Non-slip built-up roofing
AssigneeChevron Research Company
InventorRobert J. Schmidt
Life of this patent
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Abstract
Built-up roofing employing precoated felts are inhibited from slipping by the use of bituminous emulsions to bind the felts. A minor amount of a compatible latex is incorporated into the emulsion to increase the adhesion of the bonded felts.
Claims14
In a built-up roof using at least two layers of asphalt-precoated felts in layers, the improvement comprised of said layers bound together by at least one binding layer of the residuum of an aqueous latex modified bituminous emulsion, in which (1) the weight ratio of the latex solids to bitumen is in the range of from 1:2.0-30 and (2) said binding layer has a thickness of from about 0.002 to about 0.01 inch.
In a process for preparing built-up roofing employing at least two asphalt-precoated felts the improvement comprised of:
- I. applying to the surfaces of said felts a modified bituminous emulsion at a rate of from 0.2 to 1.0 gallon per 100 square feet of surface, said modified bituminous emulsion comprised of (1) from 70 to 90 parts by weight of a bituminous emulsion having a residuum of from 40 to 70 percent by weight and (2) from 30 to 10 parts by weight of a latex having a solids content of from 20 to 70 percent by weight with the proviso that said modified bituminous emulsion has 100 total parts by weight, and
- Ii. contacting said felt sheets to bind said felts together.
Dependencies are inferred from the claim text.