Mass Timber: Sustainable from All Perspectives Understand a mass - - PowerPoint PPT Presentation

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Mass Timber: Sustainable from All Perspectives Understand a mass - - PowerPoint PPT Presentation

Aug 07, 2023 377 likes •1.07k views

With Nordic With SA+R and KL&A Mass Timber: Sustainable from All Perspectives Understand a mass timber project through the eyes of a building owner, an architect, and a general contractor to understand why the material is so compelling

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Mass Timber: Sustainable from All Perspectives

With Nordic With SA+R and KL&A

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Understand a mass timber project through the eyes of a building owner, an architect, and a general contractor to understand why the material is so compelling across the industry.

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4 Learning Objectives

1) Benefits and challenges of building with mass timber compared to other structural systems. 2) Sustainability benefits of mass timber. 3) How to communicate about mass timber and respond to concerns about using mass timber. 4) Understand how mass timber contributes to LEED.

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Ryan Yaden

Associate Lake | Flato Architects

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MASS TIMBER CLIMATE CHANGE, BEAUTY + BIOPHILIA

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STICK FRAME Max 5 stories Must be covered Quality control

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TIMBER FRAME + DECKING

  • By code, lumber of a

certain size prescribed by code

  • Beauty
  • Code limitations
  • Acoustic limitations
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DIFFERENCE BETWEEN TIMBER AND MASS TIMBER Timber made up of smaller components like 2x4’s [or smaller] glued or pressed together. LOTS OF ACRONYMS: GLT CLT NLT DLT MPP T&G LVL PSL

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CLT CLT NL NLT GLT GLT DL DLT MPP MPP T& T&G

Mass Timber Suite

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ALBINA YARD

Mass Timber Suite

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MASS TIMBER: CROSS LAMINATED TIMBER - CLT Efficient, two-way structure Newer technologies, precision Dimensionally stable

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MURRY GROVE LONDON, UK Waugh Thistleton Architecture 9 story housing Completed 2009 CLT only Construction photo Simple kit of parts

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Carbon Focus – Embodied Carbon

Green Build | Whole Building LCA

END OF LIFE?

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Operational VS Embodied Carbon

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TIME VALUE OF CARBON

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LEED v4 Building Life Cycle Impact Reduction Credit

Option 4: Whole Building Life Cycle Assessment *measures reductions in environmental impacts as compared to a baseline building.

Impact Categories:

  • Global Warming Potential
  • Ozone Depletion Potential
  • Acidification Potential
  • Eutrophication Potential
  • Formation of Tropospheric Ozone
  • Non-Renewable Energy Consumption

*at least three of the six categories, including Global Warming Potential, must achieve this 10% reduction

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Carbon Leadership Forum Document: LCA Practice Guide

life cycle assessment calculation method for determining cradle to grave (extraction to disposal) embodied energy and environmental impacts

LCA

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Design Baseline 1 Floor slab 3-ply CLT panel

  • 3/4" acoustic mat
  • 3" concrete with fiber

mesh 3" concrete decking

  • 3" concrete with rebar

2 Column 11" Glulam HSS 8x8 steel column 3 Beams Glulam sized per drawings W16x26 steel beam 4 Shear walls 5-ply CLT panels 8" cast in place concrete with rebar reinforcement 5 Cladding Slate panels metal panels, 24 gauge steel, coated with flouropolymer paint

Option 2: Compare baseline design to the current design

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0% 20% 40% 60% 80% 100% 120% 140% Acidification Potential Total Eutrophication Potential Total Global Warming Potential Ozone Depletion Potential Smog Formation Potential Primary Energy Demand Non-renewable Energy Demand Renewable Energy Demand Mass Total

Denver Achievement Center LCA Comparison

Baseline TIMBER

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FORESTRY PRACTICES AND EMBODIED CARBON BEST CASE = FSC

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MASS TIMBER

Biophilia – quality of natural environment Fewer added materials and toxins, more efficiency Reduced greenhouse gas emissions

