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

Charles Miller WestEnd 25 Construction Option Spring 2009 ‐ Dr. Riley WestEnd 25

Outline � Project Background � Concrete � Façade � WestEnd 25 Background WestEnd 25 � LEED � Conclusions � Concrete Placement � Acknowledgement � Questions � Precast Façade � LEED Charles Miller Spring 2009 ‐ Dr. Riley � Conclusions Construction Option � Acknowledgements � Questions WestEnd 25

Outline � Project Background � Concrete � Façade WestEnd 25 � LEED � Conclusions � Function: Residential Apartments � Acknowledgement � Questions � Size: 324,000 sq. ft. / 10 stories � Project Cost: $76 Million Charles Miller Spring 2009 ‐ Dr. Riley � Construction Period: March 2007 – January 2009 Construction Option WestEnd 25 � Owner: Vornado ‐ Charles E. Smith � Contractor: James G. Davis Construction � Architect: Shalom Baranes Associates Architects WestEnd 25

Outline � Project Background � Concrete � Façade WestEnd 25 � LEED � Conclusions � Existing: � Acknowledgement � Questions � Two 6 story office buildings Structural Concrete Slabs: � Precast Façade Added Levels: 6” Post ‐ Tensioned Exterior Façade: � Concrete Structural System Charles Miller Spring 2009 ‐ Dr. Riley Metal Panels Connection: 7.5” Post ‐ Tensioned Construction Option Brick Facade Curtain Wall � New Construction: Existing: 7.5” Conventionally Reinforced � One 10 story apartment building � Curtain wall and Brick Facade � Concrete Structural System WestEnd 25

Outline � Structural System: � Project Background ▪ Existing: � Concrete � Façade ▫ 6 Stories Concrete � Placement Method: WestEnd 25 � LEED � Conclusions ▪ Crane and Bucket � Acknowledgement � Questions � Suggested Placement: ▪ Concrete Pump ▪ New Construction: Charles Miller Spring 2009 ‐ Dr. Riley ▫ Faster Installation Construction Option ▫ 6 Connectors � Schedule ▫ 4 Stories Concrete � Cost WestEnd 25

Outline � Project Background � Concrete � Façade � Schedule Comparison: WestEnd 25 � LEED � Same Connector Slab Duration � Conclusions � Acknowledgement � Pump Saves 2 Days per Full Slab � Questions Charles Miller Spring 2009 ‐ Dr. Riley Construction Option WestEnd 25

Outline � Project Background � Concrete � Façade � Placement Schedule Effects Timeline: WestEnd 25 � LEED Crane and Bucket: � Conclusions � Acknowledgement 9/1/08 10/1/08 11/1/08 12/1/08 1/1/09 7/1/08 8/1/08 � Questions Charles Miller Spring 2009 ‐ Dr. Riley Construction Option 7/3/08 10/14/08 8/15/08 10/8/08 12/1/08 12/11/08 4 Days 8 Days 10 Days 7/18/08 12/26/09 1/9/09 1/1/09 7/1/08 8/1/08 9/1/08 10/1/08 11/1/08 12/1/08 Pump: WestEnd 25

Outline � Project Background � Concrete � Façade � Cost: � Conclusion: WestEnd 25 � LEED � Conclusions ▪ Connecting Slabs Limit Efficiency Item Quantity Cost Basis Total Cost � Acknowledgement Crane and Bucket 4,106 CY Equipment = ▪ Pump Benefits on Full Slabs � Questions Placement $7,000/week $193,375 Labor = $13/ CY ▪ Limited Overall Savings Pump Placement 4,106 CY $18.20/ CY $74,750 Charles Miller Spring 2009 ‐ Dr. Riley Cost Difference $118,625 Familiar but slower method is acceptable Construction Option Supplemental $650/day ($85,150) Crane: For 131 days Net Savings: $33,475 General Conditions $5,925/day $59,250 Savings For 10 days Total Savings: $92,725 � Potential savings of $92,725 � .12% of Project Cost WestEnd 25

Outline � Project Background � Concrete � Façade � Original Façade WestEnd 25 � LEED ▪ Precast � Conclusions � Acknowledgement � Questions � Specified Façade ▪ Brick Cavity Wall ▪ Poor Slab Edges Charles Miller Spring 2009 ‐ Dr. Riley Construction Option � Precast Façade ▪ Schedule ▪ Cost ▪ Thermal Performance ▪ Structural Loads WestEnd 25

Outline � Project Background � Concrete � Façade � Productivity Analysis � Precast Benefits: WestEnd 25 � LEED ▪ CE 533 – Construction Productivity Analysis and Performance � Conclusions ▪ Faster Installation � Acknowledgement Evaluation ▪ Less Delays due to Weather � Questions Activity in Progress Charles Miller Spring 2009 ‐ Dr. Riley � Analysis Expectations Construction Option ▪ Late Winter Weather Delays Report Quantities Report Workhours Calculate Productivity Performance Evaluation WestEnd 25

Outline � Project Background � Concrete Brick Productivity � Façade � Productivity Chart WestEnd 25 � LEED 0.30 � Conclusions ▪ 3 Peaks of Decreased Productivity 0.25 � Acknowledgement � Questions ▫ One Weather Related 0.20 wh / sq. ft. ▫ Two Delays from Other Trades Uncompleted Work 0.15 ▪ Data Point Majority Below Baseline 0.10 Charles Miller Spring 2009 ‐ Dr. Riley Construction Option 0.05 ▫ Better than Expected Productivity 0.00 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 Day Productivity Baseline Productivity � Analysis Shows Limited Benefits due to Weather Delays = Weather Delay = Other Trade Delay WestEnd 25

