An insulation system includes a panel having a major surface, a layer of fibrous insulating material and at least one securing clip affixed to the panel and securing the insulation layer to the major surface. The method envisages reducing the electrical stress to which the reference memory cell is subjected during reading, by generating and holding a sample of the reference voltage, then deselecting the reference memory cell, and then continuing reading using the sample of the reference voltage. The consolidation may be achieved by hot pressing, HIP or any other appropriate method.