Coated roofing

Claim 1

A ROOFING HAVING HIGH RESISTANCE TO FIRE, COMPRISING SHEET-LIKE BASE MATERIAL AND CARRIED BY SAID SHEET-LIKE BASE MATERIAL A LAYER OF THERMOPLASTIC BITUMINOUS COMPOSITION, SAID BITUMINOUS COMPOSITION CONTAINING WATERPROOFING BITUMEN HAVING A SOFTENING POINT ABOVE 80* F. AND NOT ABOVE 275* F, AND OF THE RANGE 20% TO 65% BY WEIGHT OF SAID COMPOSITION, AND SAID COMPOSITION CONTAINING INTIMATELY COMMINGLED AND DISTRIBUTED UNIFORMILY THROUGHOUT FINELY-DIVIDED SOLID WATER-INSOLUBLE FILLER OF THE RANGE 35% TO 80% BY WEIGHT OF SAOD COMPOSITION AND HAVING A SOFENTING POINT ABOVE 500* F., SAID FILLER CONSISTING OF A MIXTURE OF ORGANIC FILLER AND HEAT-RESISTING MINERAL FILLER, AND SAID FILLER HAVING A FLOW RESISTANCE COEFFICIENT OF AT LEAST 75 WHEN SAID COMPOSITION CARRIED BY SAID SHEET-LIKE BASE MATERIAL IS EXPOSED TO FLAME TEMPERATURE UNDER THE FLOW RESISTANCE TEST DEFINED HEREIN, SAID HEATRESISTANT MINERAL FILLER WITHOUT SAID ORGANIC FILLER HAVING A FLOW RESISTANCE COEFFICIENT LESS THAN 75, SAID BITUMINOUS COMPOSITION HAVING A WAGNERBOWEN PLASTICITY VALUE AT 400* F. NOT SUBSTANTIALLY GREATER THAN 1500 GRAMS, AND SAID BITUMINOUS COMPOSTION PROVIDING A PLIABLE WEATHER RESISTANT LAYER OF THE HOT-SPREAD COATING TYPE INTEGRALLY BONDED WITH SAID SHEET-LIKE BASE MATERIAL.