The vault held the president’s body after the assassination until December 21, 1865. The vault also held the body of Lincoln’s son, Willie, who died at 11 while the president was still in office. The vault is in a low spot in the cemetery and over the years water had caused major deterioration.
Here is a pictorial view of reconstructing Oakridge Cemetery receiving vault. (Photos by Western Specialty Contractors)
The initial phase of the project involved channeling water away from the vault with the installation of drains. Once that task was completed, the general contractor began excavating the area around the vault in preparation for Western’s scope of work which included waterproofing, repairs to the stone facade, and restoration of the marble.
With the subsurfaces exposed, Western crews found extensive deterioration to the vault. The exterior walls had deteriorating bricks, voids in the masonry wall, and stone had been used as infill. They couldn’t simply apply waterproofing directly to the surface, and had to come up with a unique way to repair the walls and prep them for waterproofing.
Completed view. “We formulated a system using a low cement ratio mortar and brick infill in areas where the brick had deteriorated away from the wall. After infilling the voids in the walls, we applied a layer of the low cement ratio mortar to the entire wall surface to create a smooth surface with no protrusions that could penetrate through the bentonite sheet waterproofing.” – Springfield Project Manager Josh Woolard
The original stone material used on the serpentine retaining walls was no longer available, and Western crews had to find a suitable, alternate that would closely match the existing stones. Besides finding the correct length and depth of stones they had to compensate for voids resulting from the curves. “By first creating a template on Styrofoam of the gaps created by the removal of the stones, we were able to use computer software to find the radius of the curves within the wall.” – Josh Woolard
Completed view. Western also used other special methods to re-create the unique beaded joint in the original masonry. “…We used special tools and procedures which allowed the mortar to hold its shape while it was formed. This process provided a less workable material and was more time consuming for even small amounts of tuck pointing, but the end result is a structurally-sound, historical replication of how the vault was originally constructed,” said Woolard.