27 Feb 2025

Short answer: Yes, but only if done correctly.

Tiling over existing tiles is a bit like putting fresh icing on a cracked cake—sometimes it works beautifully, other times, you just end up with a mess. It can be a great way to save time, cut down on demolition dust, and avoid the hassle of removing old tiles. But if done wrong, you might find yourself regretting it quicker than a dodgy home renovation reality show contestant. So, let’s get into the nitty-gritty of what works, what doesn’t, and how to get the best results.

Pros and Cons of Tiling Over Existing Tiles

Pros:

  • Less time, less mess – No need to chisel, hammer, and haul away rubble.
  • More budget-friendly – Fewer labour costs and less waste to dispose of.
  • Avoids damage to waterproofing – If you’re tiling over a bathroom floor, keeping your waterproof membrane intact is always a win.

Cons:

  • Increases floor height – The extra layer can affect door clearance, especially if you exceed the standard floor tile thickness in millimetres.
  • Needs a rock-solid base – If your current tiles are loose, you’re asking for trouble.

Adhesion isn’t guaranteed – If prep isn’t done right, those new tiles could pop off like bottle caps.

How to Check if Your Existing Tiles Are Suitable

Before you slap new tiles over the old ones, give them a health check:

  • The Tap Test – Give each tile a tap with a blunt object. If it sounds hollow, it’s loose—rip it up.
  • Cracks and damage – Broken tiles won’t make a good base. If they’re cracked, they need to go.
  • Water damage – Bathrooms and kitchens see a lot of moisture. If tiling over a shower floor, make sure the minimum slope for a shower floor in Australia is met to prevent pooling.

Surface Preparation: The Key to a Successful Tile-on-Tile Installation

Each material has its pros and cons. Here’s the breakdown:

Like any good DIY project, preparation makes all the difference. Here’s what you need to do:

  1. Scrub the tiles clean – Remove grease, soap scum, and any mystery gunk.
  2. Roughen up the surface – Sanding or applying a tile primer helps the new tiles grip.
  3. Level the playing field – A self-levelling compound will smooth out dips and bumps, ensuring proper tile placement.

Choosing the Right Adhesive for Tiling Over Tiles

Not all adhesives can handle sticking tile to tile. Here’s what works best:

  • Flexible tile adhesives – Ideal for bathroom floors and areas prone to movement.
  • Standard adhesives – Okay for walls, but not recommended for high-traffic floors.
  • Application technique matters – A notched trowel ensures even spread and a strong bond when tiling over tiles.

Step-by-Step Guide: How to Tile Over Tiles

  1. Assess and prep your existing tiles – Clean, level, and check for damage.
  2. Choose the right adhesive – A flexible option will give the best hold.
  3. Apply adhesive properly – Spread evenly with a notched trowel.
  4. Lay the new tiles – Use spacers to keep things aligned and prevent a wonky look.
  5. Grout and seal – Give the tiles time to set before grouting and sealing.

Common Mistakes to Avoid When Tiling Over Tiles

  1. Skipping surface prep – If the surface isn’t right, the job won’t last.
  2. Using the wrong adhesive – Not all glues are created equal, especially when tiling over existing tiles.
  3. Ignoring height issues – Extra layers can create clearance problems with doors.
  4. Not allowing enough curing time – Rushing the drying process leads to failures.

FAQs About Tiling Over Tiles

Can you tile over bathroom tiles?

Yes, but waterproofing is crucial. If tiling on a fibre cement sheet or waterproof membrane, proper sealing is needed. Also, the minimum slope for a bathroom floor in Australia must be maintained.

Do I need a primer before tiling over tiles?

Most of the time, yes. A primer or sanding the tiles helps create a better bond and prevents adhesion failures.

How long does tile-on-tile installation last?

If done correctly, just as long as regular tiling. Using the correct mortar bed thickness for floor tiles in millimetres is crucial to avoid cracks over time.

What is the best tile adhesive for tiling over tiles?

Flexible adhesive is the safest bet, especially in wet areas or where movement is likely.

Final Verdict: Should You Tile Over Tiles?

If your existing tiles are solid, level, and properly prepped, tiling over them can be a great solution. But if there are cracks, height concerns, or waterproofing risks, ripping them up might be the better move.

Alternative Solutions:

  • Screed over tiles to create a fresh base if tiling over old tiles isn’t ideal.
  • Use an appropriate tile underlayment for a smoother surface, especially when tiling on concrete floors.
  • Consider tiling over a waterproof membrane in wet areas, ensuring proper adhesion and longevity.

The Final Word

Tiling over tiles isn’t rocket science, but it’s also not a slap-dash job. Get the prep right, use the right materials, and your new tiles will look as good as new. If you’re tiling over a bathroom floor, maintaining the right tile bed mix ratio and using the correct tile underlay thickness will help you achieve a professional finish.

Need expert tiling advice? Contact The Bathroom Renovators today and let the pros handle it!

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