Tile Spacer — Plastic Cross That Sets Uniform Grout Joints

A tile spacer is a small plastic cross or wedge inserted between tiles during installation to maintain consistent joint width before the mortar sets.

What It Is

Tile spacers hold tiles at a fixed distance from one another while the thin-set mortar beneath them cures. Without spacers, tile joint widths vary as tiles shift during setting, resulting in uneven grout lines that are visible in the finished floor or wall.

Spacers are placed at the corners where four tiles meet, or along shared edges for wall tile. Once the mortar has reached initial set — typically 24 hours — spacers are removed and the joints are filled with grout. Some tile setters leave plastic cross spacers in place and grout over them, though this is not best practice because the plastic can telegraph through soft grout.

The spacer size chosen determines the final grout joint width. Small joints look clean and minimize grout maintenance; wider joints allow more tolerance for tiles that are not perfectly sized or calibrated.

Types

Cross spacers are the standard shape — a simple plus sign placed at tile corners. T-spacers are used at wall edges or when tiles are offset. Wedge spacers are used in pairs to level tiles on wall installations with uneven faces. Horseshoe or U-shaped spacers support the bottom edge of wall tiles to keep them from sliding during setting.

Where It Is Used

Tile spacers are used in every tile installation — floors, walls, showers, backsplashes, countertops, and outdoor tile. They are a consumable part of every tile job, not a permanent component.

How to Identify One

Tile spacers are small plastic pieces, typically white or yellow, visible between tiles during installation. They are fully removed before grouting in professional installations. If grout cracks in a grid pattern matching the original tile layout, it may indicate spacers were left in place and prevented proper grout bonding.

Replacement

Tile spacers are single-use consumables. A new supply is needed for each installation or repair.

Tile Spacer — FAQ

What size tile spacer should I use?

Common sizes range from 1/16 inch to 1/2 inch. Small tiles like mosaic typically use 1/16-inch joints. Standard floor and wall tile uses 1/8 to 3/16 inch. Large-format tile often uses 3/16 to 1/4 inch. Handmade or irregular tile may require 1/4 to 3/8 inch to accommodate variation.

Should I remove tile spacers before grouting?

Yes. Remove all spacers once the thin-set has reached initial set, before grouting begins. Spacers left in the joints prevent grout from fully filling the space and can cause the grout to crack or crumble over the plastic.

Can I use objects other than plastic spacers to space tile?

Some installers use coins, nails, or folded cardboard as improvised spacers. These can work for a one-time DIY job, but plastic spacers are inexpensive, precisely sized, and much easier to remove cleanly.

Do I need spacers for large-format tile?

Yes, but large-format tiles also need lippage control clips or leveling clips in addition to spacers. These hold the face of adjacent tiles flush while also maintaining the joint width, addressing the warping and variation that large tiles are prone to.

How do I remove tile spacers without disturbing the tile?

Use a flat utility knife blade, a grout saw tip, or small needle-nose pliers to lever out each spacer once the thin-set is firm but not fully cured. Waiting too long makes removal harder and risks scratching the tile face.