The Best Facade Rehabilitation Techniques in Ibiza

Few facades work as hard as the ones in Ibiza. They take strong sun for most of the year, salt-laden sea air, wind carrying dust and sand, and autumn storms that arrive all at once after months of dry weather. Many homes on the island also have stone or marès walls finished in lime, a system that performs well when it is respected and deteriorates quickly when it is treated like a concrete block wall.

That is why the best facade rehabilitation technique is not a single product but a sequence: understand what is happening to the wall, fix the cause, and only then choose materials and finishes. This guide walks through each stage as we approach it on Ibiza villas, from the first inspection to the last coat of lime.

Start with a diagnosis, not a product

Many facades that fail again within a few years were not badly built; the symptom was repaired and the cause was left in place. A proper facade diagnosis in Ibiza looks at least at the following:

The substrate. Rubble stone, marès sandstone, concrete block and reinforced concrete absorb and release moisture differently, and each accepts some mortars and not others.
The layers on top. It is common to find original lime hidden under several coats of plastic paint added over the years. Knowing what lies underneath changes the whole approach.
The condition of the render. Tapping the surface reveals hollow-sounding areas where the render has come away from the wall even though it has not yet fallen.
Where the water comes from. Rising damp from the ground, water entering through roofs, wall copings or poorly resolved junctions, or condensation from inside. Each source needs a different fix.
Salts and cracks. Their type, their pattern and whether they are still active.

With that information we draw up a defect map of the facade and decide which areas are repaired, which are rebuilt and which only need cleaning and protection.

Cracks and fissures: what they tell you and how to repair them

Treating every crack with the same filler is one of the most common mistakes in facade remedials.

Surface crazing in the render

Fine cracks, often in a network pattern, that only affect the outer coat. They usually come from shrinkage while the mortar dried, from curing too quickly in the sun, or from a render that is stiffer than the wall behind it. They are opened slightly, cleaned and filled with a mortar compatible with the existing render. If the network is extensive, it is usually better to re-render that section.

Cracks at junctions between materials

These appear where materials that move differently meet: stone and concrete, an old wall and a modern extension, lintels, floor slabs. Filling is not enough here. The repair includes a reinforcing mesh embedded in the render to spread the stress on both sides of the joint, and a mortar with suitable flexibility.

Cracks that are still moving

A crack that runs through the wall, keeps growing or opens diagonally from the corners of doors and windows may point to a structural issue. Before closing it, you need to know whether it is active, which means installing tell-tales and monitoring it. Sealing a crack that is still moving only guarantees it will reopen. In these cases the diagnosis should include an assessment by a qualified technician.

Cracks with rust stains in concrete

On balconies, pillars, overhangs and slab edges it is common to see cracks with rust stains or pieces of concrete breaking off. This is the sign of corroding reinforcement, a process the marine environment accelerates, as we explain in the invisible shield: how to protect your building. The correct repair is to remove the damaged concrete until the steel is exposed, clean it, apply a passivating treatment and rebuild the section with a structural repair mortar. Covering the crack from outside leaves the problem working inside.

Salt damage and efflorescence in a coastal climate

On a villa near the sea, salt is part of life for a facade. It arrives with sea spray, rises with ground moisture or comes out of the mortars themselves. When water evaporates at the surface, the salt crystallises and leaves white deposits on plinths, around windows and under copings.

This is not only cosmetic. As salt crystallises inside the pores, it pushes the material apart and eventually breaks down the render and soft stone.

Treatment depends on the type of salt. Carbonates can be brushed off dry; sulphates need mechanical removal and the source cut off; chlorides, the most common near the coast, need repeated washing with water and, in heavily loaded walls, poultices that draw the salt out of the material. Our guide to salt efflorescence on coastal walls explains how to tell them apart.

What never works is covering salt with waterproof paint. Moisture gets trapped behind it, salts keep crystallising under the film, and the paint blisters and peels, often taking part of the render with it. If the salt is rising from the ground, the solution also involves stopping capillary rise at the base of the wall and letting the facade dry out.

Facade cleaning: from the gentlest method upwards

Cleaning is the most underestimated part of the rehabilitation of a facade, and the one that can do the most harm if the wrong method is chosen. The rule is simple: always start with the least aggressive method that solves the problem, and test it first on a discreet area.

Low-pressure water and a soft brush. Enough for dust, surface salt and general dirt on most whitewashed facades.
Steam or hot water. Useful for grease, organic residue and stubborn dirt without punishing the surface.
Biocide treatment. For algae, mould and lichen, which appear mainly on north-facing walls and in areas shaded by vegetation. The damp that feeds them also needs addressing.
Specific cleaning agents. Only when the stain justifies it, and with products compatible with the substrate.

