Overlaid woody material and method of making the same

Claim 1

IN A COMPOSITE BOARD COMPRISING THE COMBINATION OF A BASE BOARD OF WOODY MATERIAL AND A FIBROUS, CELLULOSIC OVERLAY SHEET HAVING A COATING OF THERMOSETTING RESIN GLUE AND BONDED TO A FACE OF SAID BASE BOARD, THE IMPROVEMENT IN THE COMBINATION WHICH CONSISTS IN HAVING A HIGH MOLECULAR WEIGHT, THERMOSETTING, PHENOL-ALDEHYDE RESIN CONTAINED IN SAID SHEET IN THE AMOUNT OF FROM ABOUT 10% TO ABOUT 100% OF RESIN SOLIDS BY WEIGHT, BASED ON THE DRY WEIGHT OF THE FIBERS IN SAID SHEET, THE ENTIRE AMOUNT OF THE CONTAINED HAVING BEEN ADDED TO AN AQUEOUS FIBROUS SLURRY FOR THE SHEET, UNIFORMLY DISTRIBUTED THEREIN, PRECIPITATED ON THE FIBERS WITH AN ACIDIC AGENT, AND ONLY PARTLY CURED IN THE MAKING OF THE SHEET BUT SUBSTANTIALLY FULLY CURED DURING THE BONDING OF THE SHEET TO THE BASE BOARD, THE SHEET BEING INTIMATELY AND PERMANENTLY BONDED TO THE BASE BOARD, AND THE RESULTING OVERLAID FACE OF THE COMPOSITE BOARD BEING CHARACTERIZED BY A DURABLE, SMOOTHLY FINISHED, WEATHER-RESISTANT, AND LOW PAINT DEMAND SURFACE.