Is this flooring waterproof?

Yes. The rigid vinyl core and plank construction are waterproof, so standing water and spills do not swell the planks. Dry up standing water promptly to protect the subfloor.

Can it go over concrete or in a basement?

Yes, vinyl plank works below grade over a dry concrete slab. The slab must be flat and free of moisture problems, and a moisture barrier or underlayment is often recommended.

Does it need underlayment?

Check the specific plank for an attached pad. Where there is none, a thin underlayment improves sound and comfort and helps bridge minor subfloor imperfections.

How does it compare with glue-down vinyl?

The rigid click planks are stiffer underfoot and float over the subfloor, which hides small imperfections. Glue-down vinyl is thinner, quieter and harder to replace plank by plank.