Sanding right up to door frames and built-in furniture is one of the trickiest parts of any floor sanding job. A drum or belt sander can't reach these tight spots, so you'll need a combination of specialist tools and careful hand work to blend the edges seamlessly with the main floor area.
Why Edge and Detail Sanding Matters
When you hire or use a large drum sander for the main floor area, it typically stops 50–100 mm short of walls and obstacles. If you skip the detail work, you'll end up with a patchy finish — raw or rough timber around the perimeter while the centre looks beautifully smooth. The goal is to match the grit sequence and finish level across the entire floor, including every nook and cranny.
Tools You'll Need
- Edge sander (disc sander): A rotary edge sander handles most skirting board and straight-edge areas. It's aggressive, so use it carefully.
- Detail sander (triangular oscillating sander): Perfect for getting into corners and tight angles around architraves and door stops.
- Random orbital sander: Great for blending between the edge sander marks and the main floor, and for final fine-grit passes.
- Hand scraper: A sharp cabinet scraper is invaluable for the last few millimetres right against a door stop or furniture base where no power tool will fit.
- Sanding blocks and paper: For final hand-sanding in very tight spots — wrap sandpaper around a small block of timber to keep pressure even.
You can hire edge sanders and detail sanders from most tool hire shops, or from Bunnings and Mitre 10.
Matching Your Grit Sequence
Always mirror the grit sequence you used on the main floor. If you started at 40-grit, moved to 60-grit, then finished at 80-grit on the drum sander, do the same progression with your edge and detail tools. Skipping grits leaves scratches that show up badly once the finish coat goes on.
| Area | Recommended Tool | Grit Sequence (typical) |
|---|---|---|
| Straight edges near skirtings | Edge (disc) sander | 40 → 60 → 80 |
| Corners and architrave profiles | Detail/oscillating sander | 60 → 80 → 120 |
| Very tight gaps (door stops) | Hand scraper + sanding block | 80 → 120 |
| Blending edge to main floor | Random orbital sander | 80 → 120 |
Technique Around Door Frames
Door frames (architraves) have a profile that curves or steps away from the floor, making it impossible to get a power sander flush against the timber. Here's a reliable approach:
- Use the edge sander to get as close as safely possible — usually within 20–30 mm of the architrave.
- Switch to the detail sander with a triangular pad to work into the angle between the floor and the architrave base.
- Finish by hand with a sanding block or folded sandpaper, working with the grain right up to the frame.
- Scrape if needed: A sharp hand scraper used at a low angle can remove old finish or level the grain right at the base of the architrave without damaging the frame itself.
Take care not to sand into the painted or stained architrave — masking tape applied carefully along the base of the frame can protect it while you work.
Technique Around Built-In Furniture
Kitchen islands, wardrobes, and other built-ins present similar challenges. The base of a built-in often sits directly on the floor, leaving only a small gap or none at all.
- Check the gap first. If there's a kickboard or plinth, you may be able to remove it temporarily to expose the floor underneath and sand it properly before replacing.
- If the gap is very small (less than 10 mm), accept that you may not be able to sand right to the edge. In this case, clean the area thoroughly and apply finish by brush — the furniture will cover it anyway.
- Blend carefully where your edge sanding meets the main floor. Use a random orbital sander with 80- then 120-grit to feather out any disc sander swirl marks before applying finish.
Applying Finish in Tight Spots
Once sanding is complete, vacuum thoroughly and tack-cloth the area. Apply your chosen finish — whether it's a waterborne polyurethane, an oil, or a hardwax oil — by brush or small roller in the tight areas first, then blend into the main floor finish while it's still wet. Products from Resene and Wattyl include floor finish ranges suitable for NZ conditions; always follow the manufacturer's data sheet for recoat times and ventilation requirements.
Good ventilation is important — open windows and doors where possible, and wear an appropriate respirator. Check WorkSafe NZ guidance on working safely with solvent-based products.
When to Call a Professional
Floor sanding looks straightforward but produces a highly visible result — mistakes are hard to hide. If your floor has:
- Deep gouges, cupping, or significant movement near door frames (which can indicate moisture issues under the floor)
- Parquetry or intricate inlay patterns around built-ins
- Very thin boards that have been sanded multiple times before
…it's worth getting a professional floor sander involved. They have the experience and specialist tooling to handle complex edge work without damaging your frames or furniture. You can find qualified local floor sanding professionals on tradedirectory.co.nz.
For any concerns about moisture under your floor — particularly relevant in many parts of New Zealand with our damp winters — BRANZ has useful guidance on timber floor performance and moisture management.
