A product comprises: a mineral fiber insulation board which is resistant to liquid water-penetration and has first and second major surfaces, a facing material, which is resistant to air infiltration and liquid water-penetration, laminated to the first major surface of the insulation board, the facing material being permeable to water vapor, and an interior facing laminated to the second surface of the insulation board with an adhesive, so that the second major surface with the interior facing and adhesive thereon is resistant to liquid water-penetration, thereby to form a unitary building exterior envelope product.