Jon Burke 2006 Mechanical Faculty Consultant: Dr. Jelena Srebric An In-depth Look at a Green Roof

Outline Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric Building Information Purpose Procedure Results First Cost Analysis Lifetime Analysis Additional Benefits Conclusions

Existing Conditions Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric Central Shared Use Facility FDA’s White Oaks Campus Silver Spring Maryland Rendering supplied by Kling Design Firm: Kling Civil Firm: Greenhorne & O’mara Owner: GSA

Existing Conditions Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric 3 rd Floor – Library 26,500 sq ft. VAV System Cold and Hot water pumped from Central Plant on Campus Rendering supplied by Kling

Existing Conditions Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric

Purpose Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric First Cost Analysis Material and Labor Rainwater Quality Structural Support Lifetime Analysis Energy Savings Maintenance Costs GOAL: Find “Benefit”/sf and optimal size How does size affect project costs and benefits? Other Benefits LEED Rating Architectural Value

Procedure Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric

Procedure Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric

Procedure Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric

Procedure Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric

Procedure Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric

Procedure Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric

Procedure Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric

Procedure Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric

Results – First Costs Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric Materials and Labor Built-up Flat Roof: $2/sf Green Roof: $14/sf COST $12/sf Green Roof

Results – First Costs Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric Rainwater Runoff Quality Runoff of Green Roof is Clean Bio-Retention System 1 I.A. = 3000 sf Filter Greenhorne & O’mara $10 /sf of Filter SAVE 69 ¢ /sf of Green Roof

Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric Results – First Costs Structural Support for 50 psf 30” Diameter ($1,992)  14” Diameter ($875) 24” x 24” ($3,203)  12” x 12” ($1,252) COST $2.50/sf Green Roof

Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric Results – First Costs Total First Costs Materials and Labor: $12/sf Structural Impact: $2.50/sf Filter System: -$0.69/sf Total: $13.80 Additional Cost per Square Foot of Green Roof

Results – Annual Costs Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric Energy Savings SAVE 21 ¢ /sf Green Roof PER YEAR Annual Electric Load Reduction 2.15 kWh/sf Green Roof Peak Cooling Load Reduction 0.6 tons/265 sf Green Roof GSA: 10 ¢ /kWh

Results – Annual Costs Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric Maintenance Costs Built-up Flat RoofGreen Roof Annual Maintenance Lifetime: 15 yrs Negligible Maintenance Lifetime: ?? Greening Rooftops for Sustainable Communities. Chicago Page 280

Results – Other Benefits Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric LEED Rating Guaranteed Credit 6.1: Stormwater Management – 1 point Credit 7.2: Heat Island Effect – 1 point Architectural Value

Conclusion Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric “Energy conservation is the foundation of energy independence. ” ~Thomas H. Allen (D-ME 1 st )

Conclusion Jon Burke 2006 Mechanical Option Consultant: Dr. Jelena Srebric Any Questions?