Bituminous composition

Claim 1

A SOLVENT-THINNED BITUMINOUS CEMENTING COMPOSITION ADAPTED FOR APPLICATION TO PROVIDE A WATERPROOFING LAYER IN THE CONSTRUCTION OF BUILTUP ROOFING WHICH CONSISTS ESSENTIALLY OF NON-VOLATILE CONSTITUENTS CONSTITUTING THE NON-VOLATILE BASE OF THE BITUMINOUS COMPOSITION, AND A VOLATILE SOLVENT FOR THE BITUMEN IN SAID NON-VOLATILE BASE, SAID NON-VOLATILE BASE COMPRISING ABOUT 35% TO ABOUT 45% BY WEIGHT OF BITUMEN HAVING A SOFTENING POINT OF THE RANGE 115* F. TO 135* F. AND ABOUT 55% TO ABOUT 65% BY WEIGHT OF FINELYDIVIDED SOLID WATER-INSOLUBLE FILLER HAVING A MELTING POINT ABOVE 500* F., SAID FILLER COMPRISING PLANAR-EXTENDED FILLER CONSISTING OF PARTICLES WHICH PASS A 6 MESH TESTING SIEVE AND WHICH DO NOT HAVE MORE THAN ONE DIMENSION GREATER THAN .046 INCH AND THE GRADING INDEX OF WHICH HAS A RATIO TO THE PERCENT BY WEIGHT OF THE BITUMEN IN SAID NON-VOLATILE BASE OF AT LEAST 1 TO 5, THE RATIO OF THE GRADING INDEX OF SAID PLANAREXTENDED FILLER TO THE PERCENT BY WEIGHT OF THE BITUMEN IN SAID NON-VOLATILE BASE BEING NOT GREATER THAN ABOUT 1 TO 2.5, SAID FINELY-DIVIDED SOLID WATER-INSOLUBLE FILLER COMPRISING MATERIAL PASSING A 100-MESH TESTING SIEVE WHICH IS ANY CONSTITUENT PARTICLES PASSING A 100-MESH TESTING SIEVE COMPRISED IN THE TOTAL FILLER AND WHICH CONSTITUTES IN SAID NON-VOLATILE BASE AT LEAST ABOUT 35% TO AT LEAST ABOUT 45% BY WEIGHT OF SAID NON-VOLATILE BASE PROPORTIONALLY FOR TOTAL FILLER CONTENTS RANGING FROM 55% TO 65% BY WEIGHT OF SAID NON-VOLATILE BASE, SAID FILLER COMPRISING HEAT-RESISTANT MINERAL FILLER THE RATIO OF THE PERCENT BY WEIGHT OF WHICH IN SAID NONVOLATILE BASE TO THE PERCENT BY WEIGHT OF BITUMEN IN SAID NON-VOLATILE BASE IS AT LEAST 1 TO 2, SAID NON-VOLATILE BASE HAVING A WAGNER-BOWEN PLASTICITY VALUE AT 400* F. GREATER THAN 275 GRAMS AND LESS THAN 700 GRAMS, SAID VOLATILE SOLVENT CONSTITUTING NOT GREATER THAN 20% BY WEIGHT OF SAID BITUMINOUS COMPOSITION AND HAVING FUNGACITY IN SAID COMPOSITION AT LEAST AS GREAT AS CARBON TETRACHLORIDE, AND SAID BITUMINOUS COUMPOSITION AS THINNED BY SAID SOLVENT HAVING A WAGNER-BOWEN PLASTICITY VALUE AT 77* F. BETWEEN 25 AND 75 GRAMS.