High-pressure washers and abrasive blasting, on the other hand, are a bad idea on marès, sandstone and lime render. They strip the surface layer, open the pores and leave a more absorbent facade that gets dirty sooner and holds more water and salt.

Lime renders and mortars in traditional Ibizan architecture

Traditional Ibizan facades were built with thick stone walls, rendered and whitewashed. The logic is clear: the wall takes in moisture and releases it outwards, and lime allows it to do so. As we describe in our article on traditional Ibizan construction, many of today’s problems come from renovations that broke that logic with cement and plastic paints.

Why lime is still the right choice for older walls

Lime mortar is breathable: it lets water vapour out and stops moisture being locked inside the wall. It is more flexible than cement, so it follows small movements in the masonry without cracking so easily. A cement render on an old stone wall does the opposite: it creates a rigid, impermeable crust that pushes moisture and salts towards the weakest points.

How a good lime render is applied

Substrate preparation. Hollow areas and incompatible mortars are removed, joints are cleaned out and the wall is dampened before application.
Successive coats. A key coat, a body coat that levels the surface and a finer finishing coat, each applied once the previous one has firmed up enough.
Slow curing. Lime hardens slowly and needs moisture to do it well. In Ibiza that means shielding the render from direct sun and wind, avoiding the hottest hours in summer and keeping it damp for the first few days.
Limewash. The traditional finish goes on in several thin coats rather than one thick one, which tends to craze and flake.

On exposed stone walls the same principle applies to repointing: lime mortar, in a colour and texture that blend with the original masonry.

Protection and water-repellent treatments

Once the facade is sound, clean and dry, it needs protecting from rain without sealing its pores. This is done with breathable silane or siloxane water repellents, which penetrate the material and repel liquid water without forming a film, so vapour can still escape. The appearance of the facade barely changes.

Three conditions make the difference:

Apply it to a substrate without active salts. On a salt-loaded wall, crystallisation happens just below the treated layer and the surface ends up spalling.
Apply it when the wall is dry, so the product can penetrate.
Choose a product suited to the substrate, because stone, lime render and concrete behave differently.

No product replaces good detailing. Copings with an overhang and drip edge, window sills that throw water clear, downpipes that do not discharge onto the wall and a plinth that keeps splashback away protect a facade more than any treatment. For the indoor side of the problem, see managing humidity in Ibiza homes.

Finishes: lime, mineral paint and a Mediterranean look

The finish is what you see, and also the first line of defence. On Ibiza facades we work mainly with two families:

Lime paints and limewash. The natural choice for traditional houses and stone walls. They stay breathable, age gracefully and are easy to renew.
Mineral silicate paints. They bond chemically with mineral substrates, are breathable and remain very stable under strong sunlight.

Plastic and acrylic coatings have their place on some modern substrates, but on old walls or walls with a history of damp they tend to cause problems. Then there is the aesthetic side: lime white, the earthy tones of inland fincas, the texture of the render or a combination with exposed stone. Respecting that language is part of doing the job properly.

How we approach facade rehabilitation at IBOSSIM

At IBOSSIM, all facade work is carried out from certified scaffolding. It gives full, stable access to every section, precision on renders and junctions, and safety for people and the property. Our usual sequence:

Visit and diagnosis. Facade inspection, defect map and identification of the sources of moisture and salt.
Technical proposal. What is repaired, what is rebuilt, with which materials and which finish, explained clearly.
Scaffolding and site protection. Garden, pool, terraces and joinery are protected before work begins.
Phased execution. Cleaning, removal of unsound material, crack repair, rendering, protection and finish, respecting the drying and curing times of each material.
Final review and maintenance. Advice on keeping the facade in good condition and periodic checks, especially for homes by the sea.

You can find full details of the service on our facade rehabilitation in Ibiza page.

Frequently asked questions about facade rehabilitation

What does facade rehabilitation in Ibiza involve?

A complete job usually includes diagnosis, cleaning, removal of hollow or crumbling areas, crack repair, salt treatment, new render where needed, water-repellent protection and the finish. In Ibiza it also means checking the details that keep water off the wall and choosing materials compatible with traditional masonry.

What are the best facade rehabilitation techniques?

The ones that start from a correct diagnosis and use materials compatible with the substrate. On stone and marès walls, lime renders, lime finishes and mineral paints perform better than cement and plastic paints. On concrete elements with corroded reinforcement, the right technique is a structural concrete repair, not simply filling the crack.

What are facade remedials?

It is a common term for the repair work that puts a facade back in good condition: fixing cracks, replacing failed render, treating salt and damp, repairing spalled concrete and renewing protection and finishes. Good facade remedials always address the cause of the damage as well as its visible effects.