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Economic Impact of Improved Service-Life Prediction for Seams in Low-Slope EPDM Roofing

机译：低坡度EPDM屋面接缝使用寿命预测的改进对经济的影响

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In the early part of the 1970s, built-up roofing dominated the U.S. membrane roofing industry. It was estimated that 10 % to 15 % of these roofs failed prematurely, but by the early 1980s new membranes were being rapidly adopted. Among them, ethylene-propylene-diene terpolymer (EPDM) rubber, manufactured as preformed single-ply sheets ready for field installation, experienced the most rapid growth. Although performance was generally satisfactory, far too often, disbonding of seams occurred. National Institute of Standards and Technology (NIST) researchers developed a creep-rupture methodology to study the factors affecting seam performance including mechanical loading of the seam, thickness of the adhesive used to form the seam, and rubber surface cleanness of the rubber before the adhesive was applied. This research had a noteworthy impact on the EPDM roofing industry in that it accelerated changes to seam technology and increased users' confidence that EPDM would provide satisfactory long-term performance. This paper examines the economic impact of the research conducted by NIST's Service Life Prediction (SLP) Program for EPDM roofing. Three ASTM standards are used to calculate the value of NIST's research investment: (1) present value of net savings (PVNS) [ASTM E1074-09: Practice for Measuring Net Benefits and Net Savings for Investments in Buildings and Building Systems, Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA, 2012], (2) savings-to-investment ratio (SIR) [ASTM E964-06: Practice for Measuring Benefit-to-Cost and Savings-to-lnvestment Ratios for Buildings and Building Systems, Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA, 2012], and (3) adjusted internal rate of return (AIRR) [ASTM E1057-06: Standard Practice for Measuring Internal Rate of Return and Adjusted Internal Rate of Return for Investments in Buildings and Building Systems, Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA, 2012]. The results show that the PVNS attributable to NIST is $26.7 × 10~6 with an SIR of 2.5 and an AIRR of 13.7 %. Stated in present-value terms, every public dollar invested in NIST's SLP-related research, development, and deployment effort generated $2.5 in cost savings to the public.
机译：在1970年代初期，建成的屋面主导了美国膜屋面行业。据估计，这些屋顶中有10％到15％会过早失效，但是到1980年代初，新的薄膜被迅速采用。其中，以预制的单层片材形式生产的乙烯-丙烯-二烯三元共聚物（EPDM）橡胶可现场安装，其发展最快。尽管性能总体上令人满意，但通常会发生接缝的剥离。美国国家标准技术研究院（NIST）的研究人员开发了一种蠕变断裂方法，以研究影响接缝性能的因素，包括接缝的机械负载，用于形成接缝的胶粘剂的厚度以及胶粘剂之前的橡胶的橡胶表面清洁度已应用。这项研究对EPDM屋面行业产生了显着影响，因为它加快了接缝技术的变化，并增加了用户对EPDM可以提供令人满意的长期性能的信心。本文研究了NIST的EPDM屋面使用寿命预测（SLP）计划进行的研究对经济的影响。三种ASTM标准用于计算NIST的研究投资价值：（1）净节约现值（PVNS）[ASTM E1074-09：衡量建筑物和建筑物系统投资的净收益和净储蓄的实践，年鉴ASTM Standards，ASTM International，PA，West Conshohocken，2012年），（2）储蓄与投资比率（SIR）[ASTM E964-06：测量建筑物和建筑物的成本与成本之比的实践建筑系统，ASTM标准年鉴，ASTM International，宾夕法尼亚州西康斯霍肯，2012年]，以及（3）调整后内部收益率（AIRR）[ASTM E1057-06：测量内部收益率和调整后内部收益率的标准做法，《建筑和建筑系统投资回报》，ASTM标准年鉴，ASTM国际组织，宾夕法尼亚州西康肖霍肯，2012年]。结果表明，归因于NIST的PVNS为$ 26.7×10〜6，SIR为2.5，AIRR为13.7％。以现值计算，在NIST与SLP相关的研究，开发和部署工作中投入的每一公共资金，将为公众节省2.5美元。

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