Can I install SunTouch mats on top of an old ceramic tile floor?
Normally, we recommend you consider a “crack isolation membrane” when installing SunTouch over an old floor, especially if the old tile is broken, cracked, or has other symptoms of slab or tile failure. If the old floor looks good (and has been there for several years), then make sure the mortar you use is recommended by the manufacturer for bonding to existing tile.
