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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 14 No.2
May/June 2022
In this issue, our Case Study article describes a major masonry restoration and brownstone replacement project on a 5-story brownstone and brick condominium building in Boston's Back Bay neighborhood. Our Masonry 101 article describes the benefits of EPDM membrane in low slope roofing applications.

We hope that the information in this publication will be of benefit to you. If you have any comments or questions, please contact us by phone at 617-445-0274 or by email at steven@abbotbuilding.com.
Sincerely,
Abbot Building Restoration Company, Inc.
Case Study
Abbot Completes Major Masonry Restoration and Replacement Project on Back Bay Condo Building
Abbot recently completed a major masonry restoration and replacement project on a 5-story brownstone and brick condominium building located at the corner of Clarendon and Beacon Streets in Boston’s Back Bay neighborhood.
 
Work was performed on the three exposed sides of the building. In preparation for the work, the exposed sides of the building were piped and enclosed with debris netting.
 
Matching Brownstone Size, Profiles, and Color

A significant portion of Abbot’s work consisted of replacement of deteriorated or fractured brownstone elements. Here, Abbot was able to creatively match the size, profiles, and color of selected large stone window surrounds and stone belts that wrap around the building.
 
In addition to the brownstone replacement, Abbot also cleaned and spot pointed the building, and replaced spalled bricks as necessary.
 
Challenging Roofing Work

Sub-contractor work consisted of roofing, carpentry and painting, with roofing presenting the biggest challenge. The fifth floor unit roof deck was disassembled and removed to allow installation of a new EPDM synthetic rubber roof. The mansard was replaced in kind with a new black fish scale style slate. In addition, selected gutters were replaced and new ties were affixed to the old downspouts. 

Further, all wood elements, including window trim/moldings and bays, were scraped restored and repainted.
 
Efficient Project Management

Due to the extensive scope of work and the multiple subcontractors/trades involved, a challenging aspect of the project was the overall coordination and timing. Despite these formidable obstacles, the job was managed and completed on time in an extremely efficient manner.
Masonry 101
EPDM Membrane
EPDM (ethylene propylene diene terpolymer) is an extremely durable synthetic rubber roofing membrane widely used in low-slope buildings in the United States and worldwide. Its two primary ingredients, ethylene and propylene, are derived from oil and natural gas. EPDM is available in both black and white, and is provided in a broad variety of widths, ranging from 7.5 to 50 feet, and in two thicknesses, 45 and 60 mils.
 
EPDM can be installed fully adhered, mechanically attached, or ballasted, with the seams sealed using liquid adhesives or specially formulated tape.
 
Advantages of EPDM

EPDM roofing membrane material plus installation is more expensive than conventional asphalt shingles. However, despite its higher cost, EPDM membrane offers greater durability, reduced maintenance requirements, and long term cost effectiveness. In fact, EPDM roof membranes remain stable over time and can have a life expectancy of over 50 years. In addition, due to its flexibility, EPDM membrane can be installed in certain areas where asphalt shingles cannot.

EPDM Limitations

Although the advantages of EPDM outweigh its drawbacks, the material does have some limitations.

Common EPDM roofing problems include:

  • Punctures or damage to the membrane
  • Shrinkage
  • Incorrectly installed or improper flashing
  • Wrinkles extending into roof seams.

However, many of these problems are due to incorrect or improper installation. This is why a trained roofer is essential to any roof installation. In most cases, repair is straightforward should a damage occur.

Note: In our experience, EPDM is more commonly used for flat institutional/industrial roofs and asphalt for residential sloped roofs.
28 Allerton Street
Boston, MA 02119-2933
Tel: (617) 445-0274 * Fax: (617) 445-0277
Email: steven@abbotbuilding.com