Effects of shading and composition in the Pacific Northwest, USA

Data Bank Details

Purpose of dataset

Effects of shading and composition in the Pacific Northwest, USA

Description of dataset

Three of the primary functions of green roofs in urban areas are to delay rainwater runoff, moderate building temperatures, and ameliorate the urban heat island (UHI) effect. A major impediment to the survival of plants on an unirrigated extensive green roof (EGR) is the harsh rooftop environment, including high temperatures and limited water during dry periods. Factors that influence EGR thermal and hydrologic performance include the albedo (reflectivity) of the roof and the composition of the green roof substrate (growing media). In this study we used white, reflective shading structures and three different media formulations to evaluate EGR thermal and hydrologic performance in the Pacific Northwest, USA. Shading significantly reduced daytime mean and maximum EGR media temperatures and significantly increased nighttime mean and minimum temperatures, which may provide energy benefits to buildings.

Name of researcher

Michael A. Bollman

Organisation/ University

U.S. Environmental Protection Agency, Center for Public Health and Environmental Assessment

Contact Number

000000

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