Paris – France

When safety requirements meet irreplaceable heritage — Webnet at the heart of Paris’s most watched restoration

In April 2019, the world watched Notre-Dame Cathedral burn. The spire collapsed. The vaulted ceiling was breached. The cathedral that had stood for over 850 years was suddenly in crisis — and the challenge of bringing it back was handed to some of France’s most accomplished heritage architects and engineers.

When the scaffolding went up and restoration work began, one question ran through every decision: How do you secure a monument this fragile without damaging it further?

The Problem With Protecting Irreplaceable Things

Heritage restoration isn’t just an engineering problem. It’s a negotiation between what safety authorities require and what preservation authorities will allow. At Notre-Dame, authorities needed vertical and horizontal fall protection across several sensitive areas — the Galerie des Chimères, the South Tower, and the Cour des Citernes — while maintaining the visual integrity of Gothic stonework that no craftsman alive today fully knows how to recreate.

Standard safety barriers were out of the question. Steel tubes and rigid nets would have been too heavy, too intrusive, and structurally incompatible with surfaces that couldn’t take additional point loads. The solution needed to be light, flexible, authority-approved, and — critically — visually subordinate to the cathedral itself.

Jakob Webnet: Approved, Adaptable, Invisible in Plain Sight

Jakob Rope Systems was brought in as a subcontractor to Baudin Châteauneuf, working under the project management team of architects Philippe Villeneuve, Pascal Prunet, and Rémi Fromont — all Architectes en Chef des Monuments Historiques (ACMH), the highest heritage designation in France.

The specification centered on Webnet with sleeves, a configuration that adds structural rigidity to the mesh without increasing visible mass. Two configurations were deployed across the site:

• 20261-0200-120 (mesh 120 mm, rope Ø 2 mm) — for zones requiring lighter, wider coverage
• 20256-0300-060 (mesh 60 mm, rope Ø 3 mm) — for zones requiring finer containment
• All exposed Webnet: burnished, RAL black finish — matching the patinated stone tonally

Scope by zone

Why This Project Matters Beyond Paris

Notre-Dame is an extreme case, but the underlying challenge is one architects and project managers face constantly: safety code compliance on buildings that weren’t designed for modern safety hardware.

Historic courthouses, university buildings, cultural centers, stadiums — any structure where the aesthetic and the authority requirement are in tension. Webnet’s approval as both a vertical and horizontal safety device, combined with its ability to be finished and configured to match existing conditions, makes it one of the few systems that can satisfy both sides of that tension simultaneously.

The Notre-Dame project is proof of concept at the highest possible level. If it clears the bar for a UNESCO World Heritage site undergoing the most scrutinized restoration in modern history, it clears the bar for your project.

Project Specifications

Working on a heritage project or a building where aesthetics and safety requirements are in conflict?

DOur team will assess whether a Jakob solution is technically appropriate for your application and provide honest guidance on what’s feasible.