The short answer to what grit sandpaper for drywall: 120 to 150 grit for the main sanding of dried joint compound, dropping to 100 only for heavy ridges and tool marks, and stepping up to 220 for final touch-ups and between skim coats. Coarser than 100 tears the paper face and gouges the mud; finer than 220 polishes the compound slick and wastes time. That’s the rule — but the difference between a wall that photographs flat and one that telegraphs every joint under evening light lives in the details: screens versus paper, pole sanders versus sponges, pressure, lighting, and dust control. Here’s the full playbook, Q&A style.
The Grit Sequence, Explained
- 80 grit: Almost never. It removes compound fast but leaves scratches that flash through paint and it shreds drywall face paper on contact. Reserve it for knocking down disastrous globs — then immediately re-coat, because you’ll have damaged the surface.
- 100 grit: The heavy-correction grit. Ridges from a worn knife, overlap marks, and proud fastener spots yield quickly. Use light pressure and stay on the mud.
- 120 grit: The workhorse. If you buy one grit for a taping job, buy 120 — it levels normal imperfections efficiently without deep scratching. Most pros run their pole sanders at 120.
- 150 grit: The finishing grit. After 120 does the shaping, 150 erases the scratch pattern and feathers edges to invisible. Well-applied final coats can be sanded with 150 alone.
- 180-220 grit: Touch-up territory: final pass under critical lighting, scuffing between skim coats on a Level 5 finish, and smoothing patches on walls that will wear gloss or eggshell paint, which highlight everything.
Note that drywall sanding sequences are short compared to woodworking — you’re smoothing soft compound, not removing material through progressive grits. One or two grits per job is normal; three means your taping needs work. The better your knife skills with drywall compound, the less sanding exists at all — a tight final coat needs ten minutes a room, a sloppy one costs an hour and a dust storm.
Sanding Screens vs. Sandpaper
Both work; they clog and cut differently.
| Factor | Sanding screen | Sandpaper |
|---|---|---|
| Clogging | Open mesh sheds dust, barely clogs | Loads up with compound dust |
| Cut | Aggressive, two usable sides | Slightly finer finish at same grit |
| Lifespan | 3-5x paper in drywall dust | Cheap but disposable |
| Scratch pattern | Slightly coarser; follow with fine paper on critical walls | Cleaner final surface |
| Cost | ~$1-2/sheet | ~$0.50-1/sheet |
The common pro pattern: 120 or 150 screen on the pole sander for the field, then 150-220 paper or a fine sanding sponge by hand for finish passes, corners, and around electrical boxes. Precut sheets and screens sized for standard pole-sander heads (roughly 3-1/4 x 9-1/4 inches) save fighting with a utility knife.
The Tools That Matter
- Pole sander: A swivel-head pad on a 4-foot handle. It bridges high and low spots so you sand flat planes instead of following the humps, reaches ceilings without a ladder, and covers a room in a fraction of hand-sanding time. Keep the head flat — tipping it onto its edge digs crescent gouges that need re-mudding.
- Hand sander: The same pad without the pole, for eye-level work and control near trim.
- Sanding sponges: Fine/medium blocks for inside corners — the angled edge gets into the corner without scuffing the opposite face — and damp-sanding small patches. A lightly damp sponge on a small repair produces zero dust and a beautiful feather, at the cost of speed.
- Vacuum sanders: Hand and pole heads with a shop-vac hose, or powered drywall sanders (Festool Planex-style, $300-$900, or $40-a-day rentals) that capture 90-plus percent of dust at the pad. For whole-house jobs or occupied homes, they pay for themselves in cleanup avoided.
Round out the kit from our drywall tools list; the sander is only as good as the knives that came before it.
Technique: How the Pros Keep It Flat
- Light pressure, moving constantly. Let the grit cut; leaning on the pad digs troughs in soft compound and burnishes hard spots.
- Sand the edges, respect the center. Joints fail visually at their feathered edges. Work the perimeter of each joint to nothing, and go easy over the tape line — sand through to tape and you owe another coat.
- Never touch bare paper. Scuffed face paper fuzzes up and flashes under paint. If you scratch it, prime the fuzz and skim it.
- Check with light, not fingertips. Hold a work light or flashlight tight to the wall, raking across the surface — every hump and scratch throws a shadow. This single habit is the difference between amateur and pro results.
- Circle the flaws, don’t chase them. Mark problem spots in pencil during the light check, fix them in one pass, re-check. (Pencil, never pen or marker — ink bleeds through paint.)
- Know when to re-coat instead. Any hollow or gouge deeper than a light pass fixes faster with a swipe of compound than with sandpaper. Sanding is for the last 5 percent, not for sculpting.
Dust Control
Drywall dust is gypsum plus silica-bearing fines that migrate through an entire house and choke shop vacs without the right filter. Minimum protocol: N95 respirator (a paper comfort mask is not enough), plastic sheeting taped over doorways and HVAC registers, the furnace fan OFF, and a box fan exhausting out a window. Vacuum with a HEPA or drywall-rated filter bag — standard shop-vac filters clog in minutes and blow fines back into the room. Better: buy dust-control joint compound for final coats (the dust falls in heavy clumps instead of clouding), damp-sponge small patches, or run vacuum-assisted sanding. Sweep the bulk, vacuum the rest, and damp-mop last; dry-wiping painted trim just smears gypsum paste.
Grit Cheat Sheet by Task
- Standard taped joints, final sand: 120 then 150.
- Heavy ridges, overlaps, worn-knife tracks: 100, then 150.
- Skim coat / Level 5 finish: 150, with a 220 final pass under raking light.
- Small patches and repairs: 150 sponge, or damp-sponge for zero dust.
- Between coats of compound: quick 120 knock-down of crumbs and ridges only — full sanding waits for the final coat.
- Textured surfaces before skim: 80-100 to knock down texture peaks, then skim and finish normally.
Compound Type Changes the Sanding
What you’re sanding matters as much as the grit. Lightweight all-purpose and topping compounds sand easily — 150 glides through them, which is why finishers use topping for final coats. All-purpose and taping compounds dry harder and lean on 120. Setting-type compounds (“hot mud,” the 20/45/90-minute bags) cure chemically to a nearly sand-proof surface: plan your knife work carefully with them, use the easy-sand variants for anything you’ll need to dress, and expect 100 grit and effort where regular hot mud stands proud. If a joint laughs at your 120, you’re almost certainly on setting compound — switch strategy to a skim of lightweight topping over it rather than grinding.
FAQ
Can I use 80 grit on drywall?
Only to demolish a serious mud disaster you intend to re-coat. It scratches too deep for finish work and destroys face paper instantly.
Is 220 grit too fine for drywall?
For the main sand, yes — it clogs fast and cuts slowly. As a final kiss on Level 5 work or glossy-paint walls, it’s exactly right.
Wet sanding or dry sanding drywall?
Damp-sponge sanding wins for small patches in finished rooms: no dust, good feather. Dry sanding wins for speed and flatness on whole rooms — a sponge follows contours, a pole sander creates flat ones.
Do I sand between every coat of compound?
No — just scrape or lightly knock down ridges and crumