Hot mopped asphalt roofing systems incorporating polyisocyanurate coverboards

A roofing coverboard, comprising:

• a foam core having a first surface and a second surface opposite the first surface;
• a first patterned facer coupled to the first surface of the foam core, wherein the first patterned facer is characterized by an aperture density of greater than or about 100 first apertures per square foot;
• and
• a second patterned facer coupled with the second surface of the foam core, wherein the second patterned facer is characterized by an aperture density of greater than or about 100 second apertures per square foot.

A roofing method, comprising:

• applying a first layer of asphalt-containing adhesive to a roofing substrate;
• applying a polyisocyanurate coverboard over the second layer of asphalt-containing adhesive, the polyisocyanurate coverboard comprising:
• a first patterned facer coupled with a first surface of a polyisocyanurate core;
• and
• a second patterned facer coupled with a second surface of the polyisocyanurate core opposite the first surface of the polyisocyanurate core;
• applying a second layer of asphalt-containing adhesive to the polyisocyanurate coverboard;
• and
• applying a roofing membrane over the second layer of asphalt-containing adhesive.