Process for in-line extrusion coatings onto roofing shingles during manufacturing and roofing shingles made by the process

A roofing shingle, comprising:

• a substrate having a first surface and a second surface, the first surface including a headlap portion and an exposed portion;
• a waterproof layer positioned along the first surface of the substrate;
• a plurality of granules applied to the headlap portion and the exposed portion;
• and
• a polymeric film positioned along the second surface of the substrate;
• wherein the polymeric film comprises a thickness of 5 microns to 150 microns.

A stack of roofing shingles, comprising:

• a plurality of roofing shingles, at least some of the roofing shingles comprising;
• a substrate including a first surface having a headlap portion and an exposed portion, and a second surface;
• a protective layer comprising a plurality of granules applied to the first surface of the substrate;
• and
• a polymeric film applied to the second surface of the substrate, the polymeric film having a thickness of 5 microns to 150 microns;
• wherein the polymeric film is configured to deter sticking between adjacent roofing shingles of the stack of roofing shingles without application of a dusting material along the second surface.

A roofing shingle, comprising:

• a substrate having a first surface and a second surface, the first surface including a headlap portion and an exposed portion;
• a protective layer positioned along the first surface of the substrate, the protective layer comprising a plurality of granules;
• and
• a polymeric film applied as an extruded polymeric material along the second surface of the substrate and having a thickness configured to form a moisture barrier adapted to substantially to seal the second surface of the substrate against penetration of moisture therethrough;
• wherein the polymeric film is configured to deter sticking between the roofing shingle and an adjacent roofing shingle when the roofing shingle and the adjacent roofing shingle are arranged in a stack of roofing shingles without application of a dusting material along the second surface.