Double Decker Tiling: Can You Install Tile Over Existing Tile?

Double Decker Tiling? Sounds like a new home décor term, right? Well, as a seasoned repairman with years of tiles and grout under my belt, I promise it’s a thing. If you're wondering whether you can install tile over existing tile, the answer is a hearty and resounding, “YES!”.

But wait, hold that tile adhesive and notched trowel for a minute, because as exciting as this layer-up tile laying tactic can be, it’s not without its potential pitfalls.

When Can I go Double Decker with my Tiles?

"But Mr. Repairman," you say, "I thought you said I could tile over existing tile!" And yes, I did, but that's under the right conditions. Ideally:

1. Your Current Tiles are Well-Attached

Take some time to really get up close and personal with your tiles. If you notice any of them wobbling like a salsa dancer’s hips, then you’re in for some trouble. Loose tiles are a no-go, and you'll need to remove or repair them before moving on.

2. The Surface is Flat and Uniform

Not all surfaces are created equal. If yours looks like it's been through an earthquake or two, then a layer of new tiles may exacerbate such distortions. Make sure the surface of your existing tiles is as flat as a pancake before you start your tile stack.

3. You're Cool with Extra Height

Tiling over existing tile does boost the height of your floor or wall surface. Consider how this affects transitions between rooms or the clearance of your bathroom door.

So How Do I Go About this Double Decker Tiling?

Ready to take the plunge? Here are some steps to take your tile game to new heights:

1. Clean the Existing Tiles

This is the tiling equivalent of brushing your teeth before a dental appointment. It might seem unnecessary but trust me, a clean surface helps the new tiles adhere better.

2. Sand the Tiles

Since you’re essentially sticking tile to tile, you need to give the tile adhesive a little help. Use a power sander to rough up the old tiles so the adhesive has a better grip.

3. Apply a Leveling Compound

If your existing tile surface has tiny dips, a leveling compound can help smooth things out.

4. Lay Down the Tile Adhesive

Next, apply your tile adhesive with the right size trowel. Don't rush. Remember: slow and steady wins the race, and the same is true for tiling.

5. Install the New Tiles

And now, for the moment you’ve been waiting for. Start installing your new tiles, making sure to align them precisely and apply even pressure when setting them down.

6. Grout and Seal

Once your tiles are secured and the adhesive has dried, it’s grouting time. Fill those spaces between your tiles, and make sure you seal them well to protect from moisture.

A Few Tips for Getting Your Double Decker Tiling Right

1. Bigger Tiles are Your Friend: The larger the tile, the less chance your tile layout will trace the outlines of the old tiles beneath. Basically, you get a smoother finish with big tiles.

2. Check your Door Threshold: If your door can't clear the new tile height, you may need to chop off a bit from the bottom or simply, get a new, shorter door!

3. Choose a High-Quality Adhesive: When it’s tile-on-tile action, your adhesive needs to be the MVP. High-quality adhesive ensures strong bonding of both tile layers.

Sealing the Last Tile - With a Smile

All said and done, embarking on a double-decker tiling project is definitely doable for DIYers. Sure, it requires a keen eye, a steady hand, and a bit of patience, but that’s part of the fun - plus, think of that handsome, fresh tile surface that awaits. You can stand back, admire your craftsmanship and say, "Yes. Yes, I did that! Now, onto the next room!”