I used an exacto.
Diy window cornice foam board.
Add 1 5 inches and mark that.
To cover the boards cut a piece of batting fabric 10 wider and 10 longer than your foam box including the returns.
Set a straightedge across the foam board at the desired valance height.
In this way cornices provide a more structured window treatment option than valences do while also creating interest through the fabric that you use.
How to make a cornice board valance from foam insulation 1.
Cut out the length and width of foam board.
Determine the height of the cornice and cut the foam board accordingly.
First you need to measure the width of your window and decide how deep you need to make your cornice board and how tall you want it.
Cut a piece of foam board to the width of the window plus 6 inches.
For my kitchen window i needed a 46 width.
Measure the length of your window and add a foot to that.
This is the length your cornice will be including the side.
Instead a cornice is an upholstered board that is attached to the wall above your window.
Score the board with a utility knife.
Starting in the middle wrap the batting fabric toward the back as tight as possible and secure in place with nails.
On the other hand a cornice is a hard treatment.
This cornice is 11 inches high.
There is no hanging fabric.
Following the directions of the foam core board tutorials i built my cornices from my foam panels.
Measure the outside width of the window including the frame or wood trim around it.
Add 3 inches to each side of the measurement 6 inches total.
Make the corners of your cornice by.