Composite board

Claim 1

A COMPOSITE SUBSTANTIALLY RIGID AND DIMENSIONALLY STABLE PANEL STRUCTURE COMPRISING IN COMBINATION AN INTEGRAL INTERNAL FIBER BOARD ASSEMBLY CONSISTING OF A PLURALITY OF LAMINAC OF BOARD FILLER ELEMENTS WITH A LAYER OF WATER INSOLUBLE ADHESIVE BETWEEN ADJACENT LAMINAE, EACH OF SAID LAMINEA HAVING INCORPORATED THEREIN A WATER REPELLENT MATERIAL TO RENDER SAID LAMINAE SUBSTANTIALLY WATER IMPERVIOUS AND SAID WATER IMPERVIOUS LAMINAE BEING JOINED INTO SAID INTEGRAL FIBER BOARD ASSEMBLY BY SAID WATER INSOLUBLE ADHESIVE LAYER BETWEEN SAID LAMINAE, AND A WATER, WATER VAPOR PROOF AND RELATIVELY HIGH HEAT RESISTANT CONTINUOUS BARRIER FILM OF RESINOUS MATERIAL ADHERED TO AND IN DIRECT CONTACT WITH EACH OF THE OUTER SURFACES OF SAID FIBER BOARD ASSEMBLY AND SUBSTANTIALLY UNIFORMLY DISTRIBUTED OVER SAID SURFACES TO EFFECTIVELY PREVENT DIFFUSION OF WATER AND WATER VAPOR INTO SAID FIBER BOARD ASSEMBLY, SAID BARRIER FILM COMPOSED OF POLYETHYLENE FILM FORMING MATERIAL, SAID WATER REPELLENT MATERIAL SUBSTANTIALLY PROHIBITING PENETRATIOIN OF FILM BARRIER FILM INTO THE FIBER STRUCTURE OF SAID BOARD FILLER ELEMENTS, SAID PANEL STRUCTURE BY REASON OF SAID WATER REPELLENT MATERIAL, SAID WATER INSOLUBLE ADHESIVE AND SAID BARRIER FILM HAVING LOW MOISTURE VAPOR, WATER TRANSMISSION, SORPTION AND RELATIVELY HIGH TEMPERATURE HEAT RESISTANT CHARACTERISTICS WHEREBY SAID COMPOSITE PANEL STRUCTURE IS RENDERED STABLE AGAINST WARPING AND DIMENSIONAL CHANGE FROM EXPOSURE TO WATER, CONDITIONS OF HIGH RELATIVE HUMIDITY AND CONDITIONS OF RELATIVELY HIGH TEMPERATURE HEAT TREATMENT.