Nail it to the wall but remember not to nail it tightly.
How to install vinyl siding j channel around window.
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.
In from each end and deeply score the inner cutting line with a utility knife.
For the window first position the j channel against the window casing.
Cut a section of new j channel 2 in.
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.
Mark out a notch 1 in.