Last updated: 15 July 2026
The right paint roller for most interior walls in Melbourne homes is a 230mm synthetic roller with a short to medium nap (6–12mm). Short nap rollers (6mm) suit smooth plasterboard walls, medium nap (10–12mm) suits textured surfaces, and thick nap (12–18mm) is best for ceilings. Modernize Solutions uses professional-grade rollers on every interior painting job and matches nap thickness to the surface type for optimal paint coverage and finish quality.
A paint roller is made up of two primary components: the frame and the cover. The frame provides structure and comfort, while the cover holds and distributes paint. The main variable is the roller cover, specifically its nap thickness, material, and width.
What rollers do professional painters actually use?
Professional painters use a 230mm synthetic roller cover with a 10-12mm nap for walls, a 270mm cover with a 12-18mm nap on an extension pole for ceilings, and a 100mm short-nap mini roller for doors and trim. After more than three decades painting Melbourne homes, that three-roller setup covers almost every residential job. Pros also replace covers frequently rather than washing them to death, because a worn cover sheds lint and leaves uneven texture no technique can hide.
| Job | Pro setup |
|---|---|
| Interior walls | 230mm synthetic, 10-12mm nap |
| Ceilings | 270mm synthetic, 12-18mm nap, extension pole |
| Doors, trim, cabinets | 100mm mini roller, 4-6mm nap |
| Rough render or brick | 230mm, 18-20mm nap |
What is roller nap?
Roller nap is the length of the fibres on the roller cover, measured in millimetres. It sets how much paint the roller holds and how it lays down, which makes it the single most important thing to get right when picking a roller. Thicker naps hold more paint and suit rougher, textured surfaces. Thinner naps hold less paint and give a smoother, more even finish.
A short nap roller is anything up to about 6mm, best for smooth surfaces like doors, trim, and flat plasterboard. A medium nap roller runs 10 to 12mm and is the everyday choice for most interior walls. Thick nap covers of 12mm and up are for ceilings and rough surfaces.
Paint roller nap chart
Use this chart to match nap size to the surface you are painting.
| Nap size (mm) | Nap name | Best surface | Finish it gives |
|---|---|---|---|
| 4-6mm | Short nap | Doors, trim, cabinets, smooth plasterboard | Smoothest, no texture |
| 6-10mm | Short to medium | Smooth to lightly textured walls | Very smooth, even |
| 10-12mm | Medium nap | Standard interior walls (the all-rounder) | Even, slight texture |
| 12-18mm | Thick nap | Ceilings, textured walls | Holds more paint, fewer passes |
| 18-20mm | Extra thick | Rough render, brick, besser block | Fills deep texture |
How do you choose the right nap for your project?
What nap roller for walls?
For smooth interior walls, a short nap roller (6mm) gives an even coat without adding unwanted texture, while medium nap (10–12mm) handles lightly textured surfaces better. For slightly textured walls, a medium nap (10-12mm) works better, it gets into the surface texture and ensures consistent colour.
What nap roller for ceilings?
Most ceilings suit a medium to thick nap roller (12-18mm) because it holds more paint and reduces the number of passes needed overhead. In Australia nap is sold in millimetres, so ignore US guides quoting inch fractions: the 12mm-18mm range on the shelf at Bunnings or your trade store is the ceiling zone.
| Surface Type | Recommended Nap Size | Roller Width | Best Material |
|---|---|---|---|
| Smooth plasterboard walls | 6mm (short) | 230mm | Synthetic |
| Lightly textured walls | 10–12mm (medium) | 230mm | Synthetic |
| Ceilings | 12–18mm (thick) | 270mm | Synthetic |
| Rough render / brick | 18–20mm (extra thick) | 230mm | Synthetic or blended |
| Doors and trim (oil-based) | 4–6mm (short) | 100mm mini | Natural fibre |
Key takeaway
An extension pole attached to the roller frame lets you reach ceilings without a ladder. It also gives better directional control and reduces physical strain.
What roller cover material should you use?
Synthetic covers
Best for water-based paints, synthetic covers are durable, do not shed fibres easily, and clean up well, making them the go-to choice for most interior painting in Melbourne homes.
Natural fibre covers
Ideal for oil-based paints. Natural fibre covers absorb paint well and give a smooth release.
Blended covers
A combination of synthetic and natural fibres. Practical when switching between water-based and oil-based products on the same project.
