For handrails at one or more edges of the roof snap the lines 1 1 2 inch in from the edge of the roof.
													
																	How to build a railing on a roof. 
									
	
		
	
																	3 determine the spacing of the posts by measuring the sections off manufactured metal railing. 
																	Usually the decks rails are 36 including the top trims 3 4. 
																	The first step of the project is to build the wooden posts. 
																	Railings for roof decks provide safety and complement the design of a deck. 
															
													
									
	
		
	
																	With wooden or hot application decks attachment of the handrail posts and the ends of the railing provides the. 
																	Should older railings be found deficient a design professional should review codes in effect at the time of construction as well as capacity and condition of existing materials to determine whether original railings. 
																	Sometimes a building owner discovers that an unprotected area should have railings or that a roof replacement or other alteration has rendered an existing system inadequate.