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Mpls library-greenroof

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Published

Building Architects …

Building Architects
Pelli Associates, Design Architect
Architectural Alliance, Architect of Record

Green Roof Architect
Abraham + Associates Architects
Loren Abraham AIA, LEED AP, Lead Architect

Landscape Architects
Kestrel Design Group, Inc.
L. Peter MacDonagh, R.L.A., Lead Landscape Architect
Nathalie Hallyn, Project Manager

Roofing Consultant
Ambe Ltd.
Rick Grobovsky, Roofing Consultant

Construction Manager
Mortenson Construction

Roofing Contractor
Rosenquist Constrution

Irrigation Contractor
Green Acres
John Fiegle, Project Manager

Planting Contractor
Aloha Landscaping
John Darsow, Project Manager

Published in Design , Business , Technology
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  • 1. Minneapolis Central Library Green Roof Tour Minneapolis Central Library Green Roof
  • 2. Minneapolis Central Library Green Roof Tour Green Roof Technology and L. Peter MacDonagh, R.L.A. Adj. Asst. Professor, University of Minnesota The Kestrel Design Group, Inc. by Loren Abraham, A.I.A. Adj. Asst. Professor, University of Minnesota Abraham + Associates Architects 1313 5th St. SE, Ste 334 Minneapolis, MN 55414 labraham@abrahamarchitects.com
  • 3. Minneapolis Central Library Green Roof Tour WHY green roofs?  7 Key Water Quality Problems and BMPs  Roof longevity and energy savings  LEED and B3 Standards WHAT is green roof technology (GRT)?  Components of green roof systems.  Plant selection and research  Irrigation and management HOW are green roofs installed?  Photo History of Minneapolis Library Green Roof  Step by Step Process The finished product  The first year  The second year WHO designed and installed the Green Roof?  Architects and Landscape Architects  Contractors Outline
  • 4. Minneapolis Central Library Green Roof Tour Why Green Roofs?
  • 5. Minneapolis Central Library Green Roof Tour Why Green Roofs? 1. Excess Peak Runoff Volume 2. Floatables 3. Suspended Solids 4. Bacteria 5. Phosphorus 6. Chlorides 7. Nitrogen 7 Key Water Quality Issues Green Roofs help prevent
  • 6. Minneapolis Central Library Green Roof Tour Problems Associated with Impervious Surface Why Green Roofs? 20% shallow infiltration 15% deep infiltration 10% shallow infiltration 25% shallow infiltration 21% shallow infiltration 5% deep infiltration 25% deep infiltration 21% deep infiltration 40% evapotranspiritation 38% evapotranspiritation 35% evapotranspiritation 30% evapotranspiritation Natural Ground Cover 10-20% Impervious 75%-100% Impervious35-50% Impervious 10% runoff 20% runoff 30% runoff 55% runoff “The number one cause of water pollution is paving over earth.” Environmental Protection Agency Relationship Between Impervious Cover and Surface Runoff (adapted from FISRWG 1998 In Low Impact Development Strategies 1999) Source: Minnesota Urban Small Sites BMP Manual
  • 7. Minneapolis Central Library Green Roof Tour Problems Associated with Impervious Surface Why Green Roofs? Large storm Higher base flow Small storm Streamflowrate Higher and more rapid peak discharge More runoff volume Lower and loss rapid peak Gradual recession Time Predevelopment Postdevelopment Adapted From: Protecting Water Quality in Urban Areas. Best management Practices for Dealing with Storm Water Runoff from Urban and Suburban Developing Areas of Minnesota. MPCA 2000.
