Last updated: August 17, 2026
Article
Liberty Bell Center Glazing Project
The Liberty Bell Center is located between Chestnut and Walnut Streets and between 5th and 6th Streets.
Project Overview
The National Park Service (NPS) undertook the Liberty Bell Center Glazing Maintenance and Repair Project at Independence National Historical Park. This project installed bird-deterrent film on exterior glass surfaces of the Liberty Bell Center, including the Bell Chamber. Glass collisions are a leading cause of bird mortality nationwide, particularly in urban settings and along migratory routes such as Philadelphia.
The project advanced environmental stewardship goals while maintaining the building's iconic glass architecture. As part of its broader commitment to protecting wildlife and reducing environmental impacts at park facilities, the NPS implemented bird-friendly measures at the Liberty Bell Center to make the building safer for birds while preserving the visitor experience.
The work also addressed routine maintenance needs of the building's structural glass curtain walls. Together, these efforts will reduce bird strikes, improve the long-term performance of the exterior walls, and support sustainable management of this landmark.
Key components include:
- Bird-friendly glazing improvements: Installation of bird-deterrent film on exterior glass surfaces to make the glass visible to birds and reduce collisions.
- Curtain wall inspection and maintenance: Inspection of the structural glass curtain wall system to ensure continued safety and performance.
- Sealant replacement: Removal and replacement of deteriorated glazing sealants to restore weather resistance and protect the building from moisture intrusion.
- Glass cleaning and surface preparation: Cleaning of existing glazing surfaces in preparation for film installation and sealant replacement.