Concrete Products

DEC 2018

Concrete Products covers the issues that attract producers of ready mixed and manufactured concrete focusing on equipment and material technology, market development and management topics.

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26 • December 2018 www.concreteproducts.com NEWS SCOPE BY DON MARSH New Design/Build Institute of Amer- ica-backed research finds that the design-build (DB) method delivers projects faster and with greater cost and schedule performance than Construction Management at Risk (CMR) and traditional Design-Bid- Build (DBB) alternatives. "As our nation continues to struggle with crumbling infrastructure and budgets stretched thin, it's no surprise that most states have embraced design-build as a better way to deliver projects vital to eco- nomic growth," says DBIA Executive Director Lisa Washington. "Whether it's a billion-dol- lar airport or small community library … design-build is clearly a better way to build." Authors of the "Revisiting Project Deliv- ery Performance — New benchmarks for unit cost, delivery speed, cost and schedule reliability" conclude that DB projects: Research finds design-build delivery continues to make the grade • Cost 1.9 percent and 0.3 percent less per square foot, respectively, than those using CMR and DBB; • Average 2.4 percent and 3.8 percent less cost growth than comparably scoped CMR and DBB work, respectively; • Perform best in terms of schedule growth, exhibiting respective levels 3.9 percent and 1.7 percent below those of CMR and DBB; • Are 13 percent and 36 percent faster than CMR and DBB, respectively, during the construction phase; and, • From design through completion, are delivered 61 percent and 102 percent faster, respectively, than CMR and DBB. The Charles Pankow Foundation and Con- struction Industry Institute (CII) supported the research, which factored data from 80 DB, 79 CMR and 53 DBB projects—131 public and 81 private. "Revisiting Project Delivery" findings build on "A Comparison of U.S. Project Delivery Systems," a 1998 study benchmarking the three methods. An eight-page research summary, authored by University of Colorado, Boulder Professor Keith Molenaar, PhD and University of Florida, M.E. Rinker, Sr. School of Construction Management Assistant Professor Bryan Franz, PhD is posted at www.dbia.org. PROJECT DELIVERY SPEEED Building square footage completed per month for Design-Bid-Build (DBB); Construction Manager at Risk (CMR) and Design-Build (DB) methods Reseachers found improving median rates for Construction Manager at Risk and De- sign-Bid-Build methods in the latest ver- sus the initial survey. Design-Build's lower median monthly building square footage, by contrast, reflects a different project mix between the two surveys: Among 1998 DB contracts, 28 percent were Light Industrial, including warehouses, parking structures and other facilities of low complexity and rapid construction potential. In the 2018 survey, only 9 percent of the DB projects were Light Industrial. SOURCE: "Revisiting Project Delivery Per- formance," CII/CPA 2018 1998 2018

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