Most people who keep a safe in the garage put it directly on the concrete slab and then bolt it down. A rubber mat, horse stall mat, or thin moisture barrier is a common extra layer, but wood is usually less preferred in a garage because it can trap moisture or make anchoring less straightforward.

What people actually do

  • Concrete floor, bolted down: the most common setup for security and stability.
  • Rubber mat or stall mat under it: used to reduce moisture contact and minor floor issues, especially on damp slabs.
  • Elevated on wood: less common in garages; usually only when someone is trying to solve a specific moisture or leveling issue, and it can make the safe easier to move unless it is still anchored well.
  • Not elevated: often preferred if the safe is anchored to a slab and the garage is reasonably dry, because the lower and heavier it sits, the harder it is to tip or pry.

Best-practice setup

If the garage is the only practical spot, the usual advice is:

  1. Put the safe on the slab.
  2. Add a rubber mat only if you want a moisture buffer.
  3. Anchor it to concrete.
  4. Keep it out of direct sight from the garage door and street view.

Simple rule of thumb

If your garage stays dry, go floor + bolt down. If the slab sweats or you get seasonal moisture, add a rubber/moisture barrier , but avoid anything thick or soft that makes the safe wobble.

TL;DR

Most people do floor on concrete, bolted down , sometimes with a rubber mat underneath. Wood or elevation is less common unless you have a specific moisture problem to solve.