Re-roof with course a or b roof covering material weighing a lot less than six lbs . for each sq. ft. above existing stable sheathing 20 squares. class a roof covering is necessary in really large fire hazard severity zone (vhfhsz). Re-roof with class a or b roof covering https://httppronailcomplexx-uscom47924.wikiinside.com/1836807/the_best_side_of_commercial_roofing_services