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Re-roof with Class A or B roof covering material weighing less than 6 pounds per sq. ft. overexisting solid sheathing (190 ) Squares. Class A roof covering is required within Very High FireHazard Severity Zone (VHFHSZ). For residential roof replacement > 50% of the total roofarea, apply Cool Roof Product labeled and certified by Cool Roofing Rating Council (CRRC).Cool Roof may be required for non-residential buildings per Title 24, Part 6, Section141.0(b)2B.