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Nhm Waterhouse Façade
Laser Cleaning
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The Natural History Museum stands as one of the greatest Victorian museums of the 19th century, a Grade I listed landmark whose Waterhouse façade is as iconic as the collections it protects. Every carved creature, every terracotta block, and every sculpted flourish tells a story of Victorian ambition and craftsmanship. Our project set out to conserve this extraordinary façade, with a particular focus on one of the most delicate and technically demanding elements of the programme: laser cleaning.
Client
Science Museum
Location
London
Grade listing
Grade I
Fabric
Lead
Slate
Glass
Terracotta
Brick
A Moving Scaffold for a Living Museum
Working on a building of this scale and significance required an approach as unique as the museum itself. Instead of enveloping the entire façade in scaffolding, the project introduced an innovative rolling scaffold system, designed specifically for this undertaking. This mobile structure allowed only a portion of the façade to be covered at any one time, preserving the museum’s visual presence and ensuring that public access and daily operations continued uninterrupted. As the scaffold glided along the building, each new section of stonework was revealed for conservation, like turning the pages of a monumental architectural book.
Laser Cleaning: Precision on a Historic Canvas
DBR’s conservators underwent specialist training to carry out laser cleaning on the museum’s sculpted elements. Gargoyles, grotesques, drip courses, and heavily stained surfaces were treated with a level of precision that traditional cleaning methods simply cannot achieve. The laser cleaning process gently lifted away layers of sulfation and pollution deposits without penetrating or damaging the historic terracotta and stone beneath. Every pulse of light revealed more of Waterhouse’s original detail, textures, carvings, and expressions that had been dulled by decades of London’s atmosphere.
The Science Behind the Craft
The laser cleaning parameters were carefully calibrated to suit the museum’s historic substrates. Using Restorative Techniques laser equipment, our team worked with sinusoid or flower-shaped beam patterns, full-width scanning, and a laser power of 70%. Cleaning speeds ranged from 100 to 500 mm per minute depending on the intricacy of each sculpted element, while a frequency of 450 kHz and a 500 ns pulse ensured safe, controlled removal of surface deposits. These settings were not arbitrary, they were the result of testing, experience, and a deep understanding of how to protect fragile Victorian surfaces.
A Façade Rediscovered
As each section of the rolling scaffold moved on, the transformation became unmistakable. The façade brightened, details sharpened, and the building’s character re-emerged with renewed clarity. What had once been darkened by time now glowed with the warm tones and crisp carvings that Alfred Waterhouse intended.
This project is more than a cleaning exercise, it is a revival. Through innovation, technical skill, and respect for the museum’s heritage, DBR has helped restore one of London’s most beloved buildings, ensuring its stories continue to be told for generations to come.
