Installing Exterior Window Trim Over Aluminum Siding

The wrb is lapped over the head flashing or the flashing is taped.

Installing exterior window trim over aluminum siding.

Before you replace the siding cut and install new j channels to prevent water from leaking into your home. Install the trim so that it buts up against the tops and sides of the doors and surrounds each window frame. Typically aluminum is not used anymore to reside residential homes so the siding needed to be special ordered. This will help control water flow and prevent leakage.

On this particular job the home already had aluminum siding. After you have placed the flashing and waterproofing you will need to butt the siding up to the edges of the window. Instruction on how to install exterior 2x4 trim around a new or old window. The cement board panels are fastened to the battens.

The head flashing is installed in a bed of caulking onto the top of the window frame. Nail it at 12 inch 30 48cm increments. The rain screen battens are run down to the top of the window flange. Install the siding around the window.

Cut the horizontal piece to size and snap it in place over the vertical moldings. If the trim is being applied over the hardi panels.