A tiled wall can look excellent on the first row and noticeably uneven by the time it reaches the ceiling. The difference is often down to small details: checking the setting out, keeping tiles level and knowing how to use tile spacers correctly. Spacers are inexpensive, but they are one of the simplest ways to achieve consistent grout joints and a professional-looking finish.
They are not a substitute for a flat background, suitable adhesive or careful fitting. Used properly, however, they keep each tile in position while the adhesive cures and make the finished grid far easier to grout cleanly.
What tile spacers do
Tile spacers create an equal gap between adjacent tiles. This gap becomes the grout joint, which gives the installation a regular appearance and allows a little tolerance for minor differences in tile size and wall or floor movement.
Most standard spacers are small plastic crosses. They are available in several widths, commonly from 1mm to 10mm, although the right choice depends on the tile, the location and the look you want. T-shaped spacers are useful at the end of a run, while horseshoe-shaped packers and wedges can help with adjustments around edges, trims and uneven backgrounds.
Do not confuse ordinary spacers with a tile levelling system. Levelling clips and wedges are designed to reduce lippage, where one tile edge sits higher than the next. They can be particularly helpful with large-format porcelain, but they do not set the grout-joint width on their own. In many cases, you will use both clips and spacers.
Choosing the right spacer size
The smallest possible joint is not always the best choice. A narrow 1mm or 2mm joint can look smart with carefully made, rectified porcelain tiles, which have precisely cut edges. It also demands a very flat surface and accurate fitting. On a slightly uneven wall or floor, small variations become much more obvious when the joints are tight.
For many wall tile installations, a 2mm or 3mm spacer provides a clean, practical joint. Floor tiles often suit 3mm, 5mm or wider, especially where tiles are large, have pressed rather than rectified edges, or are being fitted in a space where movement needs to be accommodated.
Natural stone, handmade tiles and Victorian-style reproduction tiles usually need a more considered approach. Their edges and dimensions may vary slightly by design, so a wider joint can look more natural and gives room to maintain an even overall layout. Follow the tile manufacturer’s recommendation where one is given, particularly for outdoor porcelain and large-format tiles.
Grout colour also affects the decision. A contrasting grout makes every joint highly visible, so consistency matters even more. A grout close to the tile colour creates a quieter effect but will not hide poor spacing or uneven lines.
Prepare before you place the first spacer
Spacers cannot correct a wall that is out of plumb or a floor with dips and high spots. Check the background with a long straightedge before tiling. If it needs levelling, deal with that first using the appropriate preparation materials. A sound, clean and suitably primed background helps adhesive bond properly and gives you more control during fitting.
Next, dry lay a section where practical, especially on floors or with patterned tiles. This reveals where cuts will fall and helps you avoid an awkward, narrow strip at one side of the room. On walls, mark a level datum line and begin from a straight batten where needed, rather than relying on a bath edge, worktop or floor that may not be level.
Plan perimeter and movement joints before you start. Tiles should not be packed tightly against walls, shower trays, baths, door frames or fixed units. These changes of plane are normally finished with a suitable flexible sealant, not rigid grout. A spacer can help maintain the gap while fitting, but it should not encourage you to grout every gap you see.
How to use tile spacers on walls
Spread adhesive only over an area you can tile before it skins over. Comb it in straight, consistent lines using the correct notched trowel, then press the first tile firmly into place with a slight sliding action. Check it is level before continuing. If the first tile is wrong, every row above it follows the same error.
Place a spacer between the tile edges as you add the next tile. Standard cross spacers can be positioned upright at the corners, with one arm between each edge. This is usually the clearest method for maintaining the joint. At the end of a row, use a T-spacer or turn a cross spacer as required.
Check the line of tiles regularly with a spirit level or straightedge. Spacers keep gaps equal, but they do not stop a row drifting if the tiles have been set fractionally out of line. For wall tiles, tile wedges are useful beneath the first row or around openings where a small adjustment is needed. Do not use spacers as load-bearing supports for heavy tiles.
With large wall tiles, back-buttering may be necessary as well as applying adhesive to the wall. This improves coverage and reduces voids. Add levelling clips according to their instructions if the tile format and background call for them, then keep the joints consistent with suitable spacers.
How to use tile spacers on floors
Floor tiling follows the same principle, although setting out is particularly important because the eye naturally follows joints across a room. Establish square reference lines from the main entrance or focal point, then work in manageable sections. Avoid kneeling or walking on freshly laid tiles.
Place spacers at each corner as you lay tiles, checking both the joint width and the surface level. A long straightedge across several tiles is more useful than checking one tile at a time. If an edge is sitting proud, lift the tile and correct the adhesive bed rather than trying to force it down with pressure alone.
For plank-shaped porcelain, check the manufacturer’s guidance on brick-bond or staggered patterns. Many long planks have a slight natural bow, and an offset of no more than one-third is often recommended to reduce lippage. Spacers will maintain the width of the joint, but the laying pattern and substrate flatness determine whether the floor feels level underfoot.
Remove spacers before grouting
Unless the spacer manufacturer specifically says otherwise, remove ordinary plastic spacers before the adhesive has fully hardened. Leaving them too close to the surface can lead to weak spots in the grout, and they may show through pale or thin joints.
The timing depends on the adhesive and site conditions. You want the tiles firm enough that removing a spacer will not disturb them, while the adhesive is still soft enough for the spacer to come out cleanly. For many installations, this means returning after a short curing period rather than waiting until the following day, but always check the adhesive instructions.
Use the point of a spacer, a small pick or a suitable hand tool to lift them out carefully. Do not dig aggressively into the joint and damage the tile edge. Once they are removed, clear excess adhesive from the joints before it sets. Grout needs sufficient depth to bond correctly and form an even finish.
Common spacer mistakes to avoid
The most common mistake is assuming every tile box needs the same spacer. A 2mm joint may be appropriate for rectified bathroom porcelain but unsuitable for a rustic floor tile or handmade splashback. Choose the joint for the product and installation, not simply because it is the spacer size already in the toolbox.
Another problem is placing spacers flat beneath the tile corners rather than between the edges. This can leave plastic too near the face of the tile and make it difficult to achieve a properly filled grout joint. Keep them upright in the joint wherever possible, and remove them at the correct time.
It is also easy to rely on spacers without checking the overall layout. Measure across several tiles as you work. A small difference caused by tile calibration, an irregular edge or too much adhesive can build into a visibly uneven line over a long run.
Finally, do not use grout to bridge movement joints or hide poor preparation. Flexible sealant, suitable trims and correctly prepared backgrounds are all part of a durable tiled finish.
For projects where tile size, edge finish or pattern makes the choice less clear, bring a sample tile into the Caversham Tiles or Altwood Tiles showroom. Seeing the tile, spacer width and grout colour together is often the quickest way to make a sound decision before the adhesive is mixed.