Anyone who has laid tiles knows the frustration of lippage. You set a tile, it looks level, the adhesive cures, and suddenly one edge sits higher than the next. The finish looks uneven, and the only fix is expensive. The Rai Fix clamp solves this problem before it starts.

This guide covers exactly how to use the Rai Fix tile leveling system correctly, what mistakes to avoid, and how to get a consistently flat result on every project.

What the Rai Fix Clamp Actually Does

The Rai Fix clamp is a mechanical tile leveling tool made by Raimondi, one of the most trusted names in professional tiling equipment. It works by holding adjacent tiles at the same height while the adhesive cures underneath. The result is a flat, lippage-free surface.

It does not correct an uneven substrate. If your floor or wall has significant dips or humps, those need to be addressed before tiling begins. What the Rai Fix system does is prevent tiles from shifting or settling unevenly during the curing period, which is when most lippage problems occur.

The system works on both floors and walls and suits tiles from 3mm to 15mm thick as standard. For thicker slabs, tall clips are available.

What You Need Before You Start

Before placing a single tile, make sure you have the right components assembled. The Rai Fix leveling system uses three main parts:

• Clips, which slide under the tile edges and hold the base in position.
• Wedges, which insert into the clips and apply lateral tension to bring adjacent tiles into plane.
• Leveling pliers, which drive the wedges in with consistent, controlled pressure.

Choose your clip size based on your grout joint width. Standard sizes are 1mm, 1.5mm, and 3mm joints. Using the wrong clip size creates gaps that are too narrow or too wide for your grout, which causes finishing problems later.

You will also need your tile adhesive, a notched trowel, a rubber mallet, and standard corner spacers to keep your grid square.

Step-by-Step: How to Use the Rai Fix Clamp Correctly

Step 1: Prepare the Surface and Spread the Adhesive

Start with a clean, flat surface. Sweep away debris and check for any high spots. Apply your tile adhesive with a notched trowel, combing it in one direction to create uniform ridges. Full coverage underneath the tile matters here. Voids in the adhesive bed reduce bond strength and can cause tiles to crack under load.

For large-format tiles over 60cm, back-buttering the tile with a thin skim of adhesive before setting it improves coverage significantly.

Step 2: Set the First Tile and Place the Clips

Lower the tile onto the adhesive bed and press it firmly into position. Beat it gently with a rubber mallet to collapse the adhesive ridges and achieve good contact. Place corner spacers at each corner to keep your grout joint consistent.

Now insert the Rai Fix clips along the tile edges. Slide one clip under each side of the tile, with the tab sitting in the grout joint and the base extending beneath the tile. For tiles larger than 30cm, place two clips per side rather than one.

Step 3: Set the Adjacent Tile

Lower the next tile into position alongside the first, sandwiching the clip tabs between them in the grout joint. Press and mallet this tile into the adhesive just as you did the first. The clips now sit between both tiles, ready to be tensioned.

Step 4: Insert the Wedges With the Leveling Pliers

Take a wedge and slide it into the slot on the clip tab. Use the leveling pliers to push the wedge in firmly. The wedge applies downward pressure on both tiles simultaneously, pulling them into the same plane. You will feel resistance as the wedge tightens.

Do not overdrive the wedge past the breakpoint on the clip. The clip is designed to snap cleanly at the grout joint level once the adhesive sets. Pushing beyond the breakpoint causes it to break during installation rather than after cure.

Step 5: Check Your Level as You Work

After tensioning every four to six tiles, lay a spirit level or straightedge across the surface. The Rai Fix system should be holding everything flat, but checking periodically lets you catch any issues while the adhesive is still workable.

If a tile sits high or low despite the clips being tensioned, lift it, adjust the adhesive bed, and reset. The clamp can only level tiles relative to each other. It cannot compensate for a significantly uneven bed.

Removing the Clips After the Adhesive Cures

This is where most beginners make a mistake. They try to pull the clips out vertically, which either breaks the tile edge or leaves the base embedded under the grout. The correct method is different.

Once the adhesive has fully cured, typically 24 hours for standard cement-based adhesives, use your leveling pliers, a rubber mallet, or simply your foot to knock the protruding tab sideways. Strike parallel to the grout joint, not perpendicular to it. The clip snaps cleanly at the breakpoint, and the base stays below the tile surface, where it causes no problems.

The wedges are reusable. Collect them after each session and store them for the next job.

Common Mistakes That Ruin the Result

Even with the right tools, a few habits consistently cause problems:

• Not preparing the substrate properly: The Rai Fix clamp levels tiles relative to each other, not to a flat plane. A substrate with major undulation still produces an uneven floor.
• Using too few clips on large tiles: One clip per side is enough for tiles under 30cm. Larger format tiles need two per side to prevent rocking during cure.
• Removing clips before the adhesive has set: The adhesive must be fully cured before you knock the tabs off. Early removal lets tiles shift back out of alignment.
• Driving wedges past the breakpoint: Once the breakpoint is reached, stop. Overtightening breaks the clip during installation, and the base drops into the adhesive bed at the wrong depth.

CretePro Trading supplies professional tiling tools and construction materials across Dubai, UAE, Saudi Arabia, Kenya, Nairobi, Kenya, Uganda, Qatar, Oman, Bahrain, Kuwait, Egypt, Tanzania, Ethiopia, Nigeria, and South Africa. Browse the full range of tiling products on the CretePro shop or contact the team to discuss your project requirements.

For full technical specifications on the Rai Fix system, refer to the official Raimondi product page.

Frequently Asked Questions

What is the difference between the Rai Fix clamp and a standard tile leveling clip?

The Rai Fix is specifically a safety withholding hook designed for large format wall tiles and facade cladding. It uses stainless steel hooks to mechanically anchor tiles to the wall substrate, preventing them from falling if the adhesive bond fails.

A standard tile leveling clip and wedge system, such as the Raimondi RLS HD, focuses on keeping floor and wall tiles in the same plane during adhesive cure. Both are Raimondi products, but they serve different primary functions. For floor tile alignment, the RLS clip and wedge system is the correct tool. For vertical large format tile safety, the Rai Fix anchor is the required solution.

Can I use the Rai Fix clamp system on wall tiles as well as floor tiles?

Yes. The clip and wedge component of the Rai Fix system works on both horizontal and vertical surfaces. On walls, the wedges and clips prevent tiles from slumping downward while the adhesive cures, which is a common problem with heavier ceramic and porcelain tiles.

The safety hook component of Rai Fix is specifically designed for facade and wall installation of large format tiles over 30cm, providing a mechanical backup in case of adhesive failure. Both components work together to give you a safe, level, and durable wall tile installation.

How many Rai Fix clips do I need per square meter?

The number depends on the tile size and the layout. As a general guide, standard 60x60cm tiles require approximately two clips per side, meaning eight clips per tile. For a square meter of 60×60 cm tiles laid in a straight grid, you will use roughly 16 to 20 clips. Larger format tiles require more clips per side to prevent flex during the cure period. A useful rule of thumb from Raimondi’s own guidance is to calculate approximately two clip positions per linear meter of tile edge, then adjust for your specific tile dimensions and layout pattern.

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