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CRAFT PLACEMAKING PERFORMANCE COMMUNITY

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HIGH PERFORMANCE + WELLNESS

Houston MFA Conservation Center

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UNIVERSITY OF DENVER BURWELL CARRIER ACHIEVEMENT CENTER

denver, colorado

SOTO OFFICE BUILDING

san antonio, texas

UNIVERSITY OF PENNSYLVANIA SEAS DATA SCIENCE BUILDING

philadelphia, pennsylvania

TRINITY UNIVERSITY HUMANITIES BUILDING

san antonio, texas

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CHALLENGES

  • 1. Limits of spans and cantilevers
  • 2. Weaker for heavy assemblies
  • 3. Localized comfort and knowledge
  • 4. Increased emphasis on coordination
  • 5. Assemblies listings limited
  • 6. Early commitment – DD/CD
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INTEGRATED DESIGN WORKSHOP

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Integrated Design Workshop at DU

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Integrated Design Workshop 80+ participants

Students, faculty, facilities, leadership Key goals included: Xeriscape and usable outdoor spaces Explore mass timber structure Maximize variety Universal design Explore Net zero energy User control Explore composting toilets

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COLLECT

  • STUDENTS
  • ALUMNI
  • ENTERPRISE
  • STICKY SPACES
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TIMBER BAY SIZING – 24’ GRID

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MINIMIZE FIBER VOLUME

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COORDINATE, COORDINATE, COORDINATE….

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SHOP DRAWINGS

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UNIVERSITY OF DENVER

BURWELL CAREER ACHIEVEMENT CENTER

denver, colorado SIZE: 23,000 SF BUDGET: $13.5 M Tracking LEED Platinum in construction: 2020 fall completion

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Ankit Sanghvi

Preconstruction Manager PCL Construction

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TIME LAPSE VIDEO

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PROCUREMENT: Manufacturer Selection

 Domestic vs. International Sourcing  Varying Panel Fabrication Size Limits  Engineering Support  Panel Width Shipping Constraints – Land vs. Sea  Proximity to Jobsite / Shipping Costs  Sustainability – FSC vs. SFI Certification  Aesthetic Considerations  Wood Species

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PROCUREMENT: Best Practices

 Early Go/No-Go Decision on Mass Timber  CM/GC design-assist  Early supplier selection vs. competitive bid  Optimize structural grid with supplier input  Maximize time for design coordination

  • Shop drawing release
  • MEP coordination
  • Fabrication lead time
  • Constructability reviews

 Transfer of Revit model to contractor

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MEP COORDINATION: Case Study – Wood Innovation Design Center

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MEP COORDINATION: Case Study – CSU Pavilion at Laurel Village

1st CLT project in Colorado (2014) LEED Platinum certification  No topping slabs at floor assembly  Rigid insulation at roof assembly  Long span, exposed ceilings  Extensive use of mockups

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MEP COORDINATION: Burwell Center for Career Achievement

Challenge: No exposed conduit!  Well defined space programming  Originally explored access flooring  3” topping slabs at floor & roof assembly  3D model ALL conduit  Penetration overlay with CLT shop drawings  Strategic placement of soffits & ceilings  Topping slab reinforcing

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MEP COORDINATION: Best Practices

 Identify aesthetic MEP routing goals early  Determine extent of flexibility required  Early transfer of REVIT model  Prioritize MEP penetration coordination  Consolidate MEP in soffits/ceilings  Maximize shop penetrations made with CNC machine in factory  Minimize field penetrations

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CONSTRUCTION TYPE ANALYSIS: III-A vs. III-B

Location of Event Space Rooftop 1st Floor Construction Type III-A III-B Assembly Group A-3 A-3 Fire Resistive Rating 1-Hr Not required Connections Concealed Exposed CLT Panel Thickness 5-Ply 3-Ply Superstructure Cost/SF $65/SF $53/SF

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CONSTRUCTION EFFICIENCIES: Reduced Waste

 Prefabricated components  Precision-fit  No scrap material or field cuts  Reduced deliveries / construction traffic  Smaller onsite workforce  Less impact on water quality / SWPPP

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CONSTRUCTION EFFICIENCIES: Site Planning

Targeted Goals:  Pick CLT panels directly off the trailer  Eliminate double-handling  Eliminate onsite storage of material  Eliminate back-up of deliveries Best Practices:  Align erection and fabrication sequence  Optimize lay down area & crane placement  Review onsite vs. offsite marshalling yard

