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

Volume 18 No. 2

Summer 2026

 

In this issue, our Case Study article describes our complex restoration and repair project at the Cambridge Courtyard condominiums located in the heart of Central Square in Cambridge, MA. Our Masonry 101 article defines concave mortar joints which we used on the condominium buildings to optimize aesthetics.

Sincerely,
Abbot Building Restoration Company, Inc.
Case Study

Abbot Completes First Phase of Complex Masonry Repair and Restoration Project at Cambridge Condominiums

Abbot recently completed the first phase of a complex restoration and repair project at the Cambridge Courtyard condominiums located in the heart of Central Square in Cambridge, MA. The property consists of two brick and stone mixed-use buidings with a recessed courtyard in the middle. Abbot procured the project via a competitive bidding process based on their relevant masonry experience and a fair cost estimate.


First Phase Focused on Front Elevation Repairs


The initial phase of the project focused on those areas on the front elevation of the building that were in need of significant repairs. First, Abbot cut and pointed 100% of the entire front elevation, including the interior courtyard, choosing a concave mortar joint to optimize aesthetics. Next, Abbot identified any deteriorated steel lintels and replaced them with new galvanized steel lintels, installed flashing around the lintels, and reinstalled the bricks that had been removed. Next, Abbot demolished and replaced selected deteriorated stone elements with new matching precast concrete stones.

 

Painting and Caulking Window Perimeters


Abbot then coated all of the stone with an elastomeric paint whose color was selected by the owners. In addition, Abbot scraped and painted all of the wood trim window surrounds, replaced any deteriorated or rotted wood trim, and caulked the perimeter of all of the windows.

 

Waterproofing Facade


Finally, Abbot waterproofed the entire brick façade using a clear sealer (BSM 400, Evonik Industries AG, Essen, Germany)), scraped and painted all of the fire escapes and metal railings above the entryways, painted all of the entryways, and top-coated the small roofs above the entryways with 988 silicone roof coating (Henry Company, Kimberton, PA).

 

Abbot is currently working on the second phase of the project, shifting its attention to the rear of the building.

Masonry 101

Concave Mortar Joints

Mortar joints are the visible lines of mortar between bricks or stones. The shape of the joint affects the wall's aesthetics and its ability to shed water. Of the various types of mortar joints, the most common and weather-resistant profile is the concave or bucket handle joint.

 

A concave joint profile is rounded and compressed inwards, dipping slightly below the brick faces. It is created using a hand jointing tool that features a rounded, curved metal blade used by masons to shape, compact, and seal mortar joints between bricks or concrete blocks. This results in a clean, inward-curving (concave) finish looking like the mortar has been lightly pressed by a finger.

 

28 Allerton Street
Boston, MA 02119-2933
Tel: (617) 445-0274 * Fax: (617) 445-0277
Email: steven@abbotbuilding.com
 
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