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In a rectangular composite shingle unit including (a) a top sheet having a lower butt portion which is longitudinally divided into spaced tabs and an upper undivided headlap portion having a horizontal line of markings immediately above the butt portion indicating nailable sites for attachment of th

In a rectangular composite shingle unit including (a) a top sheet having a lower butt portion which is longitudinally divided into spaced tabs and an upper undivided headlap portion having a horizontal line of markings immediately above the butt portion indicating nailable sites for attachment of the shingle unit to a roof deck and (b) a continuous, elongated backer strip underlying the tabs and nail markings of the headlap which is aligned in offset or flush position along the longitudinal margin of the butt portion and which extends from the bottom edges of the tabs to the top area of the nail line markings; the improvement which comprises a backer strip having a plurality of extended projections on the top longitudinal margin of said backer which projections are spaced apart and vertically extend upwardly beyond the nail line markings and underlay the headlap portion of the top sheet.

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1. In a composite laminated shingle unit comprising (a) a top sheet having a lower butt portion which is longitudinally divided into a plurality of spaced tabs depending from an upper undivided headlap portion having a horizontally defined nailing indicia positioned above the butt portion indicating

1. In a composite laminated shingle unit comprising (a) a top sheet having a lower butt portion which is longitudinally divided into a plurality of spaced tabs depending from an upper undivided headlap portion having a horizontally defined nailing indicia positioned above the butt portion indicating sites for attachment of the shingle unit to a substrate and (b) an elongated backer strip underlying the tabs and lower portion of the headlap which backer strip is positioned in offset or flush position along the side edges of the top sheet; the improvement which comprises a backer strip having spaced, vertically extended projections along its top margin said projections positioned in underlying contact with said nailing indicia and laminated thereto. 2. The composite shingle of claim 1 wherein said projections of said backer strip extend above the nailing indicia of the lower headlap portion. 3. The composite shingle of claim 1 wherein the backer strip completely fills the spaces between the tabs of the top sheet. 4. The composite shingle of claim 2 wherein the bottom edge of the backer is flush with the bottom edges of the tabs of said top sheet. 5. The composite shingle of claim 2 wherein the bottom edge of the backer sheet extends below the bottom edge of the tabs of said top sheet. 6. The composite shingle of claim 1 wherein the width of the backer sheet is greater than the combined height of the tabs and nail indicia and is less than ½ the width of the headlap portion. 7. The composite shingle of claim 1 wherein said nailing indicia is defined by a line of spaced markings. 8. The composite shingle of claim 1 wherein said projections of said backer strip are of uniform height. 9. The composite shingle of claim 1 wherein said projections of said backer strip are of different heights. 10. The composite shingle of claim 9 wherein said projections at the leading and trailing edges of said backer strip are higher than any intermediate projection. 11. The composite shingle of claim 1 wherein the projections of said backer strip are of uniform shape. 12. The composite shingle of claim 1 wherein the projections of said backer strip are not uniform in shape. 13. The composite shingle of claim 1 wherein the projections of the backer strip have a height of between 0.5 and about 5 inches. 14. The composite shingle of claim 1 wherein projections of the backer strip extend between about 1 and about 3 inches above the nailing indicia. 15. The method of simultaneously producing a pair of composite laminated shingle units of claim 1 from a unitary shingle membrane which comprises:(a) cutting the central portion of the shingle membrane to provide a matched pair of shingle top sheets having an outer headlap portion and an inner butt portion comprising a plurality of spaced tabs wherein the tabs of said pair are in abutment and are horizontally disposed across the membrane and each top sheet being marked in the respective headlap portions above the butt portions with a horizontal nailing area defined by spaced marking indicia;(b) simultaneously cutting the membrane along the outer horizontal free edge of each headlap portion to define a pair of matching rectangular backer strips having a width greater than said butt portions of the respective top sheets and each backer strip having spaced outwardly extending projections along its outer free margin;(c) separating the pair of top sheets and the pair of backer strips;(d) assembling a backer strip under each top sheet in a manner such that the backer strip fills the spaces between the tabs and the projections are in contact with the nailing indicia of the top sheet to provide a pair of assembled shingle units; and(e) laminating the backer strips to the top sheets of the respective assembled units to provide a pair of composite laminated shingles.