The Problem with Conventional Inspection Reports
For decades, the commercial roofing sector has struggled with sub-standard inspection reports. A typical report might feature fifty low-resolution photographs with generic captions such as "corrosion observed on south pitch" or "split lap joint near air handler." When roofing remediation contractors receive these reports to generate quotes, they waste hours wandering across vast roof planes trying to locate the specific defects depicted, or they pad their pricing contingencies to account for spatial uncertainty.
We reject this disjointed workflow. We treat industrial roof mapping with the geometric precision of land surveying. By combining real-time kinematic (RTK) drone telemetry with Ground Control Points (GCPs), our orthomosaic base maps are spatially calibrated to within 20 millimetres of actual terrestrial location. Every defect is logged as a distinct spatial vector entity containing rich attribute metadata.
Our Defect Classification Matrix
To allow estates directors to prioritise maintenance interventions systematically, we categorize every observed condition issue using a strict 5-tier severity classification scheme:
| Severity Grade | Operational Definition | Representative Defect Examples | Recommended Action Window |
|---|---|---|---|
| Class 1: Critical Emergency | Active water ingress or immediate safety hazard to building occupants. | Punctured membrane over switchgear, loose metal sheets threatening wind blow-off, shattered non-fragile skylight. | Immediate intervention (0–48 hours) |
| Class 2: Severe Concern | Advanced envelope breakdown where ingress is imminent during next adverse weather event. | Severely delaminated lap joints, unseated mechanical fixings on parapet copings, choked main siphon outlets. | Targeted repair within 14–30 days |
| Class 3: Moderate Degradation | Measurable physical deterioration that is compromising component lifespan. | Surface cut-edge rust on sheet end-laps, early-stage ponding (>25mm depth), surface crazing on GRP skylights. | Incorporate into quarterly work order |
| Class 4: Minor Cosmetic | Aesthetic or superficial weathering without immediate threat to water tightness. | Superficial scratching of coating, minor biological lichen growth on flashings, light gutter debris build-up. | Routine annual scheduled servicing |
| Class 5: Informational | Physical baseline note for long-term monitoring and asset history. | Previous contractor patch repairs performing well, redundant penetration brackets safely capped. | Log into digital twin asset file |
Digital Layering & Contractor-Ready Scopes
When our engineering team delivers defect documentation, it is organized into discrete digital layers. Facilities management teams can toggle layers depending on whether they are conducting an executive capex review or dispatching an external trade contractor:
- Structural & Drainage Boundaries: Outlining primary pitch directions, internal valley gutter centerlines, expansion joints, and downpipe discharge nodes.
- Photogrammetric Inspection Points: Interactive vector pins that open high-resolution 100% crop photography, thermal radiance metrics, and physical dimensions of the specific defect.
- Quantified Bill of Quantities (BoQ) Layer: Automatic calculations of linear meterage of gutter clearing required, exact counts of replacement fasteners needed, and square meterage of membrane patch overlays.
Enhancing Insurance & Warranty Verification
Structured defect mapping serves an equally vital legal and commercial function. During property transaction due diligence (dilapidations assessments) or insurance disputes following extreme windstorm events, disputes frequently arise regarding pre-existing wear versus storm-induced damage.
Having a timestamped, millimeter-accurate geospatial record removes all ambiguity. Property owners can prove beyond doubt that their roof was free from loose flashings or unmaintained gutters prior to an event, safeguarding warranty coverage from single-ply and composite panel manufacturers and expediting insurance settlements.