Installing Exterior Window Trim Over Aluminum Siding

Instruction on how to install exterior 2x4 trim around a new or old window.

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. Nail it at 12 inch 30 48cm increments. After you have placed the flashing and waterproofing you will need to butt the siding up to the edges of the window. Cut the horizontal piece to size and snap it in place over the vertical moldings.

The cement board panels are fastened to the battens. If the trim is being applied over the hardi panels. When installing the trim at the windows start at the bottom then move to the sides and install the top portion last. The client had a tight budget and just wanted to patch in new siding to match the existing siding.

Typically aluminum is not used anymore to reside residential homes so the siding needed to be special ordered. If possible you can simply remount the. On this particular job the home already had 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. Install the siding around the window.