A gap between your skirting board and the floor is one of those niggly issues that can make an otherwise tidy room look unfinished. Whether it's a hairline crack or a noticeable gap, the good news is that most fixes are well within a confident DIYer's reach — and the materials are readily available at your local hardware store.
Why Does the Gap Appear?
Before you reach for the caulk gun, it pays to understand what's caused the gap. The most common reasons include:
- Timber movement – New Zealand's humidity swings cause timber to expand and contract seasonally. This is especially common in older villas and bungalows with native timber floors.
- Settling – Houses naturally settle over time, shifting the floor or wall framing slightly.
- Floor coverings – Replacing carpet with hard flooring (like timber, vinyl, or tiles) often leaves a gap where the old skirting no longer reaches the new floor level.
- Poor original installation – Sometimes the skirting was simply never fitted tightly to begin with.
Understanding the cause helps you choose the right fix. A gap caused by ongoing timber movement, for example, needs a flexible solution rather than a rigid filler that will crack again.
Assessing the Gap Size
The size and consistency of the gap will guide your approach:
| Gap Size | Likely Best Fix |
|---|---|
| Up to ~3 mm, consistent | Paintable flexible caulk or gap filler |
| 3–10 mm, consistent | Quad moulding or scotia |
| Irregular or large (10 mm+) | Refit skirting or add quad moulding |
| Gap varies along the run | Combination of caulk and quad moulding |
Option 1 – Flexible Caulk or Gap Filler
For small, consistent gaps, a paintable flexible acrylic caulk is the quickest fix. Look for products labelled as flexible or suitable for interior joinery gaps.
What you'll need:
- Flexible acrylic caulk (available at Bunnings or Mitre 10)
- Caulking gun
- Masking tape
- Damp cloth or wet finger for smoothing
- Interior paint to finish
Steps:
- Clean the gap — remove dust, old filler, and any loose material.
- Run masking tape along the floor edge to keep lines neat.
- Apply a steady bead of caulk into the gap.
- Smooth with a wet finger or caulk tool.
- Remove the tape before the caulk skins over.
- Once dry, paint to match the skirting or floor finish.
Tip: Avoid using rigid plaster-based fillers in this location — they'll crack as the timber moves. Always choose a product rated as flexible.
Option 2 – Quad Moulding or Scotia
For larger or uneven gaps, quad moulding (also called scotia or quarter-round) is the most professional-looking solution. It's a small timber or MDF moulding that sits in the corner between the skirting and the floor, neatly covering the gap.
What you'll need:
- Quad moulding (pine or MDF, from PlaceMakers, Bunnings, or Mitre 10)
- Mitre saw or mitre box and hand saw
- Nail gun or hammer and lost-head nails
- Wood filler and sandpaper
- Paint or stain to match
Steps:
- Measure each wall run carefully.
- Cut internal corners at 45° mitres and external corners accordingly.
- Nail the quad into the skirting board only — not into the floor. This allows the floor to move freely underneath without cracking the moulding.
- Fill nail holes with wood filler, sand smooth, and paint or stain to match.
Nailing into the skirting (not the floor) is the key trick most DIYers miss. If you nail into a floating timber or laminate floor, you'll restrict its movement and risk buckling.
Option 3 – Refit or Replace the Skirting
If the gap is large and irregular, or the skirting itself is damaged, it may be worth removing and refitting it. This is more involved but gives the best result. You'll need to:
- Carefully lever off the existing skirting with a flat bar (protect the wall with a piece of timber).
- Check whether the floor or wall framing has moved significantly.
- Refit the skirting lower, or pack behind it if needed, then nail back into the wall studs.
- Finish with caulk and paint.
If you're not confident with mitre cuts or working with timber, this is a great job for a local carpenter.
Painting and Finishing
Once your repair is done, a neat paint finish makes all the difference. Resene and Dulux both offer interior trim paints in a wide range of whites and colours. Use a small angled brush for a clean edge, and apply two coats for a durable finish.
When to Call a Professional
Most skirting gap repairs are straightforward DIY jobs. However, consider calling a qualified carpenter if:
- The gap is large, uneven, or getting worse over time (this could indicate ongoing structural movement or subfloor issues).
- You notice the floor itself is bouncy, uneven, or showing signs of moisture damage — this may point to a subfloor problem that needs investigation.
- You're not confident with mitre cuts or timber joinery.
- You're renovating and want a seamless, professional finish throughout.
A licensed carpenter can also advise whether the movement is cosmetic or a sign of something more serious. You can find qualified local carpenters on tradedirectory.co.nz.