How Do You Lay Porcelain Tile Over A Brick Floor?
Porcelain floor tiles require a strong, immobile backing to prevent any movement that could crack or loosen the tiles. An existing brick floor makes a fine underlayment, as long as the surface is flat and not mounded. Even the flattest brick floor is likely to have some gaps and cracks in it if it’s old, so make sure to properly prepare it with liquid leveler, which is a watery form of cement. Thoroughly mop the brick floor with floor cleaner. Let it dry completely. Pour liquid floor level over any areas of the brick that have cracks, dips or gaps, letting the leveler fill them in and even it out with the surrounding floor. Divide the floor into four quadrants by snapping two intersecting lines with your chalk snapline. The intersection should be right in the middle of the floor. Spread thin-set mortar over the intersection, using a notched trowel and covering a few square feet. You should be able to see the chalk lines through the mortar. Press the first porcelain tile into the mortar
