I'm building a 12-foot valance, 14" high, 9" deep, made from solid
Tails cut into the front piece would look better.
That's a pretty wide board. Are you concerned about the valance cupping?
R
Normally tails are on the side pieces and pins cut on the front pieces.
The 14" wide board is a glue up and it will be painted on all sides which helps prevent cupping. Near the middle of the valance the width will only be 8" wide, near the corners it is 14" wide but the corners will keep it from cupping. I am more concerned about seasonal expansion/contraction of the wood.
And that will help restrain the cupping.
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