Bituminized roof sheet
AssigneeHoechst Aktiengesellschaft
InventorsWolfgang Gessner, Helmut Kuhn, Kurt Plotz
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Abstract
The flame resistance of a bituminized roof sheet consisting of a reinforced fleece, a metal foil and bitumen is improved substantially by applying a metal foil to one face. A rupture of the metal foil in the case of stress due to elongation is prevented by wrinkling it. The elongation reserve thus obtained is in the range of from 2 to 35%.
Claims21
A process for the production of a roof sheet, including a fleece, metal foil and bitumen, which comprises attaching the metal foil to the fleece to obtain a composite structure, thereafter shrinking the fleece from 2 to 35 percent by exposing the attached fleece and foil to hot air, whereby the foil becomes wrinkled, and bituminizing at least one surface of the composite structure.
Dependencies are inferred from the claim text.