Installing Exterior Window Trim Over Aluminum Siding

The rain screen battens are run down to the top of the window flange.

Installing exterior window trim over aluminum siding.

Install the trim so that it buts up against the tops and sides of the doors and surrounds each window frame. If the trim is being applied over the hardi panels. This will help control water flow and prevent leakage. Nail it at 12 inch 30 48cm increments.

Install the siding around the window. The client had a tight budget and just wanted to patch in new siding to match the existing siding. Instruction on how to install exterior 2x4 trim around a new or old window. Typically aluminum is not used anymore to reside residential homes so the siding needed to be special ordered.

The head flashing is installed in a bed of caulking onto the top of the window frame. Cut the horizontal piece to size and snap it in place over the vertical moldings. If possible you can simply remount the. The wrb is lapped over the head flashing or the flashing is taped.

On this particular job the home already had aluminum siding. Before you replace the siding cut and install new j channels to prevent water from leaking into your home.