WestEnd 25 Outline Project Background Concrete Faade WestEnd 25 - - PDF document

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WestEnd 25 Outline Project Background Concrete Faade WestEnd 25 - - PDF document

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Charles Miller WestEnd 25 Construction Option Spring 2009 Dr. Riley WestEnd 25 Outline Project Background Concrete Faade WestEnd 25 Background WestEnd 25 LEED Conclusions Concrete Placement Acknowledgement

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SLIDE 1

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

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SLIDE 2

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

WestEnd25 Background Concrete Placement Precast Façade LEED Conclusions Acknowledgements Questions

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SLIDE 3

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Function:

Residential Apartments

Size:

324,000 sq. ft. / 10 stories

Project Cost:

$76 Million

Construction Period:

March 2007 – January 2009

Owner: Vornado ‐ Charles E. Smith Contractor:

James G. Davis Construction

Architect:

Shalom Baranes Associates Architects

WestEnd25

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SLIDE 4

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Curtain Wall Exterior Façade: Brick Facade Metal Panels

Existing:

Two 6 story office buildings Precast Façade Concrete Structural System

New Construction:

One 10 story apartment building Curtain wall and Brick Facade Concrete Structural System

Connection: 7.5” Post‐Tensioned Structural Concrete Slabs: Added Levels: 6” Post‐Tensioned Existing: 7.5” Conventionally Reinforced

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SLIDE 5

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Placement Method:

▪ Crane and Bucket

Suggested Placement:

▪ Concrete Pump

▫ Faster Installation

Schedule Cost

Structural System:

▪ Existing:

▫ 6 Stories Concrete

▪ New Construction:

▫ 6 Connectors ▫ 4 Stories Concrete

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SLIDE 6

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Schedule Comparison: Same Connector Slab Duration Pump Saves 2 Days per Full Slab

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SLIDE 7

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Placement Schedule Effects Timeline:

10/8/08 12/11/08 1/9/09 8/1/08 9/1/08 10/1/08 11/1/08 8/1/08 9/1/08 10/1/08 11/1/08 12/1/08 7/18/08 7/1/08 7/3/08 8/15/08 12/1/08 12/26/09 1/1/09 10/14/08 4 Days 12/1/08 8 Days 10 Days 7/1/08 1/1/09

Crane and Bucket: Pump:

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SLIDE 8

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Conclusion:

▪ Connecting Slabs Limit Efficiency ▪ Pump Benefits on Full Slabs ▪ Limited Overall Savings

Familiar but slower method is acceptable

Item Quantity Cost Basis Total Cost Crane and Bucket Placement 4,106 CY Equipment = $7,000/week Labor = $13/ CY $193,375 Pump Placement 4,106 CY $18.20/ CY $74,750 Cost Difference $118,625 Supplemental Crane: $650/day For 131 days ($85,150) Net Savings: $33,475 General Conditions Savings $5,925/day For 10 days $59,250 Total Savings: $92,725 Potential savings of $92,725 .12% of Project Cost

Cost:

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SLIDE 9

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Original Façade

▪ Precast

Specified Façade

▪ Brick Cavity Wall ▪ Poor Slab Edges

Precast Façade

▪ Schedule ▪ Cost ▪ Thermal Performance ▪ Structural Loads

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SLIDE 10

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Productivity Analysis

▪ CE 533 – Construction Productivity Analysis and Performance Evaluation

Activity in Progress Report Quantities Report Workhours Calculate Productivity Performance Evaluation

Analysis Expectations

▪ Late Winter Weather Delays

Precast Benefits:

▪ Faster Installation ▪ Less Delays due to Weather

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SLIDE 11

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Productivity Chart

▪ 3 Peaks of Decreased Productivity

▫ One Weather Related ▫ Two Delays from Other Trades Uncompleted Work

▪ Data Point Majority Below Baseline

▫ Better than Expected Productivity

Analysis Shows Limited Benefits due to Weather Delays

0.00 0.05 0.10 0.15 0.20 0.25 0.30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 wh / sq. ft. Day

Brick Productivity

Productivity Baseline Productivity = Weather Delay = Other Trade Delay

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SLIDE 12

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Schedule Comparison: Brick Sequencing: 1st floor North 1st floor East 1st floor South 2nd floor North 2nd floor East Etc… Precast Sequencing: North Facade East Facade South Facade

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SLIDE 13

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions Item Quantity Cost Basis Total Cost Brick Façade 23,030 sq. ft. Budget Estimate: Labor = $489,000 Material Estimate = $416,000 Equipment = $131,250 $1,036,250 Precast Facade 23,030 sq. ft. $35/sq.ft. $806,050 Difference: $230,200 Demolition Extra Work: $77,000 Total Savings: $307,200

Cost: Conclusion:

▪ Cost Savings Must be Weighed Against Risk of Difficult Installation ▫ Feasibility Depends on Crew

