Glass Facade Inspection Singapore — Drone Glazing & Safety Glass Assessment

What Is Glass Facade Inspection?

Glass facade inspection is the close assessment of the glazing itself — the panes of glass that make up a building's transparent and opaque envelope — as distinct from the aluminium framing that holds them. Where a curtain wall inspection looks at the whole system of mullions, transoms, sealant and anchorage, a glass facade inspection focuses on the material properties and failure modes of the glass units themselves: whether each pane is intact, whether safety glass is still performing, and whether sealed units are still doing their job.

The scope is broad. It covers the clear vision glass you see through, the opaque spandrel glass that conceals floor slabs and services, glass balustrades and Juliet balconies, glazed canopies and entrance features, and overhead glazing such as skylights and atrium roofs. Each of these uses glass differently, and each carries a different consequence if it fails. Because glass is brittle, unforgiving and — when it breaks at height — genuinely dangerous to people below, its condition is a core concern of Singapore's periodic facade inspection regime.

Getting this right requires understanding glass as a material, not just as a surface. Two panes that look identical from the street can be entirely different products with entirely different risk profiles. A proper glass inspection reads what type of glass is present, how it is likely to fail, and what evidence of that failure is visible or thermally detectable across the elevation.

Glass Types and Why the Difference Matters

Architectural glass is not a single material. The type used on any part of a facade determines how it breaks, how much warning it gives, and how much of a hazard the fragments become. A meaningful inspection accounts for all of them.

• Annealed glass — ordinary float glass, cooled slowly. It breaks into large, sharp shards and is rarely used where impact or human loading is likely. On older facades it may appear in areas that today would require safety glass.
• Heat-strengthened glass — roughly twice as strong as annealed and more resistant to thermal stress, but it is not a safety glass; it breaks into large fragments. Commonly used for spandrel panels where thermal loads are high.
• Toughened (tempered) glass — heat-treated to around four times the strength of annealed and designed to shatter into small, relatively blunt cubes. Its hidden weakness is spontaneous breakage from nickel-sulphide inclusions.
• Laminated glass — two or more panes bonded with a polymer interlayer (typically PVB or SGP). This is the true safety glass: when it breaks, the fragments stay adhered to the interlayer, so the pane holds together rather than falling. Its performance depends entirely on the interlayer remaining intact.
• Insulated glass units (IGUs) — double- or triple-glazed assemblies with a sealed, gas-filled cavity for thermal performance. Their weak point is the perimeter edge seal, not the glass surface.

The practical significance is that the same visible crack means very different things depending on the glass. A cracked laminated balustrade may still be holding safely; a cracked annealed canopy is an immediate hazard. Reading the glass type correctly is what lets a competent person grade the risk accurately.

Glass Defects We Detect

Our inspections are built around the specific ways glass deteriorates and fails. Each pane is imaged, each defect identified, located to a facade grid reference, and passed to your competent person for classification.

Why Glass Defects Are a Safety Matter

The reason glass sits so high on a facade inspector's priority list is simple: broken or detaching glass falling from height is one of the most serious hazards a building envelope can present in a dense city like Singapore. When a toughened pane shatters spontaneously, or when a cracked annealed unit lets go, fragments fall onto the pavement, entrance canopies and podium areas below.

Laminated safety glass exists precisely to manage this risk — its interlayer holds the broken fragments in place so the pane does not shed. But that protection depends on the interlayer being sound. Delamination, especially at exposed edges where moisture and UV attack the bond, quietly erodes the very property that makes the glass safe. A delaminated laminated balustrade may look fine yet no longer retain its fragments if struck. This is why interlayer condition is inspected as carefully as the glass surface itself.

Under BCA's facade categorisation, cracked, shattered or detaching glass — and failed laminated retention on balustrades or overhead glazing — are the kind of defects graded Category 3, requiring immediate attention and, where warranted, protective hoarding or canopies until rectified. Surfacing these before they become incidents is the whole purpose of the inspection.

How Drone Glass Inspection Works

We inspect glass facades under BCA's TR 78 technical reference for drone facade inspection, which sets the image, flight and reporting standards a compliant survey must meet. A drone flies pre-planned paths across every elevation at a consistent standoff, so image scale and overlap stay uniform from the podium glazing to the crown of the building — capturing every pane, not just the ones an abseiler can reach on each drop-line.

Two capabilities work together, and on glass their strengths are distinct. High-resolution visual capture resolves the fine detail that matters on glazing — hairline cracks, chipped edges, laminated delamination haze at pane perimeters, surface scratches and coating degradation — across panels that traditional rope access could only sample. Radiometric thermal imaging then does something the eye cannot: because a failed IGU has lost its insulating gas and low-E performance, it reads as a distinct temperature against the intact units around it, so failed sealed units and trapped moisture or condensation in cavities map cleanly across an entire elevation, even where glare defeats a visual check.

The advantages over rope access on a fully glazed building are decisive:

• Every pane covered — 100% of the glazing on every elevation is imaged, so no unit is skipped between drop-lines.
• No contact, no risk — the glass is never loaded by climbers or anchors, and there is no work-at-height exposure for inspectors.
• Thermal detection of sealed-unit failure — IGU seal failure and cavity moisture are found thermally, which a visual-only survey cannot reliably do through reflection.
• Traceable evidence — every defect is geo-tagged and mapped to a pane reference, giving your competent person a precise, auditable record for BCA.

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

Types of Glazing We Inspect

Glass appears on a facade in many roles, each with its own detailing and characteristic risks. Our methodology adapts to the glazing in front of us.

Glass Facade 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. Glass is not a separate or optional element of that duty — all glazing, from vision glass to balustrades to skylights, is part of the external facade the appointed competent person must assess when BCA issues an inspection order.

Glass findings are graded on BCA's three-category system. Minor surface scratching or light staining is typically Category 1 (monitor). Progressive issues such as IGU seal failure or early edge delamination usually fall into Category 2 (repair within a set timeframe). Cracked, shattered or detaching glass, and failed laminated retention on balustrades or overhead glazing, are Category 3 — immediate rectification, with protective measures where public areas are exposed below. Complete, pane-by-pane drone data lets your competent person make those calls confidently and defend them in the BCA submission.

Why Choose SG Drone Inspections

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

Frequently Asked Questions