I'm installing floating engineered hardwood over a concrete slab.

Are there situations where it's okay not to use any kind of vapor barrier
at all?

Thanks.

For what you describe? No, not that I know of. -Tom

Thanks, Tom.

I thought so, but something in another thread had made me question it.

Always put a moisture barrier under a floater, over concrete, even if the concrete is on the upper floors of a building.

vapor barrier = cheap insurance!

Thanks, Gary and Floorguy.

Here's another question: the room has two wooden steps leading down to it. Will I need a vapor barrier on top of them also? I'd like to float woodloc over the slab, and assume I'll need to glue down the floor on the steps.

No vapor barrier on the steps and gluing is correct.

Thanks for the response, Jerry.