The plan was 2 9 doors but she changed her mind in favor of a 20.
													
																	Header needed for 18 garage door. 
								
	
		
	
																	It is important to note. 
																	16 garage door headers mtlogcabin a minimum 3 x 11 25 net header size is required for opening from 6ft to a maximum 18 ft. 
																	That would take care of the wind and seismic shear loads. 
																	20 header over garage door. 
															
													
								
	
		
	
																	Width meaning your header should be 16 feet 9 inches long. 
																	For single car garages include 8 x 7 ft 8 8 ft 8 9 ft 9 8 ft 10 7 ft and 10 8 ft. 
																	The extra length for the header is to. 
																	Window door garage door headers supporting roof wall floor loads. 
															
													
								
	
		
	
																	Only that the minimum net header size shall be 3 x ll 25. 
																	Measure the width of your door frame. 
																	On previous projects i have been supplied a glu lam boise makes specifically for garage door headers that was 3 1 2 x 11 1 4 x 18 9. 
																	For double doors garage the standard. 
															
													
								
	
		
	
																	Download a pdf tables 15 20. 
																	The procedure for constructing a header for 6 inch exterior wall framing can be modified for any wall thickness. 
																	When in doubt use 2 by 12 inch headers. 
																	Building a structural header for a garage door opening can be handled on the jobsite and will offer the same structural support as more expensive solid wood beams. 
															
													
								
	
		
	
																	The beam they have specified now is 3 1 2 x 12 x 18 9. 
																	All all all all all all. 
																	Window door garage door headers supporting roof loads only. 
																	The person doing the takeoff had interpreted my request for an 18 9 garage door header to the least expensive 20 long beam. 
															
													
								
	
		
	
																	Usually 18 ft door used to accommodate two vehicles in the garage. 
																	There are a few sizes of doors that are considered standard. 
																	The 16 7 opening should be after the header and all the trim work is installed. 
																	Between 4 and 5 feet the header should be built 2 inches wide and 8 inches long while a larger opening needs a header that is 2 by 12. 
															
													
								
	
		
	
																	Most door frames that are 4 feet wide or less require a 2 by 6 header. 
																	1 15 1 15 1 15 1 15 1 25 1 25. 
																	30 40 50 70 20 20. 
																	Correct does not state that header 6 to 18 can be dimensional lumber. 
															
													
								
	
		
	
																	Im not getting an engineer involved b c this is a budget build for my wifes aunt. 
																	That for a 16 foot wide garage door the header should be at minimum 9 inches longer than the door.