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419/423 Kennedy St., NW

Washington, DC
Front - A new five story building over a basement with 33 apartments and ground floor commercial space.
Building section from the east.
Perspective from the rear.
Excavation punched through into an unexpected water problem
Helical piles now support the building
The first floor concrete with structural steel to the second floor
This mobile tower crane can swing 4000 lbs 120 feet
The steel/wood platform will carry four stories of prefabricated wood construction
A typical floor panel; the crane is operated remotely like a drone
About one full floor and walls a week was installed
Stairwell door openings in the CLT
CLT panels in the queue.
CLT panels weigh about 4000 lbs.
The CLT panels sit atop the concrete shaft walls
CLT panels within the prefabricated floor plan
Starting to install the stair.
Stair installation is very clean
The interior shaft wall is finish grade
Second, third and fourth floors in place- the penthouse with three apartments still to go.

The project is a mixed use building with 33 apartments.  The front half of the ground floor is to be commercial/retail/assembly.

Originally planned to be built on typical spread footings, due to segnificant site water problems the building is now supported on about 150 helical piles.  The cellar and up to the first floor platform is PIP concrete.  Steel columns and a steel frame support the second floor platform and four stories above.  

The upper four floors are of prefabricated wood panel construction, by Blueprint-Robotics of Baltimore, MD.  However, due to difficulty in previous projects joining the work of masons, B-R elected to provide CLT for the elevator and stair enclosures.  

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Version History
  • Project uploaded by Stephen duPont on 01-08-2022
  • Project last updated by WoodWorks on 08-15-2024
Project Details
  • Year Built

    2022

  • Number Of Stories

    5

  • Bldg system

    Mass Timber

  • Square footage

    36,500

  • Construction Type:

    III-A

  • Building Type:

    Mixed-Use

  • Material Types:

    Cross-Laminated Timber (CLT)
    Hybrid (wood with steel or concrete)
    Light-Frame
    Open-web trusses

Project Team
  • Blueprint-Robotics Prefabricator
  • Blueprint-Robotics Fabricator / Installer
  • NT Construction Developer/Contractor
  • Stephen duPont Architect
  • Steven Goughnour SEOR
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Version History
  • Project uploaded by Stephen duPont on 01-08-2022
  • Project last updated by WoodWorks on 08-15-2024
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