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US 5,287,669 AGranted
Roofing shingle
AssigneeCertainTeed Corporation
InventorsMarcia G. Hannah, George W. Mehrer, Michael J. Noone, Kermit E. Stahl, Joseph Quaranta
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AssigneeCertainTeed Corporation
InventorsMarcia G. Hannah, George W. Mehrer, Michael J. Noone, Kermit E. Stahl, Joseph Quaranta
Estimating the term…
A roofing shingle is provided for shingling a roof with overlapped shingles, wherein the exposed portion of the shingle is selected to be of a height in the installed condition relative to the overall height of the shingle that enhances material utilization, to be at least approximately 44.4% efficient. This is accomplished by using an exposure height of 8 inches relative to an overall shingle height of 18 inches. The shingles are preferably constructed to have either 3 or 4 tabs, thereby having a ratio of exposure height to tab width of either 0.667 or 0.889, respectively. A larger exposure allows one to obtain 200 shingles for each 300 lineal feet of sheet shingle material, when the shingles have 18 inch overall height, and further allows an overall saving in the number of nails required to install a roof. The invention also contemplates variations in tab width within a given shingle and variations in number of tabs from about one to nine tabs in a given shingle.
A roof surfaced with shingles each having upper ends and lower ends and each having 18 inch overall height, and being laid-up in partially overlapping courses to leave lower ends of shingles exposed to a predetermined exposed height, with successive courses of said shingles overlapping upper ends of next underlying courses of shingles in amounts sufficient to provide 8 inch exposed height at lower ends of applied shingles.
A shingle having a tab portion adapted to be exposed when in the installed condition on a roof, a top portion above said tab portion, adapted to be covered in the installed condition and a headlap portion comprising the upper 2" of said top portion and adapted to be covered in the installed condition;
Dependencies are inferred from the claim text.