Install the top piece of molding snapping it over the vertical side moldings.
													
																	How to install vinyl siding window trim. 
									
	
		
	
																	Available in a variety of colors and styles vinyl siding is widely used and favored by many contractors and do it yourselfers for its durability. 
																	Slide each siding piece into the j channel and secure to house with roofing nails. 
																	Install the tops first then the sides and then the bottoms of the window surrounds. 
																	Install siding at the top of a window or door in a similar fashion but this time set the siding on the window channel and use the window trim to mark the cut. 
															
													
									
	
		
	
																	Instruction on how to install exterior 2x4 trim around a new or old window. 
																	Take the vinyl siding pieces removed earlier and cut them down to fit around the window. 
																	Along the tops install j channel trim with horizontal siding and base trim with vertical siding. 
																	Installing vinyl siding around windows. 
															
													
									
	
		
	
																	Install door window trim.