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Work begins below Salt Lake Temple for 3 new underground floors, massive seismic-strengthening pipes

Scaffolding and cranes maneuver on the north side of the Salt Lake Temple during its lengthy renovation project, Salt Lake City, Utah, Sept. 2021.
Scaffolding and cranes maneuver on the north side of the Salt Lake Temple during its lengthy renovation project, Salt Lake City, Utah, Sept. 2021.
The Church of Jesus Christ of Latter-day Saints

During September, construction workers with the Temple Square renovation have started a major seismic strengthening process, continued excavation for three new underground floors and installed two trusses on the Salt Lake Temple roof.

The September update comes more than two years after President Russell M. Nelson announced major renovation plans for the Salt Lake Temple of The Church of Jesus Christ of Latter-day Saints, headquartered in Salt Lake City, Utah.

Eleven photos and information about each part of the process were provided Thursday by the church’s newsroom.

Major seismic strengthening

“Over the past month, the Salt Lake Temple has begun ‘jack and bore,’ a major seismic strengthening process in which steel pipes, 3.5 to 4 feet in diameter, are inserted below its existing foundations. The soil is removed from inside the pipe as it is gradually inserted horizontally. Each pipe under the temple towers is 40 feet long, made from two 20-foot-long segments welded together. The soil inside the pipes will initially be removed by hand to ensure the pipes are precisely installed. The gap between the outside surface of the pipe and the surrounding soil is then filled with grout. After the pipes are installed they will be filled with reinforced steel, including post-tensioning strands, and high-strength concrete. The entire existing foundation of the temple will be supported by 92 such pipes. The first pipe was inserted in late August under the east towers.”

Crews insert a steel pipe below the existing foundation of the Salt Lake Temple.
Crews insert a steel pipe below the existing foundation of the Salt Lake Temple as part of a seismic strengthening process called jack and bore, Salt Lake City, Utah, Sept. 2021.
The Church of Jesus Christ of Latter-day Saints
Pipes 40-feet-long are used to strengthen the temple’s foundation against earthquakes, Salt Lake City, Utah, Sept. 2021.
Pipes 40-feet-long are used to strengthen the temple’s foundation against earthquakes, Salt Lake City, Utah, Sept. 2021.
The Church of Jesus Christ of Latter-day Saints
Pipes installed during the jack and bore process are filled with reinforced steel, including post-tensioning strands and high-strength concrete.
Pipes installed during the jack and bore process are filled with reinforced steel, including post-tensioning strands and high-strength concrete, Salt Lake City, Utah, Sept. 2021.
The Church of Jesus Christ of Latter-day Saints
Construction workers fill the new pipes in the foundation with reinforced steel, Salt Lake City, Utah, Sept. 2021.
Construction workers fill the new pipes in the foundation with reinforced steel, Salt Lake City, Utah, Sept. 2021.
The Church of Jesus Christ of Latter-day Saints

Excavation continues

“On the north side of the temple, the excavation has continued past the level of the entrance tunnel. This excavation will provide space for three new underground floors, which will be used as an addition to the temple. The tunnel will connect the Salt Lake Temple to the underground parking garage in the Conference Center to provide safer and easier access to those visiting the sacred edifice.”

Crews excavate past the level of the entrance tunnel on the north side of the temple, Salt Lake City, Utah, Sept. 2021.
Crews excavate past the level of the entrance tunnel on the north side of the temple, Salt Lake City, Utah, Sept. 2021.
The Church of Jesus Christ of Latter-day Saints
Additional excavation creates room for three new levels of the temple, Salt Lake City, Utah, Sept. 2021.
Additional excavation creates room for three new levels of the temple, Salt Lake City, Utah, Sept. 2021.
The Church of Jesus Christ of Latter-day Saints

Trusses on the temple roof

“Two new trusses were installed on the roof of the temple. Three of the eight areas (or bays) have already been completed as part of the truss installation. The roof is closed each time new trusses are installed to protect the interior finishes of the historic building.”

Crew installed two new trusses on the roof in September 2021 as part of the Temple Square renovation in Salt Lake City, Utah.
Crew installed two new trusses on the roof in September 2021 as part of the Temple Square renovation in Salt Lake City, Utah.
The Church of Jesus Christ of Latter-day Saints

Secant wall

“The secant wall that acts as a retaining wall around the temple continues to be excavated to prepare for the three future floors underground and to contain the soil under the temple.”

The secant wall surrounding the temple is uncovered to prepare for the three future floors underground, Salt Lake City, Utah, Sept. 2021.
The secant wall surrounding the temple is uncovered to prepare for the three future floors underground, Salt Lake City, Utah, Sept. 2021.
The Church of Jesus Christ of Latter-day Saints
Crew members dig to prepare the secant wall for new underground levels that will be added to the temple, Salt Lake City, Utah, Sept. 2021.
Crew members dig to prepare the secant wall for new underground levels that will be added to the temple, Salt Lake City, Utah, Sept. 2021.
The Church of Jesus Christ of Latter-day Saints
Aerial view of Temple Square during its renovation, Salt Lake City, Utah, Sept. 2021.
Aerial view of Temple Square during its renovation, Salt Lake City, Utah, Sept. 2021.
The Church of Jesus Christ of Latter-day Saints

To learn more about the Salt Lake Temple renovation, visit templesquare.org or ChurchofJesusChrist.org.