Tiling a feature wall with large rectangular tiles set vertically is a great way to add height and drama to a room. With careful planning and the right materials, it's a project a confident DIYer can tackle — though the larger the tile, the more critical your preparation becomes. Here's what you need to know to get it right first time.
Plan Your Layout Before You Touch a Tile
Good tiling is 80% planning. Start by measuring your wall carefully and sketching out your layout on paper or using a free tile calculator tool.
- Decide on your bond pattern. Vertically oriented rectangular tiles (such as 300×600 mm or 400×800 mm) are commonly laid in a stacked (brick) bond or a straight/grid pattern. A stacked vertical pattern is very popular for feature walls.
- Find your centre line. Snap a vertical chalk line down the centre of the wall. Work outward from this line so any cut tiles are equal on both sides — this looks far more professional.
- Check for equal cuts. If your layout leaves a sliver of tile at the edges (less than half a tile width), shift your centre line by half a tile to avoid awkward cuts.
- Mark a horizontal datum line. Use a spirit level to draw a perfectly level horizontal line near the bottom of the wall. This is your starting reference — never trust a floor or skirting board to be level.
Prepare the Surface Properly
Large tiles are unforgiving — any flex, hollow, or unevenness in the substrate will telegraph through or cause tiles to crack or debond over time.
- Substrate options: Plasterboard (standard GIB board) is acceptable for dry areas. For wet areas such as a bathroom feature wall, you must use a tile backer board or moisture-resistant sheet that complies with MBIE Building Performance requirements under NZ Building Code clause E3 (Internal Moisture).
- Check for flatness: Use a long straightedge (at least 1.8 m) across the wall. Hollows or humps greater than about 3 mm over 1.8 m need to be filled or ground back before tiling.
- Prime the surface: Apply a suitable primer/sealer recommended by your adhesive manufacturer. Ardex and Mapei both offer primers designed for their adhesive systems — always check compatibility.
Choose the Right Adhesive for Large Format Tiles
Large rectangular tiles are heavy and have a greater surface area, so adhesive selection is critical.
- Use a large-format tile adhesive (often labelled C2 or C2TE to European standard EN 12004). These have improved slip resistance and extended open time, which you'll need when positioning big tiles.
- Apply adhesive using a notched trowel — for tiles over 400 mm in any dimension, a 12 mm notched trowel is typically recommended, but always check the adhesive manufacturer's datasheet.
- Back-butter the tile as well. For tiles 600 mm or larger, apply a thin skim of adhesive to the back of the tile in addition to the wall. This ensures full coverage (aim for full coverage in wet areas and good coverage in dry areas — check BRANZ guidance and your adhesive manufacturer's datasheet for specific requirements).
- Brands such as Ardex, Mapei, and Sika all offer suitable large-format tile adhesives available from tile shops and Mitre 10 or PlaceMakers.
Laying the Tiles Vertically
Setting Out and Starting Point
For a feature wall that doesn't have a floor-to-ceiling run (e.g., a half-wall or splashback), start at the top and work down so the cut tiles sit at the bottom where they're less visible. For a full-height wall, start from your datum line and work upward, then go back and cut the bottom row.
Fixing the Tiles
- Spread adhesive on the wall in manageable sections (no more than about 0.5–1 m² at a time to avoid skinning).
- Press each tile firmly into the adhesive with a slight twisting motion, then use a rubber mallet and beating block to bed it evenly.
- Use tile spacers or wedge spacers to maintain consistent grout joints. For large rectangular tiles, a 2–3 mm joint is common, but check the tile manufacturer's recommendation.
- Regularly check tiles are plumb and flat using a spirit level — both vertically and horizontally. Large tiles can rock if the adhesive bed isn't even.
- Allow the adhesive to cure fully before grouting — typically 24 hours, but check the product datasheet.
Grouting and Finishing
- Choose a grout colour that complements your tile. Unsanded grout suits joints under 3 mm; sanded or epoxy grout suits wider joints.
- Mix grout to a smooth, lump-free consistency and apply with a rubber grout float, working diagonally across the joints.
- Clean excess grout with a damp sponge before it hardens, rinsing frequently.
- Once cured, apply a grout sealer to protect the joints, especially in wet areas.
Movement Joints — Don't Skip These
NZ conditions (temperature swings, building movement) mean movement joints are essential. Install silicone joints at internal corners, where the tiled wall meets the floor or ceiling, and in large fields of tile (generally every 3–4.5 m). Use a silicone colour-matched to your grout. This is a requirement under good tiling practice and referenced in BRANZ guidelines.
When to Call a Professional
While laying feature wall tiles is DIY-friendly in dry areas, there are situations where you should engage a qualified tiler from tradedirectory.co.nz:
- Wet areas (showers, baths): Waterproofing membranes must be correctly applied before tiling. Failures can lead to serious moisture damage and may breach the NZ Building Code. A Licensed Building Practitioner (LBP) may be required for certain restricted building work.
- Very large or heavy tiles (over 800 mm): These require experience to handle safely and bed correctly.
- Any electrical work behind the wall (e.g., heated tile systems): This is restricted electrical work and must be carried out by a registered electrician — see EWRB.
- Plumbing penetrations through tiled walls must be done by a licensed plumber — see PGDB.
- If you're unsure about building consent requirements, always check with your local council before starting.
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