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> Investigative Services
> Access Consulting
> Project Deliverables
> Client List
> Wind Energy Services
Technology Highlights
> Fiber-Optic Investigation
> Bridge and Truss Investigations
> Nondestructive Testing
> Guastavino Tile Ceilings, Domes and Vaults
> Tablet PC Annotation System (TPAS)
> Debris Net
> Shrinking Net
Project Profiles and Sample Drawings
> Religious Buildings
> Government and Institutional Buildings
> Academic Buildings
> Commercial and Residential Buildings
> Civil Structures
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> Guastavino Projects
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Cathedral Basilica of Saints Peter and Paul
Philadelphia, PA
Original architect
John Notman and Napoleon LeBrun (completed 1864)
Building owner
Archdiocese of Philadelphia
In collaboration with
Building description
The Cathedral Basilica of Saints Peter and Paul in Philadelphia was designed by John Notman and Napoleon LeBrun and constructed between 1846 and 1864. The exterior walls are load-bearing masonry, with brownstone cladding. The copper-clad dome rises from the crossing of the Cathedral, with the top of the dome approximately 200 feet above the ground. A sheet copper spire surmounted by a gilded orb and cross sits atop the dome. The existing copper cladding was purportedly installed in the 1950s to replace an earlier copper cladding of the dome, which in turn replaced the original tin cladding at the dome of the Cathedral.
The copper dome is comprised of 12 facets, which are divided by large vertical ribs. In between the vertical ribs are sheet copper pans of the dome cladding, which have folded horizontal seams. The pans extend vertically up the dome 27-1/2 inches high from seam to seam, as determined at several locations along the height of the dome. The vertical seams between the pans are covered by trapezoidal vertical ribs. Near the bottom of each facet is an arched top window with copper clad frame and sash.
Scope of work
Philadelphia, PA
Original architect
John Notman and Napoleon LeBrun (completed 1864)
Building owner
Archdiocese of Philadelphia
In collaboration with
Building description
The Cathedral Basilica of Saints Peter and Paul in Philadelphia was designed by John Notman and Napoleon LeBrun and constructed between 1846 and 1864. The exterior walls are load-bearing masonry, with brownstone cladding. The copper-clad dome rises from the crossing of the Cathedral, with the top of the dome approximately 200 feet above the ground. A sheet copper spire surmounted by a gilded orb and cross sits atop the dome. The existing copper cladding was purportedly installed in the 1950s to replace an earlier copper cladding of the dome, which in turn replaced the original tin cladding at the dome of the Cathedral.
The copper dome is comprised of 12 facets, which are divided by large vertical ribs. In between the vertical ribs are sheet copper pans of the dome cladding, which have folded horizontal seams. The pans extend vertically up the dome 27-1/2 inches high from seam to seam, as determined at several locations along the height of the dome. The vertical seams between the pans are covered by trapezoidal vertical ribs. Near the bottom of each facet is an arched top window with copper clad frame and sash.
Scope of work
- Investigated and documented the existing conditions of the exterior copper cladding on the dome, spire and drum.
- Measured the thickness of the copper cladding on the dome using a StressTel TM1-CD Ultrasonic Thickness Gauge.
- Provided high definition live-feed video to project team during inspection of representative areas.
