SiLOSSiLOS

A mailbox post that should break, not bend

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1The short version

The instinct is to build the sturdiest mailbox post on the block, and the instinct is wrong. USPS placement guidelines call for the mailbox to sit 41 to 45 inches from the road surface to the bottom of the box or the point of mail entry, set 6 to 8 inches back from the curb. The Federal Highway Administration's post recommendation is the part most people get backwards: a 4-by-4 wooden support or a 2-inch diameter standard steel or aluminum pipe, buried no more than 24 inches deep, specifically because the best supports are stable but bend or fall away if a car hits them.

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2What goes wrong

The intuitive fix, a heavier, more solid post, is explicitly the wrong move: FHWA guidance names heavy metal pipes, concrete posts, and improvised supports like milk cans filled with concrete as dangerous specifically because they don't yield. A rigid post turns a glancing hit from a plow or a car into a collision with an immovable object instead of a bent pipe, which is worse for the vehicle and anyone in it, not just the mailbox.

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3The rest of the checklist

The house or apartment number belongs on the mailbox itself, and if the box sits on a different street than the house, the full street address goes on it too. A mailbox that's home-built or custom rather than store-bought with the Postmaster General's seal of approval needs local postmaster approval against USPS size and construction standards before it goes up.

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4The first hour

Measure from the actual road surface, not the edge of the lawn, since the 41-to-45-inch height and 6-to-8-inch setback are both measured from the road itself. Setting the post at the right height and distance before it's set in the ground is the only part of this job that isn't easily fixed later.

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