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Abstract
The Trondheim Division of the Norwegian Building Research Institute (NBI) has been engaged in roofing research since the 1950s. For flat roofs with flexible roofing, field investigation techniques were originally used as a basis for subsequent revision of recommended codes of practice. At the beginning of the 1970s, the need for laboratory testing and evaluation became more evident. Backed by the industry, NBI set out to build a multifunction roof testing apparatus with test programs for wind uplift strength, simulated aging and accelerated aging. The apparatus and the results of the initial research were presented at ISRR, Brighton, 1974. During the '70s, the apparatus was extensively used for wind uplift strength research and commercial testing. The standard method for testing the wind uplift strength of roof assemblies was proposed for adoption as the Nordtest Method and finally approved at NT BUILD 307 in 1986. The first part was carried out in 1989 using single-ply polymeric membranes. Asphalt felt membranes were included in the last run in 1991 to cover the widest possible range of loosely applied, mechanically attached systems. This article outlines the research project, discusses the results and gives documentation for establishing the test methods NBI 162/90.
The Trondheim Division of the Norwegian Building Research Institute (NBI) has been engaged in roofing research since the 1950s. For flat roofs with flexible roofing, field investigation techniques were originally used as a basis for subsequent revision of recommended codes of practice. At the beginning of the 1970s, the need for laboratory testing and evaluation became more evident. Backed by the industry, NBI set out to build a multifunction roof testing apparatus with test programs for wind uplift strength, simulated aging and accelerated aging. The apparatus and the results of the initial research were presented at ISRR, Brighton, 1974. During the '70s, the apparatus was extensively used for wind uplift strength research and commercial testing. The standard method for testing the wind uplift strength of roof assemblies was proposed for adoption as the Nordtest Method and finally approved at NT BUILD 307 in 1986. The first part was carried out in 1989 using single-ply polymeric membranes. Asphalt felt membranes were included in the last run in 1991 to cover the widest possible range of loosely applied, mechanically attached systems. This article outlines the research project, discusses the results and gives documentation for establishing the test methods NBI 162/90.
Date
0/1992
0/1992
Author(s)
Elnar Paulsen
Elnar Paulsen
Page(s)
431-443
431-443
Keyword(s)
wind uplift; accelerated aging; dynamic load test; mechanically attached roof
wind uplift; accelerated aging; dynamic load test; mechanically attached roof