Measure the outside width of the window including the frame or wood trim around it.
Styrofoam cornice board.
This measurement will depend on how far you would like your cornice board to come out from the wall i cut mine to be about 5 inches wide.
Cut 2 side pieces 5 wide each.
Measure the width of the window from the outside edges of the trim and then add 4 2 allowance per side cut front of board to desired length window trim width 4.
Deco wrap window treatment kit.
Add 1 5 inches and mark that width on the foam insulation board with a pen.
Building the cornice board.
Juvale foam board arts and crafts supplies 12 x 4 x 1 in 12 pack 4 3 out of 5 stars 138.
Now if you hang curtains under your board you need to figure for the rod.
Cut two more smaller pieces of the styrofoam panel for the sides of your cornice board.
Our foam cornices are lightweight sturdy and amazingly simple to assemble.
Our window was 35 wide.
Then hot glue the outer short edges of your long piece and press the shorter pieces to it like in the picture above.
We then had to determine how far past the window we wanted the.
Determine how long you want your boards to be.
Determine how tall you d like the.
Measure for your width.
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