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
1 of 5
Project Summary
2007
Completion Date
Solutions
Repair & Rehabilitation
Services
Structures
Markets
Residential
Client(s)
Andrews Family
Specialized Capabilities
Repair & Strengthening | Temporary Construction | Marine & Civil Works | Geotechnical
Key team members
Additional Projects
Northeast
29 and 31 Newbury Street
The brownstone row houses at 29-31 Newbury Street were built between 1872 and 1874 and are contributing structures in the Back Bay Historic District. SGH helped developed a comprehensive facade restoration program that restored the original appearance of the building and improved durability.
Northeast
Mercantile Wharf
Adapted in the 1970s, the Mercantile Wharf Building now includes four levels of apartments over ground-floor retail space. SGH completed a condition assessment of the timber-framed and masonry bearing wall structure.