The lumberyard load test that changed my beam sizing

Last month at the 84 Lumber in Dayton I watched a guy argue with the yard manager about a 20 foot LVL beam. The manager grabbed two sawhorses and a sandbag, set the beam up and loaded it to spec right there in the lot. It bowed way more than the guy expected, and he walked away grabbing a bigger size. I started doing quick deflection checks on my own jobs since then, even small ones like headers over 6 foot openings. Anyone else test materials before trusting the stamped numbers?

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