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Seattle Cancer Research Center - Green Roof Installation

Construction management and cost analysis of implementing a green roof at the Fred Hutchinson Cancer Research Center in Seattle, Washington. Benefits include rainwater retention, lower surface temperature, and reduction of urban heat island effect.

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Seattle Cancer Research Center - Green Roof Installation

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  1. Architecture Zimmer Gunsul Frasca Partnership Construction Management Turner construction Company Structural KPFF Consulting Engineers Mechanical & Electrical Affiliated Engineers Inc. Robert M. Arnold BuildingFred Hutchinson Cancer Research Center 372,503 ft2 $90,825,000 Office Space Parking Garage Laboratories Project Team 1100 Fairview Seattle, Washington 2005 Masonry Honor Award LEED Certified Building

  2. Existing Structural System Typical Bay [30’ x 30’] 8 ½” Flat Plate w/ Drop Panels Post-Tensioned Distributed & Banded Tendons Plaza Cast in Place Reinforced Concrete Slab One-Way Slabs w/ Beams Beam Size Varies Gravity System 5th Floor Laboratories 13” Reinforced Concrete Slab Mechanical Level, Roof, & Penthouse Steel Framing W Shape Beams Rectangular HSS Columns

  3. Existing Structural System Reinforced Concrete Shear Walls 20” & 24” thick Special Boundary Elements Braced Frames (Upper Levels) Chevron Braces Lateral System Diagonal Braces X-Braces Seismic Controls Design Base Shear: 5980 kip

  4. Proposed Alternative Structural Design Proposal: Frame Main Portion of Building out of Steel Why?: Reduce Building Mass Improve Constructability Why Not the Entire Building: PLaza & Parking Garage Mechanical, Roof, & Penthouse

  5. New Structural System Typical Sizes W 16 x 26 W 16 x 31 Typical Sizes Typical Sizes W 24 x 55 W W 21 x 50 W Floor Framing Typical Live Load: 75 lb/ft2 Composite Beams • RAM Structural System Composite Girders Steel Columns

  6. New Structural System Columns – maintain location as per original design • Architectural Considerations EXCEPTION: 1 Column addition Minimal Architectural Impact Discontinued @ & below Level 1 Floor Framing

  7. Vibrations: Preliminary Analysis Evaluation for Walking Excitation • 5th Floor – Laboratory Area ap = 0.00408 < 0.005 Lab Equipment is more sensitive to vibration Second analysis recommended

  8. Braced Frames Concentrically Braced Frames Simplifying the Design Process Grouped Structure down to Level 5 Ordinary Braced Frames Special Braced Frames Columns: W14 Shapes X – Bracing: Rect.HSS columns

  9. Construction Management of Alternative Design Complete Building Cost Estimate was not completed- Steel Alternative Cost was Estimated using Integrate Cost Estimating Steel Alternative Cost was Estimated using Integrate Cost Estimating Overall savings $1.8 million

  10. Green Roof Retrofit • Benefits Rainwater Retention & Detention Offsets peak runoff from peak rainfall Lower roof surface temperature during summer helps to reduce the urban heat island effect Types of Green Roofs Extensive Semi-intensive Intensive Background Benefits Rainwater Retention & Detention Lower roof surface temperature during summer Helps to reduce the urban heat island effect

  11. Green Roof: Architectural Design • Potential Areas for Green Roof • Intensive • roof area accessible & viewable by the existing roof terrace • Extensive • upper roof • lower roof • None • stairwells • small area with limited access • mechanical enclosures • skylights • plaza • Green Roof Design Decision • Intensive • NONE • Intensive • All Potential Areas

  12. Green Roof: Architectural Design [Gardendrain GR 30] Roof Construction Sedum Planting Layer 6” Roof Lite Extensive MC Root Barrier Hydrotech Gardendrain GR 30 EPDM [ Water Proofing Membrane] Rigid Insulation

  13. Green Roof: Drainage Design Rainfall: 1 inch/hour Stormwater Runoff Rational Method (Runoff Model) Typical Roof: 0.95 Lawn (Sandy Soil): 0.10 LeaderSizing Based on Projected Area & Percentage of Vertical Surface Areas Does Not consider delayed runoff rate During sustained storm event rate can reach that of typical roof Total Drainage Area: 76,425 ft2 (28) 2 inch Leaders (14) 3 inch Leaders Total Drainage Rate: 19 gpm

  14. Green Roof: Construction Management Cost Analysis [RS Means Renovation & Maintenance] Replacement w/ Ballasted EPDM @ $4.55/ft2 = $253,000 Replacement w/ Green Roof @ $6.47/ft2 = $360,000 Life Cycle [50 year period] Ballasted EPDM: 3 @ $253,000 = $759,000 Extensive Sedum: 1 @ $360,000 = $360,000 Recommendation: Green Roof Installation @ Time of Replacement

  15. Questions ?

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