Patent ID: 8359794

Claim:
A system covering a substrate, comprising a plurality of elongated board members attached to extend outward from the substrate, wherein each of the elongated board members includes a central portion with an outer surface and an inner surface, a first edge portion extending along a first side of the elongated board member and a second edge portion extending along a second side of the elongated board member, opposite the first side, the central portion is disposed between the first and second edge portions, each of the elongated board members is attached to the substrate along the first edge portion and along the second edge portion, each of the elongated board members is configured before attachment to the substrate so that a contact surface forming part of the inner surface and held against the substrate, is convex, being entirely disposed along a single convex curve extending between the first and second edge portions, with a central portion of the contact surface, extending along the elongated board member mid-way between the first and second edge portions, being disposed substantially farther inward than edges of the contact surface extending along the first and second edge portions.