Bradley Williams - CM Introduction Prevention through Design Façade Re-design for PtD Taylor Hall Stick-Built vs. Infinity System Green Roof Addition George Mason University Conclusion Acknowledgments Fairfax, VA Advisor: Ed Gannon Renderings courtesy of Gensler
Taylor Hall – George Mason University Fairfax, VA Bradley Williams - CM Project Delivery – Design Build Introduction Project Statistics : Prevention Through Design Façade Re-design for PtD Owner • 295 Freshman Students Stick-Built vs. Infinity System Green Roof Addition • 70,057 GSF Conclusion Acknowledgments Design Builder • ~$16,000,00 • 12 months of construction Architect • LEED Silver Design Various Sub-contractors Sub-contractors Renderings courtesy of Gensler
Taylor Hall – George Mason University Fairfax, VA Bradley Williams - CM Introduction Investigation Goals Preview of Analyses Prevention Through Design Façade Re-design for PtD Stick-Built vs. Infinity System Analysis 1: Prevention through Design ! Investigate new ways to increase job-site safety Green Roof Addition Conclusion Analysis 2: Façade Re-design for Fall Safety Acknowledgments Reduce injury risk for construction workers, future Architectural Breadth: Mechanical Access Points students and maintenance personnel $ Analysis 3: Stick-Built construction vs. Infinity System Reduce the cost of construction while maintaining quality Analysis 4: Green Roof Addition Increase the awareness for sustainable design Structural Breadth: Green Roof Load incurrence
Taylor Hall – George Mason University Fairfax, VA Bradley Williams - CM A N A L Y S I S O N E Introduction Prevention through Design Prevention Through Design Ideas for Implementation Critical Industry Research Façade Re-design for PtD Current Industry-Wide Issues Stick-Built vs. Infinity System Green Roof Addition • Raising sill height to 39” • Lack of risk knowledge Conclusion • Lack of early collaboration/communication Construction Maintenance Decommissioning Acknowledgments Disposal / Recycling • Prefabrication • Lack of contractual obligation for safety • Raising parapet height and using flat roofs • Lowering mechanical access points “…the Center for Disease Control and Prevention (CDC) have pinpointed in recent studies that an abundant 37% of these work • Using low VOC materials related injuries are directly caused by poor design ” - CDC.gov Balfour Beatty Construction
Taylor Hall – George Mason University Fairfax, VA Bradley Williams - CM A N A L Y S I S T W O Introduction Façade Re-design and Implementation of Prevention Through Design Prevention through Design Façade Re-design for PtD Results : Architectural Breadth Stick-Built vs. Infinity System Green Roof Addition • Increase job site safety Conclusion • Logical Safety improvement method given prefab structural system Acknowledgments • Prevent student misconduct $17,156.40 • Total cost of implementation: • Benefits outweigh cost • No schedule impact • Save cost on temporary fall 39 in. protection lines Renderings courtesy of Gensler
Taylor Hall – George Mason University Fairfax, VA Bradley Williams - CM A R C H I T E C T U R A L B R E A D T H Introduction Investigation of Mechanical Access Points Prevention Through Design Façade Re-design for PtD Mechanical Access Heights Architectural Breadth Stick-Built vs. Infinity System Mechanical Room Floor Mounted 8’ 6” Green Roof Addition Equipment Conclusion Unit FCU Access 3’ 5” 3’ 5” Acknowledgments Mechanical 7’ 8” Penthouse • All access points considered safe (except trip hazard in pent house) • All access points behind locked doors or restricted access FCU Access points in each unit • Considered very “safe” design Renderings courtesy of Gensler
Taylor Hall – George Mason University Fairfax, VA Bradley Williams - CM A N A L Y S I S T H R E E Benefits • No schedule change with prefabrication Introduction Stick-Built Framing vs. Infinity Structural System • Fire safe construction Prevention Through Design • Experienced craftsmen in D.C. area Façade Re-design for PtD Stick-Built vs. Infinity System Overall Cost of Stick-Built System Green Roof Addition Part of System Price Conclusion Wooden Roof Trusses/Sheathing $128,240.64 Acknowledgments Wooden Framing $612,998.75 Wooden Joists/Girders $1,224,596.36 TOTAL COST $1,965,835.75 Total ($/SF) $28.06 Location Adjustment Multiplier (78.3) $21.97 Renderings courtesy of Gensler • Infinity Structural System estimated at $23 / SF • Total Savings of $72,158.71 Photos courtesy of Brad Williams
