"buddd" wrote in message

A friend mention that one can buy a fireproof sheet that can be placed
on the floor and thereby satisfy the legal requirement.

Does anyone know of a product that can do this and where I can buy it?

Cement board will work and it available at tile stores. You may want to
consider using some tile or slate flooring if you want to be more
decorative. You can also find a place that specializes in woodstoves and
fireplaces.