Question 1

What material is used to make a cornice board?

Accepted Answer

I was able to use an insulation foam board to make a sturdy cornice board that's much lighter than making a valance with wood. You'd never know this isn't a solid wood piece! I used 1/2" foam board layered three times (or a 1.5" thick board).

Question 2

How thick should a DIY cornice board be?

Accepted Answer

I recommend making your cornice board between 11-14" thick. This will cover hanging blinds or other curtains. Mine is 11" because of fabric limitations, and I almost wish I could have made it thicker. You don't want to go too thick though - don't inhibit that natural light!

Question 3

How much fabric do I need for a cornice?

Accepted Answer

Measure the front and sides of the cornice. You'll need to add 5" to both the length and width of your measurement. So, for a DIY cornice board that's 11" tall and 30" wide with 5" wide side pieces, I recommend a piece of fabric that's 45"x16".

Question 4

What's the difference between a window valance and a cornice box

Accepted Answer

A window valance is a more free-flowing, hanging curtain covering the top portion of a window. A cornice box is a formed, solid piece (usually covered in fabric) that covers the top of a window. They cover the same amount of space; a cornice board is formed, and a valance is hanging fabric.

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