je dunn construction master logo

Oklahoma State Capitol

Exterior Restoration

JE Dunn led the renovation, repair, and restoration of the exterior of the Oklahoma State Capitol, which was originally built in 1917. Working closely with the design team to evaluate and design, the scope of work included repointing of mortar joints, a painstaking and time-consuming process to protect the building from water infiltration; repair of cracked and damaged stone using the Dutchman Repair process; stone cleaning using a micro-abrasive process; scaffolding to allow the stone masons to gain access to all areas of the building’s exterior; restoring all 477 windows that surround the building and replacing all four wings of the existing copper roofing.

After a century of heavy use, harsh weather and inconsistent maintenance and preservation efforts, the building’s mechanical systems were failing, the exterior façade was crumbling and its prospects of meeting the state’s needs for another hundred years were fading. Recognizing the need to act, the Legislature enacted legislation providing funding for the Capitol’s first-ever comprehensive, top-to-bottom restoration.

There were over 21 miles of mortar joints on the Oklahoma Capitol. Due to the poor condition of the existing mortar, every single joint on the building had to be ground out and new mortar installed. It was a painstaking and time-consuming process in order to protect the building from water infiltration. JE Dunn tested various mortar types on the building to determine how well they weather Oklahoma’s climate and relate to the limestone, in order to deliver the best solution.

There were 240 locations on the Capitol where stone spalled and had to be repaired. Using the Dutchman Repair process, the damaged area was cut out and replaced with a new piece of stone. Stainless steel anchors were also installed. The repairs are barely visible to the naked eye and unnoticeable at higher elevations. The project was a 2020 AGC Build Oklahoma Award Recipient.

Oklahoma City, OK
Office of Management & Enterprise Services
TrenolHL / ADG Blatt Architects
Completion Date
March 2020
Windows Repaired
Repaired Mortar Joints
Square Feet
Stone Facade

Related Content

Cultural & Entertainment Federal Historical Preservation
Colorado Springs Denver
United States Air Force Academy
Cadet Chapel Historic Restoration
US Air Force Civil Engineering Center
Colorado Springs, Colorado
Cultural & Entertainment Government
City of Cedar Park Library
City of Cedar Park
Cedar Park, TX
City of Benbrook Municipal Complex
City of Benbrook
Benbrook, TX
Thought Leadership
Education Historical Preservation
Kansas City
Restoring Value and Culture on Campus: Historic Education Facility Renovations
Jeremy Baum
Vice President
Project Executive
April 2024
In The News
Historical Preservation
Kansas City
Technology Aiding in Historic Building Restoration
Jeff Callinan
Office Leader
June 2023
Texas Facilities Commission
Capitol Complex Master Plan
Texas Facilities Commission
Austin, Texas
TriMet Powell Garage
Portland, OR
Thought Leadership
Austin Dallas Houston Oklahoma City Tulsa
Beyond Participation Goals
Indria Hollingsworth
Senior Diversity, Equity & Inclusion Manager
South Central Region
October 2022
Government Justice
Greene County
Sheriff's Office and Jail
Greene County Missouri
Springfield, Missouri
Thought Leadership
Cultural & Entertainment Federal Historical Preservation
Colorado Springs
Virtual Modeling Changes the Communication Game at the US Air Force Academy Cadet Chapel
Donny Tennyson
Vice President
August 2021
No data was found
No data was found