What to Avoid When Tiling Your Home (Expert Checklist)

Tiling is one of those home improvement areas where the mistakes are often invisible at first - and expensive when they eventually surface. Knowing what to avoid when tiling your home can save you thousands in repair costs and give you a result that looks professional and lasts for decades.

This checklist covers the most important pitfalls to avoid, covering materials, technique, preparation, and planning.

Avoid Buying the Wrong Amount of Tiles

One of the most common and most frustrating mistakes is running out of tiles mid - job. Tiles from different production batches have slight colour variations. If you run out and reorder, the new tiles may not match exactly.

What to do instead: Always order 10 - 15% more tiles than your measured area requires. Keep leftover tiles for future repairs.

Avoid Choosing Tiles Based on Showroom Samples Alone

A small tile sample looks very different once it covers an entire floor or wall. Colours, patterns, and textures can look very different at scale.

What to do instead: Try to see large panels or completed installations in a similar size room before deciding. Many tile suppliers have display areas - visit them.

Avoid Using Indoor Tiles Outdoors

Tiles designed for indoor use are not rated for outdoor temperature changes, UV exposure, and frost. They can crack, fade, or become dangerously slippery when wet outside.

What to do instead: Always check the slip rating (R rating) and the intended use classification of any tile before purchasing. Outdoor tiles should have a minimum R11 slip rating.

Avoid Starting Without a Layout Plan

Beginning from the wrong corner or without planning the layout leads to small awkward cuts in visible places, off - centre patterns, and a result that looks amateurish.

What to do instead: Find the centre of the room, lay tiles out dry (no adhesive) to plan the pattern and work out where cuts will fall.

Avoid Tiling Over Damaged or Hollow Surfaces

Hollow or damaged surfaces will cause adhesive failure. Any tile laid over a hollow area is effectively floating - it will crack under load.

What to do instead: Tap every surface before tiling. Repair hollow or damaged areas properly before starting.

Avoid Skipping Waterproofing in Wet Areas

Waterproofing is the most important step in any bathroom or shower tiling job. Without it, water gets behind the tiles, causing mould, rot, and eventually complete tile failure.

What to do instead: Apply a proper waterproofing membrane to all shower walls and floors, and around the bath. Wait for it to cure before tiling.

Avoid Tiling Over Grease or Dust

Adhesive will not bond to a dirty surface. Kitchens particularly need the walls cleaned of grease and cooking residue before tiles are applied.

What to do instead: Clean and degrease the surface thoroughly. Apply primer if recommended by the adhesive manufacturer.

Avoid Using Too Little Adhesive

"Spot bonding" - small blobs of adhesive at tile corners - leaves most of the tile unsupported. Tiles with hollow spots crack under load.

What to do instead: Apply adhesive evenly across the full back of each tile (back - buttering) or use a properly notched trowel to ensure full coverage.

Avoid Grouting Before Adhesive Cures

Grouting too early causes the adhesive movement to crack the grout. Give adhesive the full cure time specified by the manufacturer - usually 24 hours minimum.

What to do instead: Wait. Rushing this step wastes all the work that came before it.

Avoid Uneven Tile Alignment

Tiles that are not level or aligned create shadows and make the entire surface look poor. This is especially noticeable on large wall tiles.

What to do instead: Check every few tiles with a spirit level or laser level. Adjust before the adhesive sets.

Avoid Ignoring Lippage

Lippage is when one tile sits higher than the tile next to it. Even a few millimetres of lippage on a large tile looks and feels wrong.

What to do instead: Use tile levelling clips and wedges for large format tiles. This is particularly important for floor tiles.

Avoid Inconsistent Grout Lines

Varying the width of grout lines throughout a job looks sloppy and is very difficult to fix without removing tiles.

What to do instead: Use plastic tile spacers consistently throughout the entire job.

Avoid Using the Wrong Grout

Not all grouts are suitable for all situations. Using wall grout on floors, or using unsanded grout in wide joints, causes premature failure.

What to do instead: Choose the correct grout type for the joint width and location.

Avoid Grouting Too Thinly

Grout joints that are only partially filled look poor and allow water and dirt to get beneath the grout surface.

What to do instead: Work the grout firmly into the joints with a float, ensuring every joint is fully packed.

Avoid Not Sealing Grout

In kitchens, bathrooms, and any wet area, unsealed grout stains, absorbs moisture, and can grow mould.

What to do instead: Seal grout in wet areas once it has fully cured (usually 48 - 72 hours after grouting).

Avoid Filling Expansion Joints With Grout

The gap around the perimeter of a tiled floor and at tile - to - wall junctions must be filled with flexible silicone - not grout. Grout will crack here because the floor and wall move slightly independently.

What to do instead: Use appropriate coloured silicone sealant at all internal corners and floor - wall junctions.

Avoid Starting Heavy Use Too Soon

Using a shower or walking heavily on a new tile floor before the adhesive and grout have fully cured can cause tiles to move or grout to crack.

What to do instead: Wait at least 24 hours before light foot traffic, and 48 - 72 hours before using a shower or applying heavy loads.

• [ ] Ordered 10 - 15% extra tiles
• [ ] Layout planned before adhesive applied
• [ ] Surface tapped for hollow spots and repaired
• [ ] Waterproofing applied and cured in wet areas
• [ ] Surface cleaned and primed
• [ ] Correct adhesive chosen for tile type and surface
• [ ] Full adhesive coverage (no spot bonding)
• [ ] Spirit level used throughout
• [ ] Spacers used consistently
• [ ] Adhesive fully cured before grouting
• [ ] Correct grout type used
• [ ] Grout joints fully packed
• [ ] Grout sealed (in wet areas)
• [ ] Expansion joints filled with silicone, not grout

Knowing what to avoid when tiling your home is half the battle. Most tile failures come from skipping preparation, using the wrong materials, or rushing through key steps. Following this checklist - whether you are doing the work yourself or supervising a tiler - gives you the best chance of a result that lasts.

Want the job done right without the worry? Contact Excellence Tilers in Cape Town for professional tiling services. We follow every step of the process carefully - because good preparation is what makes tiles last.