Nail it at 12 inch 30 48cm increments.
Installing exterior window trim over aluminum siding.
The wrb is lapped over the head flashing or the flashing is taped.
The head flashing is installed in a bed of caulking onto the top of the window frame.
Typically aluminum is not used anymore to reside residential homes so the siding needed to be special ordered.
On this particular job the home already had aluminum siding.
The rain screen battens are run down to the top of the window flange.
When installing the trim at the windows start at the bottom then move to the sides and install the top portion last.
Install the trim so that it buts up against the tops and sides of the doors and surrounds each window frame.
The cement board panels are fastened to the battens.
Cut the horizontal piece to size and snap it in place over the vertical moldings.
Install the siding around the window.
Before you replace the siding cut and install new j channels to prevent water from leaking into your home.
This will help control water flow and prevent leakage.
If the trim is being applied over the hardi panels.
If possible you can simply remount the.