The J-mouldings line the windows and prevent water from seeping in behind the vinyl facing.
5.1. Measure the outline of the first window.
5.2. Using metal snips, cut the moulding 2″ longer than the length of the bottom of the window.
5.3. Cut a 1″ notch on each side of the nailing flange, on the part that rests on the window sill, leaving the front intact.
5.4. Nail the moulding under each overhang, with an extra 1″ on each side.
5.5. Use metal snips to cut two lengths of J-trim, 2″ longer than the sides of the window.
Nail to secure.
5.6. Cut the J-trim for the upper part of the window, 2″ longer than the sides of the window.
At each end, cut a 1″ notch in both corners at the bottom of the J-trim and fold back the strip at a right angle.
5.7. Make a 45° mitre cut towards the roof line in the part before the J-trim. Nail to secure.
5.8. Fit the upper moulding strips into the notches of the two lateral mouldings to make a rain water run-off.
5.9. Apply silicone-based caulk to the perimeter of the exterior frame as well as on nail heads.
5.10. Install vinyl siding.