Is Bermuda flooring actually waterproof?

Yes. It has a waterproof WPC core, so standing water and spills won't swell the planks the way they damage hardwood or laminate. That makes it suitable for kitchens, bathrooms and basements.

What does the 20 mil wear layer mean?

The wear layer is the clear top coat that takes the traffic. At 20 mil it is a heavy-duty rating, above the 12 mil common on budget planks and aimed at pets, kids and busy rooms.

How thick is it and does that matter?

It is 8.5mm thick, which is on the thicker end for rigid-core vinyl. A thicker plank feels more solid underfoot and hides minor subfloor imperfections better than thin vinyl.

Can it go over existing hard floors?

Rigid-core planks are usually floated over a flat, sound subfloor, including some existing hard surfaces. Check that the old floor is level and stable, and that door clearances still work with the added height.

Does it need underlayment?

Many rigid-core WPC planks have an attached underlayment pad. If yours does not, a thin underlayment helps with sound and minor leveling. Confirm what the specific plank includes before installing.

How does it compare with laminate?

Vinyl is fully waterproof and more forgiving of moisture than laminate, whose core can swell. Laminate can look sharper and cost less, but Bermuda is the safer pick for wet rooms and pets.