I have a quarry tiled floor in my kitchen which is about six inches lower than the room that leads into it. I'd like to raise the floor height so that I don't have to step down and leave a void under it to help route pipes etc etc. Can I fix joists directly to the quarry tiles and then put chipboard flooring on top of this (with a laminate later on)? If so how do I fix the joists to the floor and do I need air circulation etc. The house was built in 1914.