  • 8. Minneapolis Central Library Green Roof Tour Water Resources Benefits of GRT Why Green Roofs? Water Resources Focus:  Provides sustainable stormwater management— absorbs, slows, cleans and moderates temperature of runoff  Adds wildlife habitat Other Benefits:  Lowers energy costs for heating and cooling building  Improves urban air quality-reduces dust and smog levels  Extends roof life  Lessens urban heat island effect  Provides sound insulation  Improves aesthetics which produces psychological benefits Effect of green roof thickness on stormwater absorption Surface % Stormwater Retained 1‖ moss/sedum layer + 2‖ gravel 58% 2.5‖ sedum/grass layer 67% 4‖ grass + herbaceous vegetation 71% Green roofs are most beneficial for volume and rate control in areas with precipitation patterns like those found in Minneapolis: low annual precipitation short, high intensity storms (i.e. cloudbursts) that occur during dry weather periods
  • 9. Minneapolis Central Library Green Roof Tour Water Resources Benefits of GRT Why Green Roofs? Building on this research, the Twin Cities Metro is one of the BEST locations in this country for extensive GRT Source: Patrick Graham, Marian Kim, Evaluating the Stormwater Management Benefits of Green Roofs Through Water Balance Modeling, 2003.
  • 10. Minneapolis Central Library Green Roof Tour What is Green Roof Technology? Type 1: EXTENSIVE  Lower weight: (17-30lbs/sf saturated) _often additional structural support is not required.  Lower capital cost: $15-$30 per s.f. Depends on area, steepness, soil depth  Relatively Shallow Depth: 1" to 5―  Substrate: lightweight  Low maintenance: inspection 1-2 times/year  Supply of water and nutrients mainly by natural processes  Native, natural plant selection (plants adapted to drought and heat and wind)  Access: not designed for public use but can be accessed via walkways or for routine maintenance
  • 11. Minneapolis Central Library Green Roof Tour What is Green Roof Technology? Type 2: INTENSIVE  Increased weight: 30-100 lb per s.f.  Increased capital cost: $30+ per s.f.  Depth: usually 12‖ or more  Substrate: higher amount of organic material in layers >100 mm  Increased maintenance: depends on plant selection, e.g., mowing, fertilizing, watering, weeding  Intense planting: manicured landscapes, ornamental lawns, flowers, shrubs, trees, even organic gardening  Access: can be used as public park or building amenity  …and can include ponds, play areas, decks, patios, even a miniature golf course, etc.  Often found over underground garages.
  • 12. Minneapolis Central Library Green Roof Tour What is Green Roof Technology? Typical Native Soil Profile vs. Typical Green Roof Soil Profile (Source: Zinco) 1. Components Example 2: Xeroflor Prairie System Example of Typical GR Drainage System: Wet weight of system = 4.7 lb/ft2 Wet weight of 6‖ pea gravel = 60 lb/ft2 Source: Zinco Brochure Drainage element:  Recycled polyethylene  Water troughs on top side hold 0.1 gallons water/s.f.  Retained water is released into soil by evaporation or root uptake.  Holes in tops of troughs allow for air circulation, evaporation, and ventilation of soil and roots. Moisture Retention Mat:  Recycled polypropylene fibers  Retains 0.12 gallons water per square foot to promote root growth
  • 13. Minneapolis Central Library Green Roof Tour What is Green Roof Technology?  Tailor to structural loading capacity of building  pH, nutrients, porosity and water permeability needed by plants  Deep enough to protect plants from frost and compaction, and have a stable structure for root anchorage.  Resistant to wind and water erosion  Using pure native garden soil often results in problems when the soil degenerates from compaction and acidification.
  • 14. Minneapolis Central Library Green Roof Tour What is Green Roof Technology?  Perennial or self- seeding plants  Shallow, fibrous mat roots  Require no maintenance  Survive in shallow soil  Provide no ambient heat  Endure drought  High winds  Extreme sun exposure 3. Plants for EXTENSIVE Green Roofs
  • 15. Minneapolis Central Library Green Roof Tour What is Green Roof Technology? 3. Plants for EXTENSIVE Green Roofs Ruellia humilis Wild Petunia Source: http://www.prairienursery.com Tradescantia occidentalis Western Spiderwort Source: http://www.prairienursery.com Minnesota Plants Adapted to Green Roof Conditions
