Is this floor really waterproof?

Yes. The SPC core is waterproof, so standing water on the surface will not swell the planks. Water can still get under the edges at perimeter gaps, so wipe up spills and seal the room's edges as usual.

Can it go in a basement?

Yes. It is rated for above grade, on grade and below grade, which is where solid wood and most laminate are not recommended. A flat, dry subfloor is still required.

How does the click-lock install work?

Planks click together edge to edge and float over the subfloor without glue or nails. The attached IXPE pad goes down with the plank, so you do not need a separate underlayment.

What is the wear layer and does it matter?

The wear layer is 12 mil, the clear top coat that takes the scuffs. It is fine for homes; floors with a 20 mil layer resist wear longer in heavy-traffic or commercial settings.

Does it come with a warranty?

No. It is sold as a closeout item as is, with no warranty and no returns, so check the planks and the room measurements before you buy.

Can it go over existing tile or concrete?

Yes, as a floating floor over a flat, sound substrate, including concrete and well-bonded tile. Fill low spots first; ridges and dips telegraph through a thin 4.5mm plank.