According to Dulux Australia’s painting guides, using a synthetic roller cover with water-based paints like Dulux Wash&Wear produces the most even, lint-free finish on interior walls. A roller works well on walls, but kitchen cabinet doors are a different job, see our guide on spray vs brush for kitchen cabinets for which method actually gets a smooth result.
| Material | Best Paint Type | Durability | Fibre Shedding | Cleanup | Price Range |
|---|---|---|---|---|---|
| Synthetic | Water-based | Excellent | Very low | Soap and water | $8–$15 |
| Natural fibre | Oil-based | Good | Moderate | Mineral turps | $12–$20 |
| Blended | Both | Good | Low | Varies by paint type | $10–$18 |
Natural fibre covers should be reserved for oil-based enamels, as water-based paints can cause natural fibres to swell and shed.
Key takeaway: For most Melbourne interior painting jobs, a 230mm synthetic roller with a 10mm nap is the most versatile choice, it works across smooth and lightly textured walls with water-based paints like Dulux Wash&Wear.
What are the best tips for using a roller to paint walls?
For a professional-quality finish, proper roller technique matters as much as choosing the right nap size, loading, the W pattern, and maintaining a wet edge are the three fundamentals. For more detail on preparation and technique, the Dulux painting guide is a useful reference. The Master Painters Association also recommends replacing roller covers regularly to avoid lint transfer and uneven texture.
- Prep your space: Cover floors and furniture with drop cloths. Use painter’s tape to protect trim and edges. If you’re weighing up DIY vs professional painting, roller technique is one of the biggest skill gaps.
- Load the roller properly: Dip the roller and roll it back and forth on the tray slope to distribute paint evenly.
- Use the W technique: Paint a large W shape, then fill in the gaps without lifting the roller.
- Keep a wet edge: Work in sections and always overlap into the previous wet area before it dries.
Common roller painting mistakes to avoid
- Not prepping the surface: Clean and prime surfaces before painting for proper adhesion.
- Using the wrong nap size: Match the nap to the surface texture.
- Skipping the second coat: One coat is rarely enough for full coverage and durability. Learn more in our complete guide to interior painting.
- Pressing too hard: Light, even pressure gives a much better result than forcing the roller.
Frequently asked questions
What size paint roller is best for interior walls?
A 230mm synthetic roller with a short to medium nap (6–12mm) is best for most interior walls. Short nap (6mm) suits smooth plasterboard, while medium nap (10–12mm) handles lightly textured surfaces. This is the most versatile setup for residential painting across Melbourne homes.
What nap roller should I use for ceilings?
Use a medium to thick nap roller (12–18mm) for ceilings. The thicker nap holds more paint and reduces the number of overhead passes needed. Pair it with a 270mm wide roller and an extension pole to reach the ceiling without a ladder while maintaining better directional control.
What is a short nap roller?
A short nap roller has a cover pile of around 4–6mm. The short fibres hold less paint but lay it down smoothly, which makes them the right choice for smooth surfaces like new plasterboard, doors and trim where you want minimal texture in the finish.
What is a medium nap roller?
A medium nap roller has a pile of around 10–12mm. It is the all-rounder professional painters reach for on interior walls: enough fibre to hold good paint volume and handle lightly textured surfaces, without leaving the heavy orange-peel texture a long nap produces on flat walls.
Can I use the same roller for water-based and oil-based paint?
No. Synthetic roller covers are best for water-based paints, while natural fibre covers are ideal for oil-based paints. Using a natural fibre roller with water-based paint causes the fibres to swell and shed. If you need to switch between paint types on the same project, use a blended synthetic-natural fibre cover.
How often should you replace a paint roller cover?
Professional painters replace roller covers regularly throughout a project to maintain a consistent, lint-free finish. For DIY projects, replace the cover when it starts shedding fibres, losing its shape, or leaving uneven texture on the wall. A quality synthetic cover can handle 2–3 rooms before replacement is needed.
Conclusion
For most interior walls in Melbourne homes, a 230mm synthetic roller with a short to medium nap will handle the majority of the work. Ceilings usually need a slightly thicker nap and an extension pole, see our ceiling painting guide for more detail. Professional Melbourne painters at Modernize Solutions use premium roller covers and replace them regularly throughout a project to maintain a consistent, lint-free finish across every wall and ceiling.
If you’d prefer to leave the rolling to the professionals, the Modernize Solutions interior house painting service covers all of Melbourne. We roll walls and ceilings for homeowners across the inner west every week, from our painters in Seddon through to house painting in Newport.
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Related service: Interior Painting.
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