Green Roof Retrofitting: Potential Assessment in an Academic Campus
Retrofitting becomes the priority action for existing buildings under uncertain economic times and increasing environmental awareness. Before retrofitting, it is necessary to evaluate the potential and feasibility of the buildings to minimize the risks. The challenge is the evaluation with relevant criteria and assessment framework from sustainable perspective. Using Asian Institute of Technology (AIT) campus as study area, this paper aims to assess the potential of existing buildings for green
... buildings for green roof retrofitting. Multicriteria analysis was applied in the potential assessment, where inputs were generated from questionnaires survey, visual inspection and literature records. The potential benefits were identified and estimated through systematic literature reviews and savings calculation. The results revealed that physical factors have the highest influence on the assessment where 47% of buildings in study area were found to be viable for retrofitting while 6% were not viable, and 47% as possibly viable. Free standing, concreteframed with flat roof and oriented to south buildings appeared to be more preferable for retrofitting. Approximately 2% of annual energy use could be saved from campus-wide retrofitting however mitigation of impacts related to urban heat island and air quality need a micro scale implementation to provide more effective results. The study contributes to the building industry by providing a way to conduct the potential assessment for green roof retrofits in terms of criteria and assessment framework not only at micro scale but also at a wider scale in the regional context.