Sustainability

Green Roofing

Living roof systems that enhance performance, longevity, and sustainability.

The Value of Green Roofing

Sustainable building practices are crucial for minimizing environmental impact, enhancing energy efficiency, and fostering healthier urban environments. Green roofing contributes by reducing the urban heat island effect, managing stormwater runoff, and supporting biodiversity.

In late 2023, we completed a building envelope roof upgrade at the World Trade Center West along Seattle’s waterfront. By converting a single-ply membrane roof into a fully integrated green roof system, we improved energy efficiency, reduced runoff into Elliott Bay, and contributed to carbon sequestration. Designed with pollinators in mind, this green space reinforces our commitment to sustainable building practices while enhancing the visual appeal for those in higher offices.

Stormwater at source
Urban heat island
Membrane life
Pollinators
Elliott Bay

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Before and after

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The completed planted roof at World Trade Center West, seen from above

The roof during installation, growing medium going down in bands

During installation Completed

World Trade Center West, Seattle waterfront

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How the roof is built up

Structural deck

Step 1 of 6 · membrane only

Single-ply membrane

The roof as found: a single-ply membrane over the structural deck. It sheds every drop of rain straight into the city system, absorbs summer heat, and sits exposed to ultraviolet light for its whole life.

Hover a layer to name it. Heat and Water change what the overlay shows at this step.

Literacy

Understanding how green roof systems function is essential to designing durable and high-performing buildings. We explain each component of the system, including the growing media, drainage layers, root barriers, structural considerations, and stormwater behavior. This clarity helps clients see how vegetated roofs support thermal performance, protect the building envelope, and advance long-term sustainability goals.

Application

Applying green roof technology requires an integrated approach that considers structure, waterproofing, maintenance, and site-specific performance targets. We evaluate load capacity, membrane compatibility, stormwater requirements, and plant selection to ensure each system is seamlessly coordinated with the building’s envelope. The result is a resilient, low-impact roofscape that enhances both environmental performance and occupant experience.