We have a concrete floor and it was covered with Thinset mortar. We needed to have it removed so that we could install vinyl flooring, so we called Carpet Source. They advertise a "dust free" removal service. And they lived up to their advertisement! They did a great job for us and it was totally "dust free." Their crew was incredibly efficient and they were super-nice people to boot. We could not have asked for a better job! We highly recommend Carpet Source to everyone! They are a good company!