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