Curtain Wall Inspection Singapore — Drone Glazing & Facade Assessment

What Is Curtain Wall Inspection?

A curtain wall is the lightweight, non-load-bearing external envelope that hangs off a building's structural frame. Unlike a masonry wall, it carries only its own weight and the wind and seismic loads acting on it, transferring those forces back to the floor slabs through a grid of aluminium mullions and transoms. Because a curtain wall is essentially a skin of glass, metal and sealant suspended dozens of storeys above the street, its condition is a direct public-safety matter — and inspecting it well demands more than a general visual walk-around.

Curtain wall inspection is the systematic assessment of that glazed envelope: the glass, the framing, the joints that seal it, and the concealed brackets that hold it to the structure. In Singapore it forms part of the mandatory Periodic Facade Inspection (PFI) regime under the Building Control Act, which requires the entire external facade of qualifying buildings to be professionally examined at regular intervals. Curtain walls sit at the centre of that obligation because so many of Singapore's commercial towers, hotels and newer condominiums are fully glazed.

What makes curtain walls distinct from a plastered or tiled facade is that most of their critical components are hidden or difficult to reach. A failing structural silicone bond, a perished gasket, or a blocked drainage cavity gives little warning at street level, yet any of these can allow water into the building or, in the worst case, allow a glass pane to work loose. A dedicated curtain wall inspection is designed to surface exactly these hidden failure modes before they become incidents.

Why Curtain Walls Need Specialist Facade Inspection

Singapore's climate is unusually severe on glazed facades. Sustained high humidity, intense ultraviolet exposure, monsoon-driven wind and rain, and a daily thermal cycle all attack the materials that keep a curtain wall watertight and safely fixed. Silicone and gaskets harden and shrink under UV; aluminium framing expands and contracts every day, working the joints; and wind-driven rain finds any weakness in the weather line. Over a 15- to 30-year service life these stresses accumulate into the defects a facade inspection is meant to catch.

Curtain walls also manage water differently from solid walls. A well-designed system is not simply "sealed" on the outside — it uses pressure-equalised drainage cavities and weep holes to control any water that gets past the outer line and drain it back out. When gaskets fail or weep paths block, that drainage stops working and water is driven into the building interior. Diagnosing this requires reading the system as a whole, not just spotting cracked sealant, which is why generic facade checks often miss curtain wall problems until staining appears indoors.

Finally, the consequence of failure is severe. A detached glass pane or spandrel panel falling from height in a dense urban environment is precisely the risk the PFI regime exists to prevent. Structural sealant glazing and mechanical anchorage are therefore inspected with particular care, because their failure modes are the ones that put people below at risk.

Curtain Wall Defects We Detect

Our inspections are structured around the specific ways glazed envelopes deteriorate. Each defect is identified, photographed, mapped to a facade grid and mullion reference, and passed to your competent person for classification.

How Drone Curtain Wall Inspection Works

We inspect curtain walls under BCA's TR 78 technical reference for drone-based facade inspection, which sets the camera, flight and reporting standards a compliant inspection must meet. A drone flies pre-planned paths across every elevation, holding a consistent standoff so that image scale and overlap stay uniform from the podium to the crown of the building.

Two capabilities run in parallel. High-resolution visual capture resolves the fine detail that matters on a glazed wall — the condition of structural and weather sealant, gasket state, surface cracks, edge delamination and staining — across panels that rope-access teams could only reach a fraction of. Radiometric thermal imaging then adds what the eye cannot see: failed IGU seals, moisture trapped behind spandrel panels, air leakage at joints and water ingress tracking behind the cladding line all register as distinct thermal patterns.

The advantages over traditional rope access on a curtain wall are decisive:

• Complete coverage — every panel on every elevation is imaged, not just the vertical drop-lines an abseiler can reach on each descent.
• No contact, no risk — the glazed skin is never loaded by climbers or anchors, and there is no work-at-height exposure for inspectors.
• Hidden-defect detection — thermal imaging finds seal and moisture failures that a visual-only survey would miss entirely on a curtain wall.
• Traceable evidence — every finding is geo-tagged and mapped, giving your competent person a precise, auditable record for the BCA submission.

After capture, the imagery is assembled into a full facade mosaic. Each defect is annotated, described and located to a panel reference, then compiled into a data package your competent person uses to produce the professional assessment and PFI report.

Curtain Wall Systems We Inspect

Curtain walling comes in several forms, each with its own detailing and characteristic failure points. Our methodology adapts to the system on your building.

Curtain Walls Under Singapore's PFI Regime

Under the Building Control Act, buildings more than 13 metres tall that obtained their Temporary Occupation Permit more than 13 years ago must undergo periodic facade inspection every 7 years. That obligation covers the whole external facade — the curtain wall is not a separate or optional element. When BCA issues a facade inspection order, the appointed competent person must assess the glazed envelope alongside every other cladding type on the building.

Curtain wall findings are classified using BCA's three-category system. Minor cosmetic issues such as light staining are Category 1 (monitor). Progressive problems like gasket failure and localised water ingress typically fall into Category 2 (repair within a set timeframe). Structural sealant bond loss, anchorage failure, cracked or detached glass — the defects that threaten falling debris — are Category 3, requiring immediate rectification and, where necessary, protective canopies. Complete, defect-mapped drone data lets your competent person make those calls with confidence and defend them in the BCA submission.

Why Choose SG Drone Inspections

We are a specialist drone facade inspection provider in Singapore, focused on delivering the accurate, fully-mapped data that competent persons need to sign off complex glazed facades.

Frequently Asked Questions