Dual application of roofing granules to bituminous roofing material
AssigneeJohns Manville
InventorsCasey Hill, Shelby Kay Dewhurst, April Heath
Life of this patent
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Abstract
A method of manufacturing a bituminous roofing membrane may include saturating a nonwoven material with a bituminous material to form a bituminous membrane. The method may include applying a first granular material to a top surface of the bituminous membrane. The method may include removing at least some of the first granular material that has not adhered to the bituminous membrane. The method may include heating the bituminous membrane. The method may include applying a second granular material to the bituminous membrane while the bituminous membrane is in a generally planar configuration.
Claims20
A method of manufacturing a bituminous roofing membrane, comprising:
- saturating a nonwoven material with a bituminous material to form a bituminous membrane;
- applying a first granular material to a top surface of the bituminous membrane;
- removing at least some of the first granular material that has not adhered to the bituminous membrane;
- heating the bituminous membrane;
- and
- applying a second granular material to the bituminous membrane while the bituminous membrane is in a generally planar configuration.
A method of manufacturing a bituminous roofing membrane, comprising:
- saturating a nonwoven material with a bituminous material to form a bituminous membrane;
- applying a first granular material to a top surface of the bituminous membrane;
- pressing the first granular material into the top surface of the bituminous membrane;
- removing at least some of the first granular material that has not adhered to the bituminous membrane;
- heating the bituminous membrane;
- and
- applying a second granular material to the bituminous membrane while the bituminous membrane is in a generally planar configuration, wherein the first granular material has a greater average grain size than the second granular material.
A bituminous roofing membrane, comprising:
- a bituminous membrane comprising a nonwoven mat that is saturated with a bituminous material;
- a granular material that is disposed on a top surface of the bituminous membrane, the granular material covering at least 80% of the top surface of the bituminous membrane;
- and
- a backing layer affixed to a bottom surface of the bituminous membrane.
Dependencies are inferred from the claim text.