Taylor Hall – George Mason University Fairfax, VA Bradley Williams - CM A N A L Y S I S F O U R Green Roof Addition Introduction Fiscal Analysis Multi-purpose Room Green Roof Prevention Through Design • Installation Cost of $17,696.63 Façade Re-design for PtD Stick-Built vs. Infinity System • 1 day installation • Payback Period: 4.17 - 6.7 years Green Roof Addition Structural Analysis 50 – year Life Cycle Cost Benefit Analysis ($/SF) • Internal Rate of Return*: 4.21% Green Roof Conclusion Initial Cost $13.51 Acknowledgments • Return on Investment*: 196% Maintenance and Replacement $18.25 Storm Water Reduction Savings $11.37 * Not including CO2 Emissions, Community Benefits, or Re-Sale Value Energy Savings $6.37 • 1,310 SF total Omni-Ecosystems.com Takeaways CO2 Emission Savings $2.60 • Omni-Ecosystem comprehensive style • Significantly longer life than T.P.O. green roof for optimum weight Community Benefits $30.90 • Can be added post-construction • Educational opportunities in sustainability Property Re-sale value premium $105.93 • Low maintenance, high efficiency • Lifetime net yield of up to $182,000 of benefits
Taylor Hall – George Mason University Fairfax, VA Bradley Williams - CM S T R U C T U R A L B R E A D T H Introduction Structural Evaluation of Potential Green Roof Prevention Through Design Structural Change Façade Re-design for PtD Load Comparison Stick-Built vs. Infinity System Member Existing Load New Load Allowable Green Roof Addition Load Path of Green Roof Existing Factored Load: 81 PSF Roof Deck 81 PSF 99 PSF 159 PSF Structural Analysis W12X19 HSS 4x4x3/8 Conclusion Joists 329.2 PLF 401.2 PLF 472 PLF Girder Column Factored Load with Green Roof: 99 PSF Acknowledgments Girder 3.2 kips 3.9 kips 20 kips 1.5” 20 GA 3 ksi concrete 14K1 Series Steel Post Column 3.2 kips 3.9 kips 16 kips galv. Roof Deck Joists footing HSS Column 9.2 kips 11.3 kips 87 kips 3” Steel Pipe 15 PSF Column Soil 0.56 KSF 0.71 KSF 2.0 KSF • All structural members can safely accommodate new loading • No structural changes are necessary
Taylor Hall – George Mason University Fairfax, VA Bradley Williams - CM Introduction Conclusion Prevention Through Design Façade Re-design for PtD Summary of Results Stick-Built vs. Infinity System Green Roof Addition Analysis Result Conclusion Prevention through Design Reduced risk of injury over the building’s life Acknowledgments Façade Re-design More efficient fall safety measures Stick-Built Construction Cost effective solution for the D.C. area Green Roof Addition Educational opportunities and financial benefits $ ! Renderings courtesy of Gensler
Taylor Hall – George Mason University Fairfax, VA Bradley Williams - CM Introduction Acknowledgments Prevention Through Design Façade Re-design for PtD Stick-Built vs. Infinity System • Family and Friends Green Roof Addition • John Risley, Contractor Safety Coordinator of PSU OPP Conclusion • Professors and Faculty of the Architectural Engineering department Acknowledgments Questions? Renderings courtesy of Gensler
Appendix Taylor Hall – George Mason University Fairfax, VA Bradley Williams - CM Introduction Prevention Through Design Façade Re-design for PtD Stick-Built vs. Infinity System Green Roof Addition Conclusion Acknowledgments Green Roof Study conducted by the U.S. General Services Administration
Appendix Taylor Hall – George Mason University Fairfax, VA Bradley Williams - CM Introduction Prevention Through Design Façade Re-design for PtD Stick-Built vs. Infinity System Green Roof Addition Conclusion Acknowledgments
Appendix Taylor Hall – George Mason University Fairfax, VA Bradley Williams - CM Introduction Prevention Through Design Façade Re-design for PtD Stick-Built vs. Infinity System Green Roof Addition Conclusion Acknowledgments
Appendix Taylor Hall – George Mason University Fairfax, VA Bradley Williams - CM Introduction Prevention Through Design Façade Re-design for PtD Stick-Built vs. Infinity System Green Roof Addition Conclusion Acknowledgments
Appendix Taylor Hall – George Mason University Fairfax, VA Bradley Williams - CM Introduction Prevention Through Design Façade Re-design for PtD Stick-Built vs. Infinity System Green Roof Addition Conclusion Acknowledgments
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