| CPC E04D 13/1693 (2013.01) [E04D 5/00 (2013.01)] | 11 Claims |

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1. A roofing system comprising:
a roof deck;
a plurality of tapered insulation panels applied onto the roof deck, with each tapered insulation panel of the plurality of tapered insulation panels having an upper surface, a lower surface, a first side surface that extends from the upper surface to the lower surface, and a second side surface that is opposite to the first side surface and extends from the upper surface to the lower surface, wherein each tapered insulation panel of the plurality of tapered insulation panels comprises an individually formed, tapered polyisocyanurate foam panel that extends uniformly from (i) the upper surface to the lower surface and (ii) the first side surface to the second side surface;
at least one non-tapered insulation panel applied onto the upper surface of each tapered insulation panel of the plurality of tapered insulation panels, with the at least one non-tapered insulation panel having an upper surface and a lower surface, with the lower surface of the at least one non-tapered insulation panel being applied onto the upper surface of each tapered insulation panel of the plurality of tapered insulation panels, wherein the at least one non-tapered insulation panel comprises a non-tapered polyisocyanurate foam panel; and
a membrane layer applied onto the upper surface of the at least one non-tapered insulation panel, with the membrane layer having an upper surface and a lower surface, with the lower surface of the membrane layer being applied onto the upper surface of the at least one non-tapered insulation panel, wherein the membrane layer comprises at least one of (i) a single-ply TPO membrane, (ii) a single-ply PVC membrane, (iii) an ethylene propylene diene terpolymer membrane (EPDM), (iv) a modified bitumen roofing layer, or (v) a built-up roofing (BUR) layer,
wherein the roofing system is applied in accordance with instructions for installation, such that (i) the plurality of tapered insulation panels are applied onto the roof deck, (ii) the at least one non-tapered insulation panel is applied onto the upper surface of each tapered insulation panel of the plurality of tapered insulation panels, and (iii) the membrane layer is applied onto the upper surface of the at least one non-tapered insulation panel, such that the upper surface of the membrane layer is exposed.
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