Nantucket, MA
Andrews Building, North Wharf
Scope/Solutions
Originally a single-family house, the two-story, timber-framed building in Nantucket Harbor was in serious disrepair. The owner wanted to preserve and rehabilitate the building on North Wharf and as part of that effort, they needed to raise it above the floodplain as specified by local codes. SGH designed foundation repairs to address deteriorating piles that were insufficient in both stability and height.
Highlights of SGH’s work include the following:
- Established the required base elevation for the structure
- Determined design loads on the foundation
- Designed a foundation system to replace the deteriorated timber piles that incorporated steel helical piles and new pile caps
- Specified the use of a cathodic protection system to increase the life expectancy of the foundation
- Developed a construction sequence that included the following:
- Raising and sliding the building over the water
- Temporarily supporting the structure on cribbing until the helical piles were installed
- Resetting the structure at its new, higher elevation
- Provided construction monitoring services during installation of the helical piles
Project Summary
Solutions
Repair & Rehabilitation
Services
Structures
Markets
Residential
Client(s)
Andrews Family
Specialized Capabilities
Repair & Strengthening | Temporary Construction | Marine & Civil Works | Geotechnical
Key team members
![Rasko Ojdrovic](https://www.sgh.com/wp-content/uploads/2021/07/Rasko-P-Ojdrovic.jpg)
![Giuliana Zelada-Tumialan](https://www.sgh.com/wp-content/uploads/2021/07/Giuliana-Zelada-Tumialan.jpg)
Additional Projects
Northeast
Waverly Hall, 115 Mount Auburn Street
Constructed in the late 1800s, Waverly Hall is part of the Harvard Square Historic District. The owner wanted to create modern micro apartments while maintaining its historic character. SGH worked as the structural engineer of record and building enclosure consultant for the rehabilitation.
Northeast
Washington Mills Lofts
With exposed brick and timber framing, the apartments offer modern amenities with nods to the building’s history. SGH evaluated timber beams as part of the adaptive reuse project.