Base sheet for roofing assembly
AssigneeBuilding Materials Corporation of America
InventorsBrent L. Grazman, William J. Woodring
Life of this patent
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Abstract
An improved base sheet for a roofing assembly wherein the base sheet is perforated with a plurality of apertures characterized by non-cylindrical cutouts in the shape of a closed figure or a polygon having at least two sides or boundaries of unequal length which aperture configuration permits strong attachment of the sheet to a substrate without the aid of auxiliary attachment means and without weakening of the base sheet structure.
Claims13
In a roofing assembly including a base sheet adapted to be adhesively attached to a substrate and having an asphaltic undercoating in which granules are embedded and spaced apertures through the sheet and adapted to allow flow of adhesive through the apertures onto the substrate, the improvement which comprises:
- a base sheet having modified apertures adapted to increase the bonding strength between the base sheet and the substrate without diminishing the strength of the sheet, said modified apertures characterized as non-cylindrical cutouts in the shape of a closed figure or a polygon having at least two sides or boundaries of unequal length.
Dependencies are inferred from the claim text.