What consideration should be given to joints between tiles?
It is important to have a joint between tiles to allow for movement in the structure. It is also important that tiles do not butt against one another. Where tiles are in contact with each other, this will increase further the effects of any stress built up within the tiling layer where movement exists or may be anticipated.
Leaving a suitable width of joint between tiles and filling these joints with a suitable grouting material enables localised stress relief to occur and when combined with the use of adequate movement joints, will reduce the risks of any problems occurring.
The width of joint can vary depending on your tiling project. A 6mm joint may be used on a floor, whilst a narrower joint of say 3mm may be used on a wall.
The British
Standard for
tile fixing, BS5385, suggests the following tolerances on finished work.
Flatness and variation from plumb:
± 3mm under a 2m straightedge.
Variation across Joints:
±1mm for joints less than 6mm wide
±2mm for joint 6mm or more wide
Grouts effectively fill the voids between ceramic or natural stone tiles, preventing debris such as water, dirt, dust, debris from filling the gap.
The choice of grouting materials will depend on the width of the joints and the service conditions of the floor or wall.
The joints between tiles should be clean and free from loose material before grouting. Sufficient time should elapse after fixing so as not to disturb the security of the tiles during grouting.
If you use a proprietary grout use it in accordance with the manufacturer's instructions.
The grout should be applied over an area that can be worked within the open time of the material used, working the grout into the joints with a rubber squeegee or grouting trowel, ensuring that the
joints are completely filled.
Remove the surplus grout from the face of the tiles and allow to set. Clean off
tile surface with a damp cloth or sponge. Wide joints may require tooling to provide a dense surface to the joint. Polish tiles with a dry cloth once the grout has set. Joints in floor tiling should be finished as near as is practicable flush with the
tile whereas joints in wall tiling can be slightly recessed.
so if a
tile installation is butt jointed then the joints cannot be filled...
This advice is given from the TTA, which i would have thought all
tile training should follow......