Sign #2: Rust Stains and Orange Streaks on the Exterior

If you notice reddish-brown or orange streaks running down the surface of your building’s exterior walls, do not dismiss them as simple dirt or water marks. Rust stains on a building facade are one of the most reliable early warning signs of a condition commonly known as concrete cancer — a progressive and potentially dangerous form of structural deterioration.

Here is what is happening beneath the surface: reinforced concrete buildings use steel rebar inside the concrete to provide tensile strength. When moisture penetrates through cracks, failing sealants, or porous concrete, it reaches that steel reinforcement and triggers corrosion. As the steel rusts, it expands — often to several times its original diameter — creating enormous internal pressure that pushes outward, cracking and breaking the surrounding concrete. The rust bleeds through to the surface, creating the telltale orange staining you can see from the ground.

In the UAE, this process is dramatically accelerated by the coastal environment. Salt-laden air from the Arabian Gulf is rich in chloride ions, which are particularly aggressive in attacking steel reinforcement. Buildings in coastal areas of Dubai — Jumeirah Beach, Dubai Marina, JBR, Palm Jumeirah — and throughout Abu Dhabi and Sharjah’s waterfront zones are especially vulnerable.

What to do: Rust staining is never a cosmetic issue alone. It signals active corrosion that will only worsen over time. Engage a specialist facade team to conduct a full structural assessment, identify the extent of rebar corrosion, and carry out appropriate concrete repair, rebar treatment, and resealing.

Sign #3: Spalling, Flaking, or Chipping Concrete

Spalling is the physical breakdown and detachment of concrete from a building’s surface. You may notice chunks of concrete missing from balcony edges, column faces, slab soffits, or exterior walls. You might see concrete surfaces that appear to be blistering, bubbling, or delaminating — peeling away in layers. In advanced cases, you may actually find fragments of concrete on the ground below the building.

This is an urgent safety issue. Falling concrete debris poses a direct physical danger to anyone below — pedestrians, vehicles, and neighbouring properties. In a densely developed city like Dubai, where buildings adjoin footpaths, retail areas, and busy roads, even a small piece of falling concrete can cause serious injury or death.

Spalling in the UAE is accelerated by the same combination of factors that drives rust staining: moisture ingress, rebar corrosion, and the expansion forces generated by corroding steel. The process feeds on itself — cracks allow more water in, which causes more corrosion, which causes more cracking and more spalling.

Beyond safety, spalling that is left unaddressed will continue to spread across the facade, eventually compromising the structural integrity of the affected elements. Repair costs escalate dramatically the longer intervention is delayed. A small, localized repair today may prevent a full facade restoration project in the future.

What to do: If you observe spalling on any part of your building’s facade, contact a certified facade repair specialist immediately. The area should be assessed by rope access or elevated platform to determine the full extent of damage. Repair typically involves removing all loose and compromised concrete, treating exposed rebar with rust inhibitor, and applying appropriate repair mortars and protective coatings.

Sign #4: Water Leaks, Damp Patches, and Water Ingress

Water ingress through the facade is one of the most damaging and one of the most commonly overlooked signs of facade failure. You may notice damp patches appearing on interior walls or ceilings — particularly on upper floors — after rainfall. You may see efflorescence, a white powdery deposit that forms when water moves through concrete or masonry and carries dissolved salts to the surface, leaving them as a residue when it evaporates. You may notice mould growth on interior surfaces adjacent to external walls.

In the UAE, water ingress through facades tends to occur in specific ways:

• Failed silicone sealant joints between glass panels, around window frames, and between cladding sections are among the most common entry points. Silicone sealants have a finite service life and degrade under UV radiation, heat, and building movement. Once a sealant joint fails, it becomes a direct channel for water penetration.
• Cracked or porous render and external coatings allow moisture to be absorbed directly into the facade substrate.
• Blocked or poorly designed drainage details allow water to pond at critical interfaces and force its way inward.

Even in a climate as arid as the UAE’s, water ingress is a serious problem. Dubai experiences intense, short-duration rainfall events — particularly between November and March — during which large volumes of water fall quickly. A facade with even minor failures in its weatherproofing system can allow significant water penetration during these events.

