Roofing systems and methods

Abstract

A roofing system includes a plurality of insulation boards adapted for overlying a roof deck to form a layer of insulation, and a plurality of cover boards adapted for overlying the layer of insulation. Each of the plurality of insulation boards has opposing planar surfaces and has a facer on at least one planar surface, and each of the plurality of insulation boards includes polyisocyanurate foam having a first polyisocyanurate foam density. Each of the plurality of cover boards has opposing planar surfaces and has a facer on at least one planar surface, and each of the plurality of cover boards includes polyisocyanurate foam having a second polyisocyanurate foam density greater than the first polyisocyanurate foam density. Each of the plurality of cover boards also includes 1% to 25% by weight one or more fillers selected from the group consisting of organic fillers and inorganic fillers

Dependencies are inferred from the claim text.