Built-up roof

Claim 1

A BUILT-UP ROOF COMPRISING A ROOF DECK, A CONTINUOUS FILM OF WATER VAPOR IMPERVIOUS MATERIAL SUPERIMPOSED ON SAID ROOF DECK, A LAYER OF THERMAL INSULATION COMPRISING JUXTAPOSED RIGID POROUS LAMINATED INSULATION BOARDS IN SAID VAPOR IMPERVIOUS FILM, EACH LAMINATED BOARD COMPRISING TWO BONDED PILES OF CELLULOSE FIBER INSULATION BOARD, A PLURALITY OF SPACED CONTINUOUS BANDS OF ADHESIVE MATERIAL EXTENDING LENGTHWISE BETWEEN AND BONDING THE PLIES TOGETHER WITH THE BANDS SEPARATING THE PLIES TO FORM MOISTURE-AIR CONVEYING CHANNELS BETWEEN THE SPACED BANDS, EACH MOISTURE-AIR CONVEYING CHANNEL HAVING HEIGHT OF ABOUT 0.03-0.006 INCH AS INSTALLED, SAID ADHESIVE MATERIAL OF THE BANDS BEING SELECTED FROM THE GROUP CONSISTING OF SOYBEAN PROTEIN AND PEARL STARCH ADHESIVES AND CONTAINING FROM ABOUT 50%-80% OF WATER WHEN THE PLIES ARE BONDED WHEREBY THE WATER CONTENT OF THE LAMINATED BOARDS IS MATERIALLY INCREASED BY ABSORPTION, SAID CHANNELS COMMUNICATING WITH SIMILAR MOISTURE-AIR CONVEYING CHANNELS IN ADJOINING LAMINATED INSULATING BOARDS FOR PERMITTING THE MOISTURE TO ESCAPE FROM THE LAMINATED BOARDS DURING INSTALLATION AND SUBSEQUENT EXPOSURE THEREOF ON THE ROOF DECK WITHOUT SUBSTANTIAL WARPING OF SAID BOARDS AND ALSO AIR PRESSURES FROM SAID BOARDS, AND SUPERPOSED ALTERNATE LAYERS OF ADHESIVE BITUMINOUS MATERIAL AND BITUMINOUS MATERIAL-SATURATED FELT OVERYING THE THERMAL INSULATION LAYER, THE LOWERMOST FELT LAYER BEING BONDED TO THE OUTER SURFACE OF THE INSULATION LAYER AND THE FELT LAYERS BEING BONDED TO ONE ANOTHER BY THE ADHESIVE BITUMINOUS MATERIAL.