What to do: Identify the source of the water ingress — which is often not directly above the visible damp patch, as water tracks along structural elements before appearing inside. A thermographic inspection can reveal hidden moisture behind facades. Remediation typically involves silicone sealant replacement, waterproofing membrane repairs, and external coating restoration.

Sign #5: Failing or Deteriorated Silicone Sealants

The silicone sealant joints that seal the gaps between glass panels, between glass and aluminium frames, and between curtain wall sections are the unsung heroes of a building’s facade. They keep water out, prevent air infiltration, accommodate building movement, and maintain the thermal performance of the exterior envelope. And they have a lifespan.

In the UAE’s climate, silicone sealants are under exceptional stress. UV radiation at this latitude degrades sealant polymers relatively quickly. High temperatures cause building materials to expand and contract more aggressively than in temperate climates, placing greater strain on sealant joints with every thermal cycle. Coastal salt air accelerates the degradation of sealant adhesion to glass and aluminium substrates.

Signs that sealant joints need urgent attention include:

• Visible gaps where sealant has pulled away from the glass or frame
• Cracking or splitting along the sealant bead
• Discolouration — sealants turning yellow, grey, or black (the latter often indicating mould growth within a compromised joint)
• Softness or tackiness — sealant that has lost its structural integrity
• Bubbling — indicating moisture has been trapped beneath the sealant surface

Sealant failure is often invisible from street level on a high-rise building, which is precisely why regular rope access inspections are so valuable. An IRATA-certified technician rappelling the facade can examine every joint up close, identify early failures, and address them before they become a source of major water damage.

What to do: Commission a comprehensive sealant inspection by qualified rope access technicians. Failed sealant should be removed fully — not simply over-coated — and replaced with an appropriate high-performance silicone system that meets UAE climate requirements.

Sign #6: Loose, Cracked, or Displaced Cladding Panels

Modern commercial buildings in Dubai and across the UAE frequently use glass, aluminium composite material (ACM), natural stone, or ceramic tile as cladding systems. These materials offer impressive aesthetics and, when properly installed and maintained, excellent performance. But they are attached to the building structure via a system of brackets, fixings, and framing — and those fixings can fail.

Signs of cladding system distress include:

• Visible gaps between panels that were not part of the original design
• Panels that appear to have shifted from their original alignment
• Rattling or movement observed during windy conditions
• Cracked, broken, or missing panels
• Visible corrosion on exposed fixings or framing
• Water staining running from specific joints or panel edges

Displaced or loose cladding is an immediate safety hazard. A panel that has partially detached from its fixing system can become a falling object projectile in strong wind conditions — a scenario that, in Dubai’s built environment, has potentially catastrophic consequences.

The UAE experiences strong seasonal winds, particularly the Shamal — a northwesterly wind that blows across the Gulf region and can cause significant wind loads on high-rise building facades. A cladding system that is already compromised may not withstand these wind events.

What to do: Any observed cladding movement, gap, or damage should trigger an immediate inspection. Depending on the cladding type and fixing system, remediation may involve re-anchoring loose panels, replacing broken or damaged sections, and resealing all perimeter joints.

Sign #7: Paint Peeling, Blistering, or Fading

While paint failure may initially seem like a purely cosmetic issue, it is actually a significant warning sign that should not be dismissed. External paint systems on UAE buildings serve multiple functions beyond aesthetics — they protect the substrate from UV radiation, moisture absorption, and chemical attack. When the paint system fails, the underlying substrate is directly exposed to the environment.

Common signs of paint system failure in the UAE context include:

• Peeling or flaking — paint detaching from the substrate in sheets or fragments
• Blistering — bubbles forming beneath the paint film, indicating trapped moisture
• Chalking — a fine powdery residue on the surface caused by UV degradation of the paint resin
• Widespread fading or discolouration — indicating that the paint’s UV resistance has been exhausted

In Dubai’s climate, even high-quality exterior paint systems have a finite service life under constant UV bombardment and thermal cycling. Buildings that were painted more than 5–7 years ago may be approaching the point at which their paint system is no longer providing adequate protection.

Blistering is particularly noteworthy because it typically indicates that moisture is present behind the paint film — either absorbed through the substrate or as a result of water ingress through cracks or failed joints above. This makes it not just a paint failure but a symptom of an underlying moisture problem.

