The ledger typically a 2 by 6 is usually designed to hold one end of the patio roof rafters.
													
																	How to attach gable porch roof to house. 
									
	
		
	
																	How to tie a additions roof to existing roof roof additions to existing roofs how to construct a roof from an exsisting shead how to change a roof line how to attach a deck roof to existing roof how to add a roof over porch attache porch roof on house attach shed roof to house adding a roof to screened in porch adding a roof to existing. 
																	That usually is done with a header or ledger board secured to the house. 
																	Step 1 position the porch truss. 
																	If you decide on a shallow pitch porch roof use 2 by 6 foot rafters. 
															
													
									
	
		
	
																	Position and secure the gable porch truss flat against the top plate of the porch s end. 
																	The complexity of the job will vary with the size of roof from a simple entryway covering to one over a large screened in area. 
																	A house attached patio roof takes advantage of the house s structure by supporting one end of the roof on a ledger mounted horizontally to the house. 
																	Start nailing the ridge board to the gable roof. 
															
													
									
	
		
	
																	Extend a cord or line on the level from the truss s peak to the roof line s highest peak. 
																	The positioning of your rafters will depend on the pitch of the porch roof. 
																	A common element in adding porch roofs is fastening one end to the house either to a wall or to a roof. 
																	The porch roof may match the pitch of your home or have a more shallow roof pitch. 
															
													
									
	
		
	
																	Use screws to secure the rafter to the sill plate.