ThermoCeil

Overview

The Royal Albert Hall's auditorium ceiling is finished in fibrous plaster — a lightweight composite of gypsum, hessian and timber that became widespread in the late nineteenth century. Its structural components are hidden from view, and current inspection relies on invasive, labour-intensive methods constrained by access and safety. ThermoCeil tests High-Resolution Infrared Thermography (HRIRT), accessed through the E-RIHS MOLAB platform, as a non-invasive alternative for revealing concealed construction and early deterioration.

Motivation & challenge

Hessian wads, timber laths and thickness variations sit behind a finished plaster surface, prone to ageing, moisture ingress and detachment. Left undetected, these issues can lead to cracking, delamination or collapse. Conventional endoscopic surveys and opening-up works are slow, disruptive and often restricted by height or hazardous materials.

Methodology

A five-day campaign combines HRIRT imaging with a LiDAR survey for spatial context and Portable Nuclear Magnetic Resonance Relaxometry (PNMRR) for moisture validation. Thermal data is processed through filtering, transient analysis and Principal Component Analysis, then overlaid on the LiDAR model to distinguish genuine anomalies from expected construction features.

Expected impact

ThermoCeil aims to establish a transferable protocol for rapid, repeatable, non-invasive ceiling surveys — reducing reliance on scaffolding and mobile platforms, and improving safety and evidence-based conservation decisions for theatres and heritage buildings across the UK and Europe.