REDUCING PROJECT COSTS THROUGH EFFECTIVE CONSTRUCTABILITY ... · Vanir Construction Management Inc....
Transcript of REDUCING PROJECT COSTS THROUGH EFFECTIVE CONSTRUCTABILITY ... · Vanir Construction Management Inc....
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REDUCING PROJECT COSTS THROUGH EFFECTIVE
CONSTRUCTABILITY REVIEWS
REDUCING PROJECT COSTS THROUGH EFFECTIVE
CONSTRUCTABILITY REVIEWS
A Pre-Construction Best Management Practice
Presenters:Troy Pyles, PE, Project DirectorJim Barger, Deputy Director of Review ServicesVanir Construction Management, Inc.
NWCCC Conference - November 8, 2006
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• Experience has shown that the ability to reduce project cost is much greater early in the life of a project
• Much of the opportunity is past once the project is out for bid.
• Constructability review during the design phase is a key to project success.
OVERVIEW
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• A structured review of the project and design documents to ensure:– Feasibility of construction– Design as represented in the plans and
specifications is biddable and constructible
WHAT IS A CONSTRUCTABILITY REVIEW?
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• Site Constraints– Access– Lay down areas– Availability of
utilities– Height restrictions
TWO TYPES OF REVIEWS
• Schedule Constraints– Duration– Allowable work hours– Sequencing– Time of year– Weather impacts
Feasibility Review – Early In Design
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• Resource Constraints– Materials– Labor– Equipment
TWO TYPES OF REVIEWS
Feasibility Review (cont.)
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• Bidable & Buildable• Looking for
– errors – omissions – ambiguities – conflicts
• Coordination
Detailed Document Review – Later In Design
TWO TYPES OF REVIEWS
• Complete instructions• Inclusion of:
– Permit requirements– Geotechnical study
recommendations– LEED analysis– Hazmat report
Sometimes referred to as a Bidability Review
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• Constructability Review– Looks at how the design is represented to the contractor– Is the contractor provided complete and unambiguous
instructions on what to build?
CLARIFICATION
• Design / Peer Review– Looks at the design per se– Is the design correct per engineering, architectural,
regulatory, and code standards & requirements?
• Coordination Review– Coordination of disciplines only
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A design is a unique, one time endeavor requiring scores of individuals making hundreds of decisions on thousands of building components. It does not have the benefit of product testing. A perfect design will not result.
A third party review will help!
WHY DO CONSTRUCTABILITY REVIEWS?
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WHY DO CONSTRUCTABILITY REVIEWS?
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WHY DO CONSTRUCTABILITY REVIEWS?
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Primary Benefits
• Reduces RFIs• Reduces change orders• Reduces likelihood of impact claims• Reduces impossible and impracticable
requirements
WHY DO CONSTRUCTABILITY REVIEWS?
Savings = $6 to $27 for each $1 invested in the review
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Primary Benefits (cont.)
• Cleaner contract documents =– More attractive project– More bids– Lower bids – less contingency
WHY DO CONSTRUCTABILITY REVIEWS?
More Savings!!
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Side Benefits• Less RFIs and Changes =
– More management on construction– Better relationships– Better attitudes
• Better quality• Better schedules• VE suggestions
WHY DO CONSTRUCTABILITY REVIEWS?
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REVIEW FORMATS
• Workshop– Better for VE– May catch big issues
• Independent Study– More detailed– Will find more issues
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• Compile documents• Team orientation• Site visit• Document review• A/E Review and Respond• Reconciliation Meeting• Back Check• Final Report
REVIEW PROCESS
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• Three sizes of generators• Leland Stanford’s tree• Overhead power line interference• Backflow preventer• Wrong soil elevation• Conflicting permits
EXAMPLE CONSTRUCTABILITY ISSUES
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• Civil pad elevations• Civil utility plans/plumbing site plans• Civil utility plans/landscape plans• Structural beams/HVAC ducts• Structural top of steel elevations• Structural/architectural• Gridlines & dimensions
EXAMPLE CONSTRUCTABILITY ISSUES
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• Site visit critical– As-builts poor– Designer & constructor perspectives differ
• Say it once – Say it right• Need to budget & schedule the review• Don’t hide the results
LESSONS LEARNED
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• Back check to get maximum value• Need qualified reviewers• Need a developed Review Methodology• Review with “eyes of a contractor”• Review team needs all disciplines
LESSONS LEARNED (con’t)
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• Benefits designer• Quality of documents is decreasing
– Less principal involvement– Cut and paste details– Workload too high
• There is no industry standard definition of “constructability review”
LESSONS LEARNED (con’t)
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• Why do a constructability review? I’m already paying the designer for good plans and specs.
FAQs
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• Should owner pay to have the designer make the corrections?
FAQs
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• How much does a constructability review cost?
FAQs
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• How long does a constructability review take?
FAQs
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• Can’t you just do a quick review and find all the big problems?
FAQs
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• When is the best time to do a review?FAQs
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• Our change order rate is only 10%, so why should we do constructability reviews?
FAQs
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• Do you spell it “constructability” or “constructibility”?
FAQs
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• While there will never be a perfect set of plans and specs, a constructability review will help improve the quality.
• A constructability review should be viewed as an investment, not an expense.
CONCLUSIONS
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QUESTIONS