Patent ID: 8763317

Claim:
A roof panel for a modular concrete building, the roof panel comprising: a first member having an outer surface, an inner surface, a medial surface, an end surface, a first side surface, and a second side surface, the first member having a first attachment portion formed on the inner surface near the end surface; a second member having an outer surface, an inner surface, a medial surface, an end surface, a first side surface, and a second side surface, the second member having a second attachment portion formed on the inner surface near the end surface; a first rib member formed on the inner surface of the first member and a second rib member formed on the inner surface of the second member, each of the rib members extending along the inner surface from the medial surface to the attachment portion; wherein the medial surface of the first member is integrally formed to the medial surface of the second member and the first member and second member are not coplanar; wherein the first rib member is integrally formed to the second rib member; a first stiffening member having a first stiffening member first portion having a first end and a second end and a first stiffening member second portion integrally formed at the second end of the first stiffening member first portion at a first angle which is greater than zero degrees and less than 180 degrees, wherein the first stiffening member first portion is partially disposed within each of the first rib member and second rib member such that the first end of the first stiffening member first portion is disposed within the first rib member and the second end of the first stiffening member first portion is disposed within the second rib member, and wherein the first angle and the first stiffening member second portion are disposed within the second rib member; and a second stiffening member having a second stiffening member first portion having a first end and a second end and a second stiffening member second portion integrally formed at the second end of the second stiffening member first portion, wherein the second stiffening member first portion is partially disposed within each of the first rib member and second rib member such that the first end of the second stiffening member first portion is disposed within the second rib member and the second end of the second stiffening member first portion is disposed within the first rib member, and wherein the second stiffening member second portion is disposed within the first rib member.