National Research Council of Canada. NRC Institute for Aerospace Research
Text, Technical Report
This report is concerned with wind tunnel tests of two protected membrane roofing systems in which insulation boards are loosely laid over the water-impermeable membrane. The tests were carried out to investigate the resistance of these systems to damage by high winds when they are installed on high-rise buildings. These tests are an extension of earlier tests conducted for low-rise buildings. A number if variants of each system were tested and the observed wind speeds for failure are presented. Failure modes are described. Failure can be by gravely scour when gravel is used, or by uplift of insulation boards or pavers. Uplift is caused by pressure difference which can develop across boards or pavers located in regions where the pressure distribution produced by flow over the building is highly non-uniform. High parapets are very effective for reducing susceptibility to wind damage. Mechanical interconnection of insulation boards or pavers is also effective.
National Research Council of Canada. National Aeronautical Establishment
Laboratory Technical Report (National Research Council of Canada. National Aeronautical Establishment), no. LTR-LA-269.