Step 1 measure the damaged rafter.
													
																	How to repair a cracked roof rafter. 
									
	
		
	
																	This article describes a diy repair project using a site built spreader to straighten sagged roof rafters and decking. 
																	A rafter might split when heavier roof tiles are. 
																	When considering what to do about sags in a roof start by noticing if the sag is in sheathing between rafters page top photo0 or sagging along the length of the rafters. 
																	Rafters can also be damaged by a blow to the roof from falling branches. 
															
													
									
	
		
	
																	Repairing this is called scabbing. 
																	Overview from time to time an attic rafter will split along a knot typically after having a new roof installed because of the workers walking around on it. 
																	Obviously this is not a good situation as it can cause the entire roof to fail if not addressed. 
																	Fixing a cracked or split rafter in your attic ensures that the roof will receive the necessary support. 
															
													
									
	
		
	
																	A cracked roof rafter can create a sagging and unsightly roof. 
																	An l channel that is 1 by 1 and at least 2 feet long should be. 
																	Roof rafter decking sagging. 
																	This board is a section of lumber that is the same thickness as the rafter and 2 feet longer on each side of the damaged section. 
															
													
									
	
		
	
																	The important aspects of this repair is the length of the split as you will need to adequately cover it. 
																	A cracked roof rafter needs to be repaired and can be done byf an experienced do it yourselfer.