Ballasted Single Ply Design Guide Development

by David L. Roodvoets, Dow Chemical Co, United States,

Document Type: Proceeding Paper

Part of: Structural Design, Analysis and Testing


A new roofing concept called ballasted single ply has now captured about 25% of the new and retrofit flat roof market. This concept relies on the use of ballast to provide the wind resistance for the system. The amount of ballast required is far less than would be predicted as the weight required to overcome the uplift forces on the roof. Because the code requirements based on the weight displacement factor would be overly restrictive the single ply industry has submitted a proposed industry standard that realistically provides design factors for ballast for single ply systems. The design for ballasted systems was based on wind tunnel data, field studies, historical warrantee records and direct observation of the committee participants. This information is further discussed in this paper.

Subject Headings: Railroad ballast | Field tests | Industries | Wind tunnel | Roofs | Structural design | Wind forces | Business management

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