Tiling around a window reveal is one of those jobs that separates a tidy finish from a messy one. With careful planning, the right trim pieces, and precise cuts, you can achieve clean, professional-looking edges that frame your window beautifully. Here's how to do it right.
Understand the Window Reveal
A window reveal is the internal face of the wall between the window frame and the main tiled surface — essentially the sides, top (soffit), and sometimes the sill of the window opening. In New Zealand bathrooms and kitchens, reveals are common on brick-veneer and timber-framed homes alike. Because reveals are exposed edges, they need special attention to look neat and to comply with waterproofing requirements under the relevant NZ Standards and the NZ Building Code (particularly Clause E3 for internal moisture).
Plan Your Layout First
Before you mix any adhesive, spend time planning:
- Centre your tiles on the main wall and work outward so cuts are balanced on each side of the window.
- Decide whether the reveal tiles will overlap the main wall tiles (reveal tiles sit on top) or butt up to them. Overlapping reveal tiles generally look cleaner.
- Measure the reveal depth carefully — you may need to cut tiles to a specific width to fit the sill, sides, and soffit.
- Sketch a quick layout on paper or use a tile layout app to visualise grout lines and avoid awkward slivers.
Choose the Right Edge Trim
Edge trim is the key to a neat reveal. The main options are:
| Trim Type | Best For | Notes |
|---|---|---|
| Schluter / metal tile trim (e.g. Jolly or Rondec profile) | Modern, clean look | Aluminium or stainless; set into adhesive before tiling |
| Plastic PVC tile trim | Budget-friendly | Less durable; avoid in wet areas |
| Bullnose tiles | Traditional look | Requires matching bullnose in same tile range |
| Mitred tile edges | Seamless, high-end | Requires a wet saw with a 45° bevel capability |
For wet areas like showers, metal trim profiles are the most durable and hygienic choice. You'll find a good range at Bunnings or Mitre 10.
Prepare the Surface
- Ensure the reveal substrate is solid, flat, and primed. In wet areas, the reveal must be waterproofed — this is non-negotiable under the Building Code. Use a membrane system such as those from Ardex or Mapei and pay particular attention to the junction between the reveal and the window frame.
- If the substrate is GIB plasterboard in a wet area, it must be a moisture-resistant grade (e.g. GIB Aqualine), and waterproofing membrane is still required over it.
- Fill any gaps between the window frame and substrate with a flexible, paintable filler or backing rod and sealant before tiling.
Tile the Reveal Step by Step
1. Fix Your Trim Profiles
If using metal trim, bed it into tile adhesive along the outer edge of the reveal first. Use a spirit level to keep it straight. Allow it to set before tiling into it.
2. Tile the Sill First
Start with the window sill (the horizontal bottom face). Apply tile adhesive using a notched trowel appropriate for your tile size — check the adhesive manufacturer's guidelines. Press tiles firmly, checking they are level and have a very slight fall (1–2°) away from the window to shed water.
3. Tile the Sides and Soffit
Work up the sides and across the top (soffit). Use tile spacers to keep grout joints consistent. Where reveal tiles meet the main wall tiles, ensure grout lines align for a seamless look — this is where your upfront planning pays off.
4. Cut Tiles Accurately
Use a wet saw (tile saw) for straight cuts and a angle grinder with a diamond blade or tile nipper for curves around the window frame. Measure twice, cut once. In NZ, wet saws can be hired from most tool hire shops if you don't own one.
5. Allow Adhesive to Cure
Follow the adhesive manufacturer's cure time before grouting — typically 24 hours, but check the product data sheet.
6. Grout and Seal the Edges
Apply grout to all joints. Do not grout the junction between the tile and the window frame — this movement joint must be filled with a flexible silicone sealant that matches your grout colour. This allows for thermal movement and prevents cracking. Sika and Mapei both offer colour-matched silicone products.
Common Mistakes to Avoid
- Skipping waterproofing on wet-area reveals
- Grouting movement joints instead of using silicone
- Not aligning grout lines between the reveal and main wall
- Using tiles that are too large for a narrow reveal — keep proportions in mind
- Forgetting a slight fall on the sill
When to Call a Professional
If your window reveal is in a shower or wet area, waterproofing is a critical step that must be done correctly to comply with the NZ Building Code. Poorly waterproofed reveals are a leading cause of moisture damage in NZ homes. If you're not confident with waterproofing membranes, tiling on tricky substrates, or making precise cuts on expensive tiles, it's well worth calling a qualified tiler. You can find experienced local tilers on tradedirectory.co.nz.
Note: Tiling itself is not restricted work under NZ law, but any associated plumbing or electrical work must be carried out by a licensed tradesperson registered with the PGDB or EWRB respectively.
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