How To Case A Window Interior

When you re done you ll have a beautifully accented window to show for your efforts.

How to case a window interior. Step 3 check the fit then cut to length. Miter the top window casing on each end at a 45 angle so the short mitered edge is 1 4 longer than the width of the window opening to allow for the 1 8 reveals on each side of the opening. Cut the 1 4 mdf to size.

I show you how i build a cased unit to install on a window above a stairwell. You will notice the layers on the edge do not cover the inside layer because this layer will be exposed once the window is complete. Because you will be installing an interior window casing i would recommend using a 16 or 15 gauge nail gun to make sure the board will stay in place.

Follow up with 2 3 coats of interior acrylic paint letting each coat dry to the touch before applying the next until you reach the desired coverage and depth of color. If you want to save time later sand the boards with 220 grit sandpaper. Away from the jamb at both ends and along the base of the window casing.

Hold a length of casing across the top of the window and mark where it meets the inside edge of each side casing. Brush on a single coat of primer and allow it to dry overnight. Glue the head casing to the head jamb making sure its bottom edge lines up with the reveal line.

Take into consideration the width of the window casing and trim on each side and add an inch for the stool to extend beyond the trim. Next add a thin line of wood glue to the edge of the 1 2 plywood. You can use a jigsaw coping saw or hand saw to cut out the edges of the stool so it fits snug against the window and has a reveal over the sides of the window.

Step 7 add corner blocks. Using an orbital sander to do this will also save time. Brads spaced about every 6 in.