- Author
-
Rossiter, W. J., Jr.
|
Streicher, M. A.
|
Roberts, W. E.
- Title
- Corrosion of Metallic Fasteners in Low-Sloped Roofs: A Review of Available Information and Identification of Research Needs.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
Webster Farm, Wilmington, DE
Department of Energy, Washington, DC
- Report
-
NISTIR 88-4008
February 1989
105 p.
- Keywords
-
fasteners; corrosion; roofs; joining; durability; deterioration; roofing; research projects
- Abstract
- The paper presents the results of a study conducted to summarize available information on the corrosion issue, and to identify research needed to correct problems. In particular, the incidence of loss of fastener securement due to corrosion could not be established because of the inaccessibility of installed fasteners within roofs. In reviewing factors affecting fastener corrosion, water was the only one that stood out on the basis of the information obtained. Uniform corrosion (rust on some or all of the surface) was the predominant type that inspectors have observed in service. Nevertheless, some evidence of localized corrosion processes (e.g., crevice corrosion) has also been observed. Both types of corrosion may lead to loss of fastener securement in service. The results of the study indicated that there are three major gaps in the knowledge base: (1) evaluation test procedures for the corrosion resistance of fasteners are limited and need to be improved; (2) a data base on field performance of fasteners is lacking, and; (3) non-destructive diagnostic procedures for assessing the condition of inplace fasteners are not available.