How are these tiles differ from each other and how to identify these?
There is a plain clay, usually red called satillo. These are usually unglazed and need to be sealed. There are reddish and orangish in color . Red bodied tiled is what you call ceramic. These are made of a red clay and you can see it in the body of the tile. These are glazed over to create most of their hardness. There are 2 types of porcelains. These are generally the harder but even these tiles vary in hardness and brittleness. This type is what is generally sold as a porcelain tile. Very good in quality usually. This is the type of porcelain that is usually sold as porcelain. These are glazed ove to create their color and look. True porcelains, you can see the color of the tile go all the way through to the bottom of the tile. More costly because of this. These are usually used in commercial areas because the color will never wear off. Any questions you can e mail me through my avatar and check my qualifications there. GL
Installing tile over concrete is the best way to install floor just make sure all the cracks are filled in with a ardex filler or even mortar smoothed out. As far as the old tile glue on just try to scrap it clean as best as possible and go from there. Also make sure u sweep and clean the area good free of dirt as best as possible.
