Patent ID: 8215083

Claim:
A method, comprising: (a) providing a previously formed unitary building exterior envelope product comprising: a mineral fiber insulation board which comprises a binder having a hydrophobic agent, said mineral fiber insulation board being water-repellant and having first and second major surfaces, an exterior facing material, which is an air and rain barrier, laminated to the first major surface of the insulation board, the exterior facing material being permeable to water vapor, and a water repellant interior facing laminated to the second major surface of the insulation board, and which is permeable to water vapor; (b) mounting the unitary building exterior envelope product to an exterior side of a plurality of framing members of an exterior wall of a building, so that the interior facing faces the framing members; and (c) mounting an exterior layer to the framing members using a connection device that passes through the section of building envelope product, with the exterior facing material facing the exterior layer, thereby to form the exterior wall.