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CONSTRUCTION EFFICIENCIES: Faster Schedule

40% Faster than Concrete!  Concurrent CLT core wall erection  Eliminate re-shores  Accelerated start of MEP rough-in  Reduced manpower & crew size  Prefabrication / precision-fit  Minimal weather protection  No temp heat required Erected in 6 weeks with 8 person crew

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James Rosner

Associate Vice-Chancellor University of Denver

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UNIVERSITY OF DENVER: Campus Overview

University Hall: 1892 Engineering/Computer Science: 2016

  • Founded in 1864
  • 11,500 students & 3,800 faculty/staff
  • 3.8 million square feet over 125 acres
  • Campus is a Working Arboretum
  • “Millennium” buildings built to a 100-

year standard

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Several LEED Gold and Silver Certified

  • “Great Private University dedicated to

the Public Good”

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Polling Question: What is the best way to gain support for the use of Mass Timber?

– Campus Carbon Neutrality Goal? – Campus Sustainability Goal? – Individual Building Performance Goal?

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  • Carbon Neutrality by 2050

–

24% reduction by 2020*

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45% reduction by 2025*

  • AASHE STARS Gold by 2020
  • “Green Fund” Projects

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Internally funded projects

–

5-year payback ROI

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Savings returned to fund

  • 5% on-site renewable energy

production by 2025

UNIVERSITY OF DENVER: Campus Energy and GHG Goals

784 kW Ritchie Center installation from Solar PPA *For scope I, II, and III emissions

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The Denver Advantage program is to build three new buildings focused on improving the student experience:

  • Big Question: How to meet GHG reduction goals with adding

285,900 GSF of new buildings?

UNIVERSITY OF DENVER: The Denver Advantage Program

N

DIMOND F AMIL Y RE SI DE NT I AL VIL L AGE 500 Be d s 130,699 GSF , $61.9 millio n COMMUNI T Y COMMONS Ce ntra l Dining , Stud e nt Se rvic e s 132,301 GSF , $79.8 millio n BURWE L L CE NT E R F OR CARE E R ACHIE VE ME NT Alumni Re la tio ns, Ca re e r Se rvic e s 22,904 GSF , $17 millio n

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  • Initial goals established by BOT during budget and financing

–

Class “B” building, not to DU’s traditional 100-year standard

–

LEED v4 Silver, no renewables

  • Aspirational goals emerged during design process

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Net Zero Building

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LEED v4 Platinum and Well Building Certified

  • Final goals decided upon to meet sustainability opportunities

–

Mass Timber

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Solar on site

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LEED v4 Platinum UNIVERSITY OF DENVER: Burwell Center Sustainability Goals

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  • DU’s first Mass Timber Building

–

Emerged as a means to reach LEED goal and project schedule

  • Solar: 62.7 kW Rooftop Array

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Net Zero not achievable due to limited project site and inability to cross property lines via regulation.

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Funded with the campus-wide Solar PPA with no cost to the project

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Incorporated as part of architectural roof design/mechanical screen

  • DU’s First LEED Platinum Building

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Green Fund brought $434,000 needed to meet goal

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Used opportunity for Platinum to “sell” MT and Solar to Trustees UNIVERSITY OF DENVER: Burwell Center Sustainability Goals

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UNIVERSITY OF DENVER: Burwell Center Sustainability Goals

BURWELL CENTER FOR CAREER ACHIVEMENT SCORECARD Y ? N

Location and Transportation 16 12 0 4 Sustainable Sites 10 4 4 2 Water Efficiency 11 1 9 1 Energy and Atmosphere 33 24 6 5 Materials and Resources 13 5 4 4 Indoor Environmental Quality 16 11 5 Innovation 6 6 Regional Priority - 80208 4 2 1 1

Totals 65 30 17 likely maybes to become "yes" 24 Platinum 80-110 89

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Watch our progress: https://app.oxblue.com/open/DU/Dashboard

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Q&A?

You must allow time for audience Q&A

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Ankit Sanghvi ASanghvi@pcl.com Ryan Yaden Ryaden@LakeFlato.com