  • 16. Minneapolis Central Library Green Roof Tour What is Green Roof Technology? 3. Plants for EXTENSIVE Green Roofs European Green Roof Species Sedum floriferum ―Weinstephaner’s Gold‖ Sedum album ―Coral Carpet‖ Sedum ellacombianum Source: Intrinsic Perennials
  • 17. Minneapolis Central Library Green Roof Tour What is Green Roof Technology? 4. Irrigation  Irrigation is primarily for Plant Establishment & Building Cooling  Temporary Establishment of Plants is 2-3 Seasons (Spring, Summer, Fall)  Offers Peak Load Cooling on Flat Roofs in Summer (e.g., 1 story flat roofs)
  • 18. Minneapolis Central Library Green Roof Tour What is Green Roof Technology? 4. Irrigation for Plant Establishment  Plants need at minimum 1‖ of water per week June, July, August  Pan Evaporation is 2‖ per week June, July, August (MSP)  ¾‖ pipe = 2 to 3 GPM; 1‖ pipe = 5 to GPM
  • 19. Minneapolis Central Library Green Roof Tour Project Description Minneapolis Central Library Details  GR installed summer 2005.  3 roofs on two levels:  5th floor roof  Two on 2nd floor  Rainwater is collected and stored in two 7,500 gal. cisterns for irrigation.  All are extensive roofs that can be seen from inside the library and surrounding buildings.  Planting design includes 18 European and 39 native species.
  • 20. Minneapolis Central Library Green Roof Tour Photo History Photos  Roofing Installation  Flood Test  Insulation  Root Barrier  Drainage Membrane  Irrigation Systems  Growing Medium  Erosion Blanket  Plants - Plugs  Plants - Cuttings  Finished Roof Minneapolis Central Library
  • 21. Minneapolis Central Library Green Roof Tour Photo History Roofing Installation  Roofing Membrane  Flood Test  Insulation  Edge Tiles  Green Roof Edging Minneapolis Central Library
  • 22. Minneapolis Central Library Green Roof Tour Photo History Green Roof Layers  Root Barrier  Drainage Membrane  Irrigation Systems  Growing Medium  Erosion Blanket  Plants Minneapolis Central Library
  • 23. Minneapolis Central Library Green Roof Tour Photo History Irrigation Systems  Drip System  18‖ Grid  Supported mid- height  Emitters 18‖ spacing  Zoned valve boxes  Moisture sensor control  Spray (Pop-up)  Used on 2nd Floor roof – Facing South due to reflected sunlight intensity  18‖ high  Heat sensor control Minneapolis Central Library
  • 24. Minneapolis Central Library Green Roof Tour Photo History More Green Roof Layers  Growing Medium  Erosion Blanket Minneapolis Central Library
  • 25. Minneapolis Central Library Green Roof Tour Photo History Planting  Plants – Plugs  Sedums  Native plants  Plants - Cuttings Minneapolis Central Library
  • 26. Minneapolis Central Library Green Roof Tour Photo History Finished Roof  First Year (2005)  Second Year (2006)  Third Year (2007) Minneapolis Central Library
  • 27. Minneapolis Central Library Green Roof Tour Photo History Finished Roof  First Year (2005)  Second Year (2006)  Third Year (2007) Minneapolis Central Library
  • 28. Minneapolis Central Library Green Roof Tour Photo History Finished Roof  Third Year (2007) Minneapolis Central Library
  • 29. Minneapolis Central Library Green Roof Tour Building Architects  Pelli Associates, Design Architect  Architectural Alliance, Architect of Record Green Roof Architect  Abraham + Associates Architects  Loren Abraham AIA, LEED AP, Lead Architect Landscape Architects  Kestrel Design Group, Inc.  L. Peter MacDonagh, R.L.A., Lead Landscape Architect  Nathalie Hallyn, Project Manager Roofing Consultant  Ambe Ltd.  Rick Grobovsky, Roofing Consultant Construction Manager  Mortenson Construction Roofing Contractor  Rosenquist Constrution Irrigation Contractor  Green Acres  John Fiegle, Project Manager Planting Contractor  Aloha Landscaping  John Darsow, Project Manager Project Team