What to do: A thorough assessment should determine whether the failure is purely a paint system issue or whether moisture in the substrate is the root cause. Simply repainting over a wet substrate will result in immediate re-failure. Substrate moisture must be addressed before any new coating system is applied.

Sign #8: Bird Droppings, Nesting, and Biological Growth

In the UAE, buildings are increasingly affected by bird activity — particularly pigeons, which nest in gaps, ledges, and mechanical penetrations in the facade. While bird activity may seem like a nuisance issue rather than a structural one, the consequences for facades are more serious than many building owners appreciate.

Bird droppings are highly acidic and corrosive. Over time, accumulated droppings on ledges, window sills, facade surfaces, and within sealant joints attack and degrade the materials on which they sit. They also create unattractive staining that is difficult to remove once it has had time to work into porous surfaces.

Nesting materials block drainage channels and weep holes, causing water to pond and find alternative — and unintended — paths into the building.

Biological growth — algae, mould, and lichen — can also establish itself on facades, particularly on north-facing elevations or in shaded areas where moisture persists. Like bird droppings, biological growth is mildly acidic and can attack both the surface coating and the underlying substrate over time.

In the UAE, pest bird problems have grown as urbanisation has provided abundant nesting opportunities in the canyon-like gaps between buildings.

What to do: Professional cleaning of affected areas by rope access technicians, followed by installation of appropriate bird deterrent systems — spikes, netting, or wire systems — can arrest the problem. Any substrate damage caused by droppings or nesting should be repaired as part of the same programme.

Sign #9: Glass Damage, Discolouration, or Seal Failure

Glass is the defining material of the UAE’s modern skyline. In a glass-dominated building, the performance of the glazing system is directly linked to the building’s energy efficiency, waterproofing integrity, and visual appearance. Signs that the glazing system needs attention include:

External glass damage: Chips, cracks, or scratches on glass panels compromise both the structural performance of the glass and, in the case of thermally toughened or laminated safety glass, may render the pane unsafe. Cracked or chipped glass in a high-rise facade should be assessed and replaced promptly — not only because of the safety risk of further breakage at height, but because even small cracks propagate under thermal stress.

Misting or condensation between double-glazed panes: This is a clear indicator that the edge seal of an insulated glass unit (IGU) has failed. When the hermetic seal breaks, humid air enters the cavity between the panes, condenses, and leaves visible fogging or mineral deposits. A failed IGU has lost most of its thermal insulation value and should be replaced.

Hard water staining: One of the most common glass issues in the UAE is the build-up of mineral deposits — calcium and magnesium salts from evaporated water — on glass surfaces. In its early stages, this appears as a slight haze or white spots. Left untreated, these deposits etch into the glass surface and cannot be removed by standard cleaning methods. Regular professional cleaning prevents permanent glass damage.

What to do: Glass damage assessment and replacement requires access by trained technicians using rope access or elevated work platforms. IGU replacements should be carried out using equivalent or upgraded glass specifications, with appropriate sealant work to ensure the new unit is fully weathertight.

Sign #10: Structural Deformation — Bowing, Bulging, or Settlement

The most serious sign of facade distress is visible structural deformation — walls, panels, or structural elements that are visibly out of plane, bowing outward, bulging, or showing signs of uneven settlement. While less common than the other signs listed in this guide, structural deformation represents an urgent situation that requires immediate professional structural engineering assessment.

Causes of structural deformation in UAE buildings can include:

• Differential settlement of building foundations, particularly in buildings constructed on reclaimed land or areas with variable ground conditions
• Thermal bow in concrete elements caused by differential expansion between sun-exposed and shaded faces
• Expansion forces from corroding rebar pushing outward on the facade
• Inadequate or failed structural connections between the facade system and the main building frame

Any building showing visible structural deformation should be treated as potentially unsafe until a structural engineer has confirmed the nature and severity of the issue. In severe cases, temporary propping or evacuation of affected areas may be necessary pending full assessment.

What to do: Contact a licensed structural engineering firm immediately. Do not attempt to continue normal building operations in close proximity to areas showing structural deformation without professional clearance.