Abstract: A prefabricated composite panel is disclosed of the type comprising a rigid sheet of cellular polymeric material, a covering layer on the outer face of the foam sheet made of a cementitious material and a plurality of rigid facing elements embedded in and to the outer face of the cementitious layer so as to define an outermost surface of the panel, the facing elements being attached to the outer face in a pattern similar to conventional brickwork. Support strips formed from a rigid material different from the cellular polymeric material engage the foam sheet, the cementitious layer and a plurality of the facing elements to provide support of the facing elements to resist downward sagging of the facing elements on the foam sheet, such sagging induced by heat, combustion or other environmental factors. The cementitious layer is a fire barrier, and can be supplemented with additional fire retardant elements. A method of manufacturing such building panel is also disclosed.