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Suggested Citation:"Introduction." National Academies of Sciences, Engineering, and Medicine. 2014. Guidelines for Ensuring Longevity in Airport Sound Insulation Programs. Washington, DC: The National Academies Press. doi: 10.17226/22439.
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Page 2
Suggested Citation:"Introduction." National Academies of Sciences, Engineering, and Medicine. 2014. Guidelines for Ensuring Longevity in Airport Sound Insulation Programs. Washington, DC: The National Academies Press. doi: 10.17226/22439.
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1 Introduction ACRP Project 02-31 was designed to provide a thorough investigation of airport sound insulation products and pro- cedures to identify possible causes for deterioration in sound insulation performance over the years. The investigation included researching project documents and identification of installation methods, treatments, and materials used in early projects. The plan was to define the chronology in the evolution of sound insulation programs in the United States, so that changes in methods and procedures from early to current programs and the relationship of these changes to changes in acoustic performance could be identified. The chronology was subsequently used to evaluate how program changes may have affected acoustic performance. This effort was followed by actual acoustical testing and architectural evaluations of a representative sample of dwelling units that were insulated in the early years. The purpose of this guidance document is to summarize the information collected and the analyses performed into practical guidelines that can be applied by program sponsors, designers, and contractors to improve the longevity of acoustic performance in airport sound insulation programs. Summary of ACRP Project 02-31 Findings on Deterioration The results of tests conducted at multiple sites of two sound insulation programs showed that there has been less deterioration in performance over the years than expected. This is consistent with the lack of reported deterioration in performance obtained from a survey of U.S. programs (Sharp, Gurovich, Fazeli, & Miller, 2013). In most cases, any deterioration in performance is more likely to be the result of homeowner modifications, poor maintenance, extreme weather, and, in some cases, poor installation, and less likely to be due to deterioration in the products themselves. This finding does not imply that there have been no prob- lems with products or installation procedures. Many programs have reported such issues, but, to a large extent, these have been identified by the program sponsors (or their consultants) and corrected by the product manufacturers or contractors. The lessons learned along the way have led to changes in products, installation, and quality control procedures that have reduced the frequency of such problems. Using ACRP Report 105 in Conjunction with Other Guidelines This report provides guidance on the materials, design criteria, installation criteria, and maintenance required to ensure longevity in sound insulation programs as well as describing the detailed steps necessary to prevent and/or address specific problems and the detailed inspection procedures needed to implement such programs. The guidelines presented in ACRP Report 89: Guidelines for Airport Sound Insulation Programs (Payne et al., 2013) cover program development, community outreach, design strategies, treatment of historical structures, green initiatives, and pro- gram cost development and funding. The report also includes some general information on construction and contracting, products, and closeout. This guidance document is a companion document to ACRP Report 89 with a focus on improving the durability and longevity of sound insulation programs. Sections 1 through 7 discuss the following areas: • Durability issues, • Program management, • Design process and bid documents, • Current and future products, • Construction administration, • Quality control, and • Maintenance.

2The sections are organized to discuss durability issues and the findings of other research projects and connect the findings to the day-to-day tasks of a sound insulation project from program management to project closeout and main- tenance. Although other guidelines are frequently referenced throughout this report, in some cases it was necessary to briefly discuss a topic in order to provide needed clarity and context. In addition, a short summary of best practice points as they relate to longevity is provided at the end of each section.

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TRB’s Airport Cooperative Research Program (ACRP) Report 105: Guidelines for Ensuring Longevity in Airport Sound Insulation Programs provides best practices in all phases of a sound insulation program to reduce or eliminate future deterioration issues.

ACRP Report 105 complements ACRP Report 89: Guidelines for Airport Sound Insulation Programs.

The contractor’s final report, which assesses sound insulation treatments as part of the first phase of the project that developed ACRP Report 105, is available for download.

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