Begin by cutting the 1 x 4 board to the width measurement determined in step 1.
Window cornice height.
The height of the cornice is generally 1 5 the total height measurement of the window or the current treatment.
Take down the cornice and extend the mark with a 4 ft.
A window cornice is typically solid like these made from wood in this tutorial while a window valance is.
Center the cornice over the opening at the height that best covers the curtain rod and curtain.
Then reach underneath and mark the bottom.
A window cornice is a 3 sided box that frames the top of a window.
On a window that measures 60 inches from the top to the bottom a 10 to 16 inch long cornice box is in good proportion.
However if you want to make the window look taller the box s length must.