Do these tiles need glue or underlay?

No. Each tile has its own self-adhesive backing and a soft pad, so you press it straight onto a flat, dry surface.

Can I use them on concrete?

Yes, on a flat, dry, clean concrete floor. Damp or dusty concrete weakens the bond, so seal or clean it first.

Score the face with a utility knife and snap or cut through the pad. Cut with the pad up so the blade follows the backing.

Yes. Peel up the damaged square and press a new one in its place, which is the main advantage over glue-down carpet.

They work for full rooms, but lay them in a straight grid and keep seams tight. They are not a substitute for stretched wall-to-wall carpet.

At Walmart, for $12.09, as of our latest check.

$12.09at WalmartChecked Nov 11

Prices are checked against each store and labelled with when.