1850 Capitol Ave NE – Green Roof

About the project

Date: September 14, 2022
Client: 1850 Capitol Ave NE
Address: 1850 Capitol Ave NE

Project Information This 7,544 SF 6” Modular System offers an ideal balance between performance and moderate structural load (30-45 lbs/ft²). It retains 50-75% of annual rainfall, meeting critical stormwater regulations, reduces HVAC costs by 10-30%, and supports a variety of plant palettes (sedums, grasses, perennials).

6” Modular Green Roof System (7,544 SF) Data

6” Modular Green Roof System (7,544 SF):
Key Performance Data

This system is an ideal compromise, offering powerful performance metrics without the highest structural load.

Category	Metric / Estimated Data	Client Value Proposition & Application
System Classification	Type:	Deep Extensive / Semi-Intensive
System Classification	Excellent balance	Between high performance (water retention) and moderate structural demands.
Structural & Logistics	Saturated Weight:	30 – 45 lbs/ft².
Structural & Logistics	Total System Weight (Saturated):	226,320 – 339,480 lbs (113.16 – 169.74 tons).
Stormwater Compliance	Annual Water Retention:	50% to 75%+ of annual rainfall.
Stormwater Compliance	Max Single-Event Retention:	Retains up to 1 inch of rainfall depth in a single event. ()
Energy & Asset Life	Thermal Performance:	Reduces HVAC cooling costs by 10-30% and insulates against winter heat loss.
Energy & Asset Life	Membrane Protection:	Shields the roof membrane from UV damage and thermal expansion/contraction.
Horticulture & Installation	Plant Palette & Health:	Supports a wide variety of sedums, grasses, and drought-tolerant perennials.
Horticulture & Installation	Installation Method:	Modular trays (typically pre-grown).