Abstract: A method of forming a tiled floor without adhesive beneath the tiles comprises laying the tiles, applying filler between adjacent tiles after laying, and holding the tiles in relative position. A flexible sheet with apertures can be laid on a substrate and the apertures filled with grouting material and the tiles laid on the sheet, the spaces between the tiles receiving filler material. The tiles may have a groove in peripheral sides to provide a keying effect for the filler material. The filler material may be settable after application and hold the tiles in position.