Mark cut and notch the top.
How to install vinyl siding j channel around window.
For the window first position the j channel against the window casing.
Continue installing courses of siding along the sides of the window leaving 1 4 inch spaces within the j channel at the end of each piece of the siding for expansion.
You have to wrap the window with vinyl j channel to divert water and to cover the ends of the siding photo 9 you ll probably have to buy new strips for this.
Cut a section of new j channel 2 in.
Install the j channel vinyl siding around all four sides of a window or three sides of a door.
Nail it to the wall but remember not to nail it tightly.