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TW Construction, LLC

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Gaithersburg, MD 20878

Company Info

  • Est. 1987
  • Size 50-99 Employees
  • Annual Vol $10 million - $20 million

Featured Project Return to Projects List

Nist Net Zero House

Project Information

Project Location:
Gaithersburg, MD
Status:
Completed
Structure Type:
Residential Building

References

Architect:
Building Science Corporation

Scope Of Work

Our Project

  • Look again! What appears to be a typical suburban Maryland home is a highly-engineered, $2.6 million NIST laboratory that was awarded the US Green Building Council’s LEED Platinum certification.
  • The project is a prototype for the ultimate energy-efficient dwelling and is part of NIST’s long-term study that will revolutionize the way sustainably-built homes of the future are designed and constructed.
  • The Net Zero Energy Residential Test Facility Overview (PDF)

Why Therrien Waddell?

  • Therrien Waddell was an early advocate of energy-efficient construction methods. Senior leaders earned LEED accreditations and TW eventually achieved enough expertise to conduct sustainability information sessions.
  • NIST officials who attended one of TW’s sustainability sessions saw TW as a potential resource for this budding landmark energy efficiency project. Jerry Therrien says, “Our team was chosen for this project in a best value selection process, in large part because our experience has propelled us as subject experts in a multitude of sustainable practices.”

Challenges and Results

  • Highly specialized design and performance criteria, concerning every aspect of construction, demanded changes in accustomed means and methods. Adherence to these requirements, for example, led to a building envelope that exceeded all industry standards for air tightness in the first stage of construction.
  • The client’s requirement for all American-made materials (ARRA) was a major challenge, but the TW team was able to meet the budget and schedule despite this unusual specification.  
  • TW identified design conflicts by doing a Building Information Model (BIM) that was not required by the contract, but essential for early resolution of potential coordination issues.
  • Quality control, commissioning, oversight, and team coordination were critical because TW couldn’t alter design elements. Despite challenges, the project was completed on time to the client’s satisfaction and standards—remarkable for a project of this complexity.

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