Dress up plain windows or hide unsightly shade or curtain hardware with an upholstered cornice box.
Staple one side of the batting on the interior corner using a staple gun and 5/8” staples. Leave approximately six inches of excess batting on the other side and cut off the excess. Pull tightly ensuring that there are no wrinkles on the face of the cornice then staple on the interior edge of the cornice box.
Finish the edges by folding the batting with a straight vertical seam in the corners. Wrap and staple tightly on the inside of the cornice.
Spray the batting with adhesive. Wrap and staple one side of the fabric on the interior corner of the cornice.
Wrap the other side, and pull tightly to ensure that the fabric is straight and has no wrinkles on the front side. Staple securely along the same interior edge. Allow the excess to wrap over the back edge.
Staple excess fabric along the back edge of the cornice. This edge will be against the wall, so it will not be visible. Cut off the excess fabric.
Finish the fabric on the corners by folding it into a hospital corner. Wrap and staple on the interior of the cornice
Determine the exact placement of the cornice on the window. Level and mark the holes to install a heavy-duty L bracket on the top right-side of the window frame. Pre-drill holes using a 1/4” drill bit.
Use 2” wood screws to attach the L bracket to the window frame.
Place a large level on the L bracket you just installed and hold up the other bracket on the opposite side of the window until both are level with each other. Use a pencil to mark for the second bracket's placement. Pre-drill and use 2” screws to adhere the second L bracket.