Project Overview

Philip Merrill Environmental Center

The World’s First LEED® Platinum Building

The Chesapeake Bay Foundation's Philip Merrill Environmental Center Case Study

Completed in December 2000 and opened in 2001, the Philip Merrill Environmental Center in Annapolis, Maryland serves as the headquarters of the Chesapeake Bay Foundation (CBF). The 32,000-square-foot, two-story facility was designed as a working model of environmental stewardship—demonstrating that high-performance buildings can operate in harmony with sensitive ecosystems while maintaining comfort, functionality, and long-term durability.

The Merrill Center made global history as the first building in the world to earn LEED® Platinum certification under the U.S. Green Building Council’s LEED v1 rating system.

Design and Sustainability

The Merrill Center was designed using an integrated approach that prioritized passive systems before mechanical solutions. The building incorporates a sophisticated mixed-mode ventilation system that allows natural ventilation when outdoor conditions are optimal. Sensors determine when windows should be opened, and the building management system automatically switches between natural and mechanical modes.

Additional sustainability strategies include:

• Geothermal heat pumps with desiccant dehumidification

• 111 kW photovoltaic array

• Solar thermal hot water systems

• Rainwater harvesting and reuse

• Composting toilets

• Native landscaping and habitat restoration

• Smart stormwater management

• Daylighting strategies with clerestories and open interior planning

The building uses approximately 50% less energy than a conventional office building of comparable size and achieves over 90% reduction in water use compared to a typical facility. It remains an ENERGY STAR® “Top Performance” building with a rating of 98.

Why SIPS?

Structural Insulated Panels (SIPS), manufactured by Premier SIPS, were used in both the wall and roof assemblies.

At the time of design in the late 1990s, selecting SIPS was a forward-thinking decision. The project team required a building envelope capable of delivering:

• High R-values

• Reduced thermal bridging

• Superior airtightness

• Structural efficiency

• Rapid enclosure

SIPS provided an integrated structural and insulation solution that aligned perfectly with the project’s aggressive energy and environmental performance goals.

For a building intended to set a new global benchmark in sustainability, envelope performance was foundational—and Premier SIPS played a critical role in achieving it.

Benefits of SIPS

Continuous High-Performance Insulation

SIPS provided superior insulation in both roof and wall systems, significantly reducing heating and cooling loads.

Airtight Envelope

A tight building envelope was essential to supporting the mixed-mode ventilation strategy and maximizing passive design benefits.

Structural Efficiency

Panelized construction improved build quality and simplified coordination between structural and energy systems.

Long-Term Energy Savings

The Merrill Center operates at roughly 50% lower energy use than comparable office buildings, resulting in substantial annual savings.

Performance Highlights

• First building in the world to achieve LEED® Platinum certification (LEED v1)

• ENERGY STAR® “Top Performance” rating of 98

• 50% less energy use than comparable office buildings

• 111 kW solar array generating approximately 135 MWh annually

• Solar thermal hot water system

• 80–90% reduction in water use

• Mixed-mode ventilation active approximately 25% of the year
  
  

Construction and Innovation

The Merrill Center was completed at a time when sustainable design was still considered experimental. The project team adopted a cradle-to-cradle philosophy for materials, prioritized recycled and rapidly renewable products, and minimized site disturbance.

The use of SIPS in both roof and walls was instrumental in delivering the high-performance envelope required to meet LEED Platinum standards. More than two decades later, the building continues to operate as a living laboratory for environmental design and remains one of the most influential sustainable buildings in North America.