We have a large portion of our house with ceramic flooring which is now looking very old fashioned. It has large grout lines (3/8 inch) which are white and almost impossible to keep clean. We do not want to have the entire floor taken up and replaced and were wondering if new modern porcelain with very minimal grout lines can be installed right over top of the existing ceramic floor successfully.
Flooring – Can porcelain tiles be installed over ceramic tiles
flooring
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Best Answer
Although I would never do this myself, eHow has a step-by-step for this.
Keep in mind that doing this will add thickness to the floor, so transitions into other rooms might be tricky. According to This paper "an abrupt increase in height" of 1/4" (6mm) "is considered to be a threshold level for consideration of trip hazard for a pedestrian".
If this is done in a bathroom, the toilet flange (and/or other fixtures) will likely have to be raised to compensate for the new floor height.