Summary: Learn how to lay tiles in a diagonal pattern, find a diagonal guideline and lay the tiles.
Quarry tiles and terracotta tiles are traditionally laid diagonally across the room, but any tiles can be laid in this fashion. If laying terracotta tiles, remember that terracotta is porous and to prevent the tiles becoming stained when you are grouting the joints, seal them with a branded sealer before you begin laying them. Alternatively you can make up a sealer by mixing boiled linseed oil and white spirit in the ratio of 2 parts linseed oil: 1 white spirit.
Nail a batten along a 45° angle.
Use spacers between tiles to ensure uniform joints.
Measure the triangular gaps around the perimeter of the room.
Finish the joints using a piece of dowel or a grout shaping tool.
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