Easy Cornice Tutorial Using Foam Board

By The Style Sisters - Sunday, November 30, 2014

Easy cornice tutorial using foam board


- Foam insulation board from your local hardware store 3/4" thick to 1" thick

- duct tape (we used silver to match the back of the foam insulation)

- a curtain rod

- hot glue

- straight pins

- fabric

- quilting batting


Measure your window with a 3-4 inch overhang on each side. Then determine the height from top of cornice to bottom as you desire. The cornices in the kids rooms were about 2 feet in height and the cornice in the basement room reveal was only 1 foot in height. If you have a blind in the window you probably want to make it a little larger to cover the hardware. Also, the higher you hang the cornice the larger the room feels.

Foam board cornice tutorial
Next use your measurements to cut the foam insulation to your measurements. We used a box cutter with short sawing motions. And get ready for lots of little foam beads.
Next cut the side pieces. Place the foam board you just cut on a flat surface and put your curtain rod on top with the brackets facing up. Next grab a remnant piece of foam board and place perpendicular on the short side. Make a mark just below the edge of the curtain rod edge. Cut off the excess.

Easy cornice tutorial using foam board
Grab your duct tape and (with help) tape the short side pieces to the long board both inside and on the outer edge for stability. Repeat on the other side.

You now have the base of your cornice. Next put your batting down and cut to size leaving about 2 inch overhang of the batting to allow the edges of the cornice to be padded as well. Once that is the correct size proceed to cutting the fabric making sure you will have extra to pull over all the edges.

Batting for foam board cornice

Lay the fabric on your work surface, pretty side down, then layer the batting and then the foam board. Our fabric wasn't long enough so we had to sew extra pieces of fabric to each side to make it long enough... The seams hit the edges perfectly.

Next grab your duct tape again and start on the short sides... Pull fabric over and tape all edges down. Go to the other 3 sides and repeat.

Duct tape making foam board cornice
To add stability we used straight pins every so often. For the corners we folded them in and pinned them as well.

Hot glue all along top edge to attach the curtain rod. It holds it perfectly!

Foam board cornice tutorial
Ta Da you are done! Now all you have to do is hang it..we are not perfectionists..we use our hands, fingers, and or arm lengths to measure things if no tape measure is handy...In fact when we hung the one in my basement I said "my side measures 4 fingers from the edge of the window" Madeline said "mine measures 4 loosely" ok good enough!" Haha
Easy cornice tutorial using foam board
Here is the Orange one we made for the boys room. I will also have a full reveal of this room coming up soon.
Here is the one in my basement... Full reveal of my basement makeover coming soon! I need to finish a few things and photograph it first :)
Basement window treatment
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  1. I love how you made this. It turned out great!
    ~Bonnie @ Our Secondhand House

    1. Thank you Bonnie for stopping by and saying Hi! We had fun pulling this together!

  2. How did you hang the board if its made of Foam?

    1. It has the curtain rod attached to the foam board... so you attach the brackets that come with the curtain rod to wall and hand the rod on the brackets.. just like you would if the foam board was not attached to the rod. The foam board is very light weight so it hangs nice.

  3. This method is fantastic because I can use the existing brackets and rod and just glue the rod to the cornice! Another idea I have is to glue the rod to the cornice at the center of the cornice to raise the height of the cornice. Can't wait to try it out!! Thank you so much!



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