A laminated structural insulated panel has an inner or core layer, an outer layer on the opposite facing surfaces of the core layer and an adhesive layer between each surface of the core layer and its respective outer laminate layer. To increase the strength and reduce the likelihood of delamination, the present panel is provided with a plurality of perforations in the surface of the core layer that receives the outer and adhesive layers. Each of the perforations form a chamber that receives a portion of the bonding agent or adhesive utilized for the adhesive layer. The bonding agent or adhesive bonds to the side walls of the chamber to mechanically anchor the outer layer to the interior of the core layer by substantially increasing the bonding surface between the adhesive layer and the core layer. In one embodiment, the core layer is an expanded polystyrene or other rigid foam.