Outline � Project Background � Concrete � Façade � Precast Sequencing: � Brick Sequencing: WestEnd 25 � LEED � 1 st floor North � Conclusions � North Facade � Schedule Comparison: � Acknowledgement � 1 st floor East � East Facade � Questions � 1 st floor South � South Facade � 2 nd floor North Charles Miller Spring 2009 ‐ Dr. Riley � 2 nd floor East Construction Option � Etc… WestEnd 25

Outline � Project Background � Concrete � Façade � Cost: WestEnd 25 � LEED � Conclusions Item Quantity Cost Basis Total Cost � Acknowledgement � Questions Budget Estimate: Labor = $489,000 Brick Façade 23,030 sq. ft. Material Estimate = $416,000 $1,036,250 Equipment = $131,250 Precast Facade 23,030 sq. ft. $35/sq.ft. $806,050 Charles Miller Spring 2009 ‐ Dr. Riley Construction Option Difference: $230,200 Demolition Extra Work: $77,000 Total Savings: $307,200 � Conclusion: ▪ Cost Savings Must be Weighed Against Risk of Difficult Installation ▫ Feasibility Depends on Crew WestEnd 25

Outline � Project Background � Concrete Precast Façade: Traditional Brick Façade: � Façade � U ‐ Value Comparison WestEnd 25 � LEED Layer R – Value ((hr*ft 2 * o F)/Btu ) R ‐ Value ((hr*ft 2 * o F)/Btu ) Layer � Conclusions ▪ Coefficient of Heat Transfer � Acknowledgement Exterior Air Film 0.17 � Questions Exterior Air Film 0.17 ▪ Lower Value Better 4 in. Face Brick 0.80 6” Concrete 0.60 2” Rigid Insulation 10.00 1.5” Air Space 0.93 5/8” Gypsum Board 0.56 Charles Miller Spring 2009 ‐ Dr. Riley 2” Rigid Insulation 10.00 � Precast Option is Thermally Feasible Construction Option Framing Cavity 9.0 5/8” Gypsum Board 0.56 1/2" Gypsum Board 0.45 Framing Cavity 9.0 Interior Air Film 0.68 1/2” Gypsum Board 0.45 Total 21.46 Interior Air Film 0.68 U ‐ Value 0.047 Total 22.59 U ‐ Value 0.044 WestEnd 25

Outline � Project Background � Concrete � Façade � Structural Analysis WestEnd 25 � LEED � Conclusions ▪ pca Column � Acknowledgement � Questions Load Calculation Total 150lbs/ft 3 (.5ft)(1ft)(10.6ft)=795lbs/ftwidth Panel 9,540 lbs Charles Miller Spring 2009 ‐ Dr. Riley 795lbs/ftwidth(12ftwidth) Construction Option (0.625ft)(150lb/ft 3 )=93.75lbs/ft 2 Concrete 22,089 lbs 93.57lb/ft 2 (200ft 2 )+(22.5ft 3 )(150lbs/ft 3 ) Wind 43psf(1ft)(10.6)=455.8lbs/ftwidth 5,469.6 lbs 455.8lbs/ftwidth(12ftwidth) Floor 40psf + 20psf =60psf 12,000 lbs 60psf(200 ft 2 ) � Precast Structurally Feasible WestEnd 25

Outline � Project Background � Concrete � Façade � Façade Conclusion WestEnd 25 � LEED � Conclusions ▪ Thermal Analysis and Structural Analysis Prove the � Acknowledgement � Questions Precast Façade is Feasible ▪ Cost Savings Must be Weighed Against Risk of Difficult Installation Charles Miller Spring 2009 ‐ Dr. Riley Construction Option ▫ Feasibility Depends on Crew WestEnd 25

Outline � Project Background � Concrete � Façade � Critical Industry Issue: 2008 PACE Roundtable Breakout WestEnd 25 � LEED � Conclusions Session: LEED Evolution � Acknowledgement ▪ Increase Owner Involvement � Questions � Interviews of Industry Professionals ▪ Series of Open Ended Questions Charles Miller Spring 2009 ‐ Dr. Riley Construction Option ▪ Interesting Results WestEnd 25

Outline � Project Background � Concrete � Façade � What do owners need to do differently? WestEnd 25 � LEED � Conclusions ▪ Few Felt that Owners Need to Increase Knowledge Base � Acknowledgement Owner Improvement � Questions ▪ Owners Need to Accept Costs and Improve Integration 45% 40% Charles Miller Spring 2009 ‐ Dr. Riley 35% Construction Option 30% 44% 25% 20% 33% 15% 10% 11% 5% 0% Accept Up ‐ Front Increase Improve Costs Knowledge Planning/Team Intergration WestEnd 25

Outline � Project Background � Concrete � Façade � What mistakes do owners typically make that cause WestEnd 25 � LEED � Conclusions problems for a project attempting a LEED Certification? Owner Mistakes � Acknowledgement ▪ Indecisiveness is a Major Problem � Questions 45% ▫ Owners Need to Set Clear Goals and Maintain Sustainability 40% Commitment 35% Charles Miller Spring 2009 ‐ Dr. Riley 30% ▪ Indecisiveness is a Larger Problem than Accepting Costs Construction Option 43% 25% 20% 29% 15% 10% 14% 5% 0% Change Waiting First Cost WestEnd 25