Short answer
Use 1/4 inch or shorter on very smooth surfaces (cabinets, doors, trim, metal), 3/8 inch on most interior walls and ceilings, 1/2 inch on lightly textured walls, decks and concrete, 3/4 inch on textured ceilings, stucco and masonry, and 1 to 1-1/4 inch on brick and block. The rougher the surface, the longer the nap.
The nap chart
Pick a surface to highlight the nap that matches it. Each row shows the cover cross-section against its surface, plus the pile drawn at real length.
Show the nap for
-
1/4 in. and under
smooth
Very smooth: metal doors, trim, cabinet doors, plaster, smooth drywall
-
3/8 in.
semi-smooth
Smooth to semi-smooth: most interior walls and flat ceilings, paneling
-
1/2 in.
semi-rough
Semi-rough: lightly textured walls and ceilings, rough wood, decks, concrete
-
1 in. to 1-1/4 in.
very rough
Very rough: brick, concrete block, cinder block, fences
Pile lengths in the bars are drawn at actual size in CSS inches, so they are close on most screens but not exact. Cross-sections are scaled up to show the difference.
Nap by surface, in one table
Nap by surface, from Benjamin Moore, Purdy and Sherwin-Williams guidance
| Nap | Surfaces | Paint | Cover | Shop |
|---|---|---|---|---|
| 1/4 in. and under | Very smooth: metal doors, trim, cabinet doors, plaster, smooth drywall | Semi-gloss, gloss and enamels; also primers on smooth work | Woven (microfiber, mohair) or high-density foam | 1/4" covers |
| 3/8 in. | Smooth to semi-smooth: most interior walls and flat ceilings, paneling | Flat, matte, eggshell and satin wall paint | Microfiber, woven, or knit polyester for latex | 3/8" covers |
| 1/2 in. | Semi-rough: lightly textured walls and ceilings, rough wood, decks, concrete | Flat to satin; thicker coatings | Knit polyester or microfiber | 1/2" covers |
| 3/4 in. | Rough: textured ceilings, stucco, masonry | Flat and low sheen; masonry and elastomeric coatings | Knit polyester or a poly and wool blend | 3/4" covers |
| 1 in. to 1-1/4 in. | Very rough: brick, concrete block, cinder block, fences | Masonry paint and heavy exterior coatings | Thick knit polyester | 1"+ covers |
The three makers line up closely. Benjamin Moore sums it up as “the more texture your surface has, the thicker the nap should be.” Purdy adds that low-nap rollers pick up less paint while high-nap rollers hold more for larger projects. Sherwin-Williams also says to use a thicker nap when you apply a thicker paint or a heavier coating.
How to read your surface
- Smooth: run your palm across it and feel almost nothing. Cabinet doors, metal doors, trim, plaster, skim-coated drywall.
- Semi-smooth: most painted drywall in homes. A faint texture you see more than feel.
- Semi-rough: orange peel and light knockdown walls, rough-sawn wood, decks, concrete floors.
- Rough: popcorn and heavy textured ceilings, stucco, split-face masonry.
- Very rough: brick, concrete block, cinder block, fences with deep grain.
Sheen changes the cover, not just the nap
Glossy paint shows everything the roller leaves behind. Purdy pairs glossy sheens and enamels with woven covers because they leave less lint and give smoother results, and recommends knit covers for everyday oil and water-based paints because their open fabric holds and releases more paint. So on a smooth wall in semi-gloss, keep the 3/8 inch nap but choose a woven or microfiber cover; in flat paint, a knit cover is fine. See foam vs microfiber for the shortest naps.
Between sizes?
Go shorter for a smoother look and a higher sheen; go longer when coverage and speed matter more, or when the roller keeps skipping low spots. If you are unsure, roll a test patch somewhere hidden and look at it in raking light once it dries.
Not sure which surface you have? The roller picker turns surface, sheen and texture into a nap. Shopping covers? See the best roller covers by job.
Search 3/8 inch nap covers on Amazon
Questions people ask
What nap roller should I use for walls?
A 3/8 inch nap for smooth or lightly finished drywall. Benjamin Moore calls 3/8 inch “best for walls and ceilings”, and Purdy says walls, ceilings and paneling “require a slightly larger nap size of 3/8-inch”. Move to 1/2 inch if your walls have visible texture.
Is 3/8 or 1/2 inch nap better?
It depends on the wall. 3/8 inch leaves a smoother finish on smooth drywall. 1/2 inch holds more paint and reaches into light texture such as orange peel, but on a smooth wall it can leave more stipple, especially in higher sheens.
What nap gives the smoothest finish?
The shortest one that still covers: 1/4 inch or less, in a woven or microfiber fabric, or a high-density foam roller. Purdy says woven fabrics such as microfiber and mohair leave little lint and a very smooth finish.
What happens if the nap is too long?
On a smooth surface a long nap can leave a bumpy, orange peel texture and more spatter. Benjamin Moore suggests switching to a thinner nap if you see dimples like orange peel.
What happens if the nap is too short?
On a rough surface a short nap skips the low spots: paint sits on the peaks and the pores and mortar lines stay bare, so you end up dabbing them with a brush. Thicker naps hold more paint and push it into texture.
Sources
Last reviewed October 12, 2026. Specs and availability change; check the listing before you buy.