Technical library
Redintegration of Sanctorum: Multidisciplinary Historic Rehabilitation Of Rockefeller Memorial Chapel
Article by Don Kilpatrick and Barry O’Quinn
Read the full article (PDF)Background on this topic from Inspec
Rockefeller Memorial Chapel stands as a historic icon on the University of Chicago campus. This article explores the complex, multi-phase restoration of its envelope, drainage, stained glass, carillon, and organ—balancing preservation, performance, and architectural heritage.
Common questions
Does Inspec perform the restoration work on historic buildings?
No. Inspec is a consulting engineering and architecture firm. We investigate existing conditions, test assemblies, analyze materials, prepare repair drawings and specifications, help owners bid the work, and observe construction for conformance with the documents. The physical repairs are carried out by contractors the owner retains, which keeps our findings and recommendations independent of who does the work.
Why does a historic chapel need several disciplines rather than one roofer?
Because the failures cross disciplines. Water entering at a tower louver, a coping joint or a stained glass perimeter can appear as damage on an interior wall far from the source. Masonry, roofing, glazing, drainage and interior protection all interact, so scoping them separately tends to produce repairs that solve a symptom while leaving the actual leak path untouched.
What investigation comes before repair drawings are prepared?
Typically close-up survey at each elevation rather than ground-level observation, selective probe openings to see concealed conditions, laboratory analysis of existing mortar and stone, and water testing that reproduces the reported leak. Those findings define the actual repair scope. Designing from a visual walk-through alone usually understates quantities and produces significant change orders during construction.
How is work phased around an active worship and event schedule?
Blackout dates for services, ceremonies and concerts are identified early and written into the contract documents. Work generally proceeds top-down so finished lower areas are not exposed to water from above, and repairs are grouped by access rather than by trade, since scaffolding often costs more than the repair it supports.
Can historic masonry be repointed with ordinary modern mortar?
Usually not. A mortar harder than the surrounding stone concentrates stress at the arris and can spall the stone face rather than sacrificing itself at the joint. Repointing on historic fabric is specified for compatibility with the original bedding mortar and stone, including strength, permeability, color and joint profile, and is normally confirmed with test panels.
Who verifies that the leaking has actually stopped after the repairs?
Verification belongs with the consultant, not the installer. Assemblies that were water tested during investigation can be tested again after repair, at the same locations, so the result is comparable. Observation during construction also matters, because most flashing and through-wall work is buried by later trades and cannot be inspected once the wall is closed.
How is scaffolding coordinated when several trades need the same elevation?
Access is planned as part of the design rather than left to each contractor. Masonry, sheet metal, roofing and glazing scopes on one elevation are grouped so a single scaffold or swing stage serves them in sequence. That sequence also sets which work must be finished before the next trade begins, so completed repairs are not disturbed.
What happens when hidden conditions turn up after the work is opened?
They will, on almost any older masonry building. Selective probes during investigation reduce the number, and unit prices carried in the bid documents give the owner a pre-agreed cost for common finds such as additional stone replacement or deteriorated backup. Field decisions are then documented and priced against those unit rates rather than negotiated under pressure.