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SLIDE 14

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

U‐Value Comparison

▪ Coefficient of Heat Transfer ▪ Lower Value Better

Precast Option is Thermally Feasible

Layer R – Value ((hr*ft2*oF)/Btu ) Exterior Air Film 0.17 4 in. Face Brick 0.80 1.5” Air Space 0.93 2” Rigid Insulation 10.00 5/8” Gypsum Board 0.56 Framing Cavity 9.0 1/2” Gypsum Board 0.45 Interior Air Film 0.68 Total 22.59 U‐Value 0.044 Traditional Brick Façade: Layer R ‐ Value ((hr*ft2*oF)/Btu ) Exterior Air Film 0.17 6” Concrete 0.60 2” Rigid Insulation 10.00 5/8” Gypsum Board 0.56 Framing Cavity 9.0 1/2" Gypsum Board 0.45 Interior Air Film 0.68 Total 21.46 U‐Value 0.047 Precast Façade:

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SLIDE 15

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Structural Analysis

▪ pca Column

Precast Structurally Feasible

Load Calculation Total Panel 150lbs/ft3(.5ft)(1ft)(10.6ft)=795lbs/ftwidth 795lbs/ftwidth(12ftwidth) 9,540 lbs Concrete (0.625ft)(150lb/ft3)=93.75lbs/ft2 93.57lb/ft2(200ft2)+(22.5ft3)(150lbs/ft3) 22,089 lbs Wind 43psf(1ft)(10.6)=455.8lbs/ftwidth 455.8lbs/ftwidth(12ftwidth) 5,469.6 lbs Floor 40psf + 20psf =60psf 60psf(200 ft2) 12,000 lbs

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SLIDE 16

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Façade Conclusion

▪ Thermal Analysis and Structural Analysis Prove the Precast Façade is Feasible ▪ Cost Savings Must be Weighed Against Risk of Difficult Installation

▫ Feasibility Depends on Crew

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SLIDE 17

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Critical Industry Issue: 2008 PACE Roundtable Breakout

Session: LEED Evolution ▪ Increase Owner Involvement

Interviews of Industry Professionals

▪ Series of Open Ended Questions ▪ Interesting Results

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SLIDE 18

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

0% 5% 10% 15% 20% 25% 30% 35% 40% 45%

Accept Up‐Front Costs Increase Knowledge Improve Planning/Team Intergration 44% 11% 33%

Owner Improvement

What do owners need to do differently?

▪ Few Felt that Owners Need to Increase Knowledge Base ▪ Owners Need to Accept Costs and Improve Integration

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SLIDE 19

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

What mistakes do owners typically make that cause

problems for a project attempting a LEED Certification? ▪ Indecisiveness is a Major Problem

▫ Owners Need to Set Clear Goals and Maintain Sustainability Commitment

▪ Indecisiveness is a Larger Problem than Accepting Costs

0% 5% 10% 15% 20% 25% 30% 35% 40% 45%

Change Waiting First Cost 29% 43% 14%

Owner Mistakes

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SLIDE 20

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

What do owners do that is successful and helps the

  • verall project?

▪ Successful Owners Clearly State Sustainability Goals and Maintain Their Commitment to Sustainability

0% 10% 20% 30% 40% 50% 60% 70% 80% 90%

Goals and Commitment Hiring Managing Agent 86% 14%

Owner Best Practices

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SLIDE 21

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

How important is the selection of a design professional

that has experience and expertise with sustainable design? ▪ All Participant Indicated Importance of Sustainable Experience ▪ 63% Indicated a Level of “Extreme” Importance

0% 10% 20% 30% 40% 50% 60% 70%

Helpful Critical 38% 63%

Design Professional Expeirence

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SLIDE 22

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

What design decisions are typically passed over without

early owner commitment to LEED? ▪ Owners Typically Own Land Before Deciding to Build

0% 10% 20% 30% 40% 50% 60% 70% 80%

Site Selection Intergrated Design 75% 25%

Missed LEED Points

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SLIDE 23

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Research Findings

▪ Changes/Waiting Deterrent ▪ Clear Goals and Commitment ▪ Designer Critical

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SLIDE 24

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Concrete Placement

▪ Familiar but Slower Concrete Placement Method is Acceptable

Façade Analysis

▪ Thermal Analysis and Structural Analysis Prove the Precast is Feasible ▪ Cost Savings Must be Weighted Against Risk of Difficult Installation

LEED

▪ Research Findings

▫ Changes/Waiting Deterrent ▫ Clear Goals and Commitment ▫ Designer Critical

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SLIDE 25

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions

Vornado/Charles E. Smith James G. Davis Construction AE Faculty Survey Participants Family & Friends

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SLIDE 26

Charles Miller

Construction Option Spring 2009 ‐ Dr. Riley

WestEnd25

WestEnd25

Outline

Project Background Concrete Façade LEED Conclusions Acknowledgement Questions