IS CASING THE SAME AS TRIM?
Casing is a type of trim — specifically the trim around doors and windows.
WHAT IS CASING MADE OF TODAY?
Mostly MDF or wood (pine, poplar, oak).
WHAT SIZE IS MODERN CASING?
Common sizes:
Unless you want to stare at drywall gaps forever — yes.
WHAT’S NEXT FOR CASING?
Casing has survived empires, revolutions, industrialization, and more than a few questionable design trends. It’s outlived stone temples, Victorian excess, the Ranch‑era curve obsession, and now the modern flat‑stock takeover. And here’s the truth:
It’s not going anywhere.
Whether it’s carved limestone, hand‑planed pine, MDF, or some future composite, casing will still be doing the same job it’s been doing for 4,000 years:
And the math?
Yeah… that’s not going anywhere either.
Waste will still be a puzzle.
And someone will still be standing there thinking,
“There’s got to be an easier way to do this.”
We’re willing to bet that in another 4,000 years, casing will still be wrapping doorways — and the math will still be just as confusing as it is today.
Luckily, for this century at least, you don’t have to do it by hand, instead use our trim calculator.
CHIPTRIM handles the numbers.
You handle the craft.
Last updated: February 21, 2026