For other applications builders and roofers must use d226 type ii roofing felt or a synthetic felt that has met florida building code approval.
													
																	Roofing felt requirments in florida. 
								
	
		
	
																	Florida s code with its emphasis on minimizing hurricane damage influences the development of codes in other states. 
																	Asphalt saturated felt starting at the eaves and lapping upper courses over lower by a minimum of 2 inches. 
																	Asphalt saturated felt starting at the eaves and lapping upper courses over lower by a minimum of 2 inches. 
																	On roofs with a slope of 4 12 or greater use a single layer of 15 lb. 
															
													
								
	
		
	
																	On roofs with a slope of 4 12 or greater use a single layer of 15 lb. 
																	Starting at the eave apply 36 inchwide 914 mm sheets of underlayment overlapping successive sheets 19 inches 483 mm end laps shall be 6 inches and shall be offset by 6 feet.