The risers need to be taller than the profile of the material you re cutting.
													
																	How to make a jig for cutting vinyl siding. 
									
	
		
	
																	This piece is the handle. 
																	Run the saw through once to create a kerf in the channel. 
																	Cut 1 by 2 lumber to 3 inches long. 
																	Homemade vinyl siding and soffit cutting jig constructed from lumber and steel. 
															
													
									
	
		
	
																	Attach the riser boards to a large piece of plywood. 
																	Put a piece of 1x1 on one of the 1x4s to act as a saw guide. 
																	Place the narrow edge against the middle of the jig so it runs from side to side on the same side as the 1 by 3 piece that overlaps the jig end. 
																	Intended for utilization with a circular saw. 
															
													
									
	
		
	
																	Accommodates full length sidings and soffits.