing?
For an average villa we charge between €3,000 and €8,000. Full finca restoration with multiple walls can run up to €12,000.
Our guarantee
At CasaDry we offer a comprehensive guarantee on all injection work. Does the problem return within the guarantee period? We come back free of charge. Exact terms come in writing with your quote.
Ready to solve your damp problem permanently?
Book a free online pre-analysis or an Expert Analysis on location. We'll review your situation and give honest advice — no sales pitch, just expertise.
