Diamond Bar
Masonry Solutions

News and Insights on the Masonry Repair and Maintenance of Institutional, Commercial, and Condominium Buildings in  
Eastern Massachusetts  

Volume 11 No. 3
July/August 2019
In this issue, we deviate from our normal format and bring you a comprehensive Case Study article on one of its largest restoration and repair projects in our rich 80+ year history. The project took place in three phases over nearly 3 years. It involved liaison with an architectural/engineering consulting firm, cooperation with the City of Boston's Historic Landmarks Commission, and multiple complexities as described below.
We trust that you will benefit from the information provided in this publication. If you have any comments or questions, or would like an estimate on a masonry repair project, we can be reached by telephone at 617-445-0274 or at our web site at www.abbotbuilding.com.

Michael Norman, President
Abbot Building Restoration Company, Inc.

Case Study

Abbot Completes One of Its Largest Restoration and Repair Projects in its 80+ Year History

Abbot recently completed a multi-phase restoration and repair project involving two high-rise connected commercial ornamental historic buildings located at 10 Milk Street and 294 Washington Street in downtown Boston. Collaborating with the engineering firm of CBI Consulting, Inc. (Boston, MA), the design/build team was able to conduct all of required repairs and renovations while working closely with the City of Boston's Landmarks Commission to preserve the historic integrity of the buildings.
Phase 1: June 2016 - December 2016
294 Washington Street, Boston, MA 
The first phase of the project took place at the back left corner of the Spring Lane side of 294 Washington Street. This phase consisted of demolition of the brick corner from the roof to the ground to expose the steel column. Following demolition, Abbot repaired the deteriorated steel in the column and rebricked the corner to match the existing brick. Abbot also conducted other repairs on the back wall and the interior light well.
Phase 2: March 2017 -- March 2018
10 Milk Street, Boston, MA
Phase 2 of the project focused on the Milk Street building face and courtyard. This phase began with of removal of the ornamental 4-foot terra cotta shelf on the 9th floor, and replacing it with GFRP (fiberglass) replicated to match the original appearance.
Importantly, it was determined through inspection that the terra cotta had deteriorated and was debonding from the building. Based on the engineer's recommendation, it was decided to remove the entire terra cotta shelf to expose the structural steel, and then repair the structural steel, adding new steel framing and a pressure treated wood top. The finished appearance of the shelf was then replicated with GFRP (fiberglass) panels to match the original shelf.
A significant complication of this phase was providing a mock-up of the shelf to the Landmarks Commission for approval of the appearance and color of the finished shelf. The GFRP was mechanically anchored to the new plywood framing and the seams were sealed. Because the fiberglass surface was very smooth, it was necessary to anchor a series of snowguards on the surface to provide pedestrian safety from falling snow.
On the Milk Street side of the building, Abbot also replaced the right brick corner from the 3rd to 10th floors, repaired the deteriorated steel, and replaced the brick to match the original color. Located next to this location is modern office building whose loading platform abutted the work area. To allow access to the loading platform while the work was ongoing, Abbot cantilevered over the platform to allow erection of the scaffolding. The corner and shelf was then removed and replaced as described above.
Phase 3: March 2018 - January 2019
Phase 3 involved the Washington Street building. This phase was extremely complicated due to heavy pedestrian traffic underneath. Here, Abbot built a structural walkway over the front of the building to cover the width of the sidewalk. The scaffolding was then erected on the face of the building above the structural walkway to the height of the terra cotta shelf. A further complexity concerned erection of the portion of the scaffolding on the right side of the front elevation of the building where the glass canopy that provided natural light over where the entrance to the State Street MBTA station was located. It was necessary to remove the masonry above the canopy and install structural steel to cantilever over the glass. The steel provided a platform to protect the glass, and allowed erection of the scaffolding above the canopy to access the right side of the building. The 9th floor shelf was then removed and replaced as in Phase 2.
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Abbot Building Restoration Co., Inc. 
28 Allerton Street, Boston, MA 02119 
Tel: 617-445-0274  ยท Fax: 617-445-0277