How to build a lean to shed roof step 1.
													
																	How to build a lean to shed roof. 
									
	
		
	
																	To attach a wooden nailer to a metal sided building use a self drilling screw with sufficient threads to hold the nailer tightly. 
																	Dig out the first hole set in the block and check the elevation of the floor using a 2 6. 
																	Connect the ends. 
																	Make sure the block is deep enough to give the desired finished floor height. 
															
													
									
	
		
	
																	Make a ledger board to fasten to the existing wall and support the upper end of the lean to roof. 
																	Construct the roof supports 1 fasten the nailer to the side of your existing building where you will attach the upper end of your rafters. 
																	Start with a corner block.