Begin by installing the first row of siding on both sides of the deck.
Install window trim before or after siding.
If we installed the trim after the siding we would have had to caulk a ton to fill in for the different levels the layered siding creates.
The head flashing is installed in a bed of caulking onto the top of the window frame.
As long as the old siding isn t bulging or falling off you can usually install vinyl siding right over it.
To provide a common reference point measure up 8 in.
This increases the exterior wall thickness however so you ll need to extend the window.
The wrb is lapped over the head flashing or the flashing is taped.
If the trim is being applied over the hardi panels.
Also if the windows are of different sizes it gives the contractor a chance to make some custom changes so the window will fit properly.
Nevertheless you can install the siding first if you have already started on that.
The rain screen battens are run down to the top of the window flange.
Before you replace the siding cut and install new j channels to prevent water from leaking into your home.
Instruction on how to install exterior 2x4 trim around a new or old window.
Sfgate has a web page for how to install them yourself but it is very informational on the installation of windows before siding and why you should go in that order.
Cut the horizontal piece to size and snap it in place over the vertical moldings.