LIGHTWEIGHT GREEN ROOF SYSTEMS
Impact/Purpose:
Develop and test a light-weight modular green roof system for retrofitting existing buildings, eliminating the need for structural reinforcement to accommodate the system. The resultant prototypes will retain storm water, decrease heat gain, insulate the underlying roof, mitigate carbon from the atmosphere, and save heating and cooling energy.
Description:
Applying a Lightweight Green Roof System to a building can achieve in managing storm water runoff, decreasing heat gain, yielding energy savings, and mitigating the heat island effect. Currently, Most green roof systems are considerably heavy and require structural reinforcement of an existing structure. The soil in the vegetative roof system saturated with rainwater accounts for the majority of the weight. Replacing soil with a natural and/ or synthetic light-weight planting medium enriched with nutrients has the potential to eliminate the need to reinforce existing buildings and still provide the benefits of vegetated roof. This project will demonstrate that the introduction of a combination of light weight materials can grow and sustain roof vegetation while reducing the heat island effect and harmful water runoff. The team will use analytical methods to evaluate growth medium chemistry, a rain simulation apparatus to evaluate prototype water retention, accelerated weathering and tensile tests to qualify materials, and artificial metal halide lighting to grow prototypes of green roof systems. The team will integrate green roof concepts into an outreach program run by the Drexel Smart House organization which gives public educational workshops on improving residential building envelopes in the West Philadelphia community. Researchers will also advise the Philadelphia Water Department on residential runoff reduction strategies.
Record Details:
Record Type:PROJECT(
ABSTRACT
)
Start Date:08/15/2010
Completion Date:08/14/2011
Record ID:
248946
Keywords:
BUILDING ENVELOPE, INSULATION, WATER RETENTION, CARBON REDUCTION,
CARBON SEQUESTRATION, HEAT ISLAND EFFECT, SUSTAINABLE WATER MANAGEMENT, STORM WATER MANAGEMENT, GREEN ROOF, ENERGY CONSERVATION,
Related Organizations:
Role
:OWNER
Organization Name
:DREXEL UNIVERSITY
Mailing Address
:3141 Chestnut St
Citation
:Philadelphia
State
:PA
Zip Code
:19104
Project Information:
Approach
:A light-weight green roof will consist of the synthetic base planting medium with characteristic high water absorption and low unit weight. It will be pre-assembled units of encapsulated growth medium and vegetation. The system will be tested for moisture and nutrient retention, its ability to discharge excess water after it had reached its full saturation point, vegetation growth rates, durability, weathering and overall performance.
Cost
:$9,952.00
Research Component
:Pollution Prevention/Sustainable Development
Approach
:A light-weight green roof will consist of the synthetic base planting medium with characteristic high water absorption and low unit weight. It will be pre-assembled units of encapsulated growth medium and vegetation. The system will be tested for moisture and nutrient retention, its ability to discharge excess water after it had reached its full saturation point, vegetation growth rates, durability, weathering and overall performance.
Cost
:$9,952.00
Research Component
:P3 Challenge Area - Water
Approach
:A light-weight green roof will consist of the synthetic base planting medium with characteristic high water absorption and low unit weight. It will be pre-assembled units of encapsulated growth medium and vegetation. The system will be tested for moisture and nutrient retention, its ability to discharge excess water after it had reached its full saturation point, vegetation growth rates, durability, weathering and overall performance.
Cost
:$9,952.00
Research Component
:P3 Challenge Area - Built Environment
Project IDs:
ID Code
:SU834730
Project type
:EPA Grant