An asphalt-based roofing material includes a coating having a top portion
containing a mixture of asphalt and igneous and/or metamorphic rock
particles, while the mat portion of the coating contains a mixture of
asphalt and a filler which contains less than 10% igneous and/or
metamorphic rock particles. In other embodiments, the top portion but not
the bottom portion of the coating meets or exceeds a pliability standard,
passes a weathering performance test, or has a high solar reflectance. In
another embodiment relating to a laminated roofing material, the top
portion but not the bottom portion has viscoelastic properties effective
to prevent the coating from sticking to an adjacent shingle in a bundle.
The invention also relates to a continuous process of applying first and
second coatings to a mat for manufacturing a roofing material. In a first
coating operation, a first asphalt-based coating is continuously applied
to a first surface of the mat so that the first coating saturates the mat
and forms a layer on the first surface. In a second coating operation, a
second asphalt-based coating is continuously applied to a second surface
of the mat so that the second coating forms a layer on the second
surface. The second coating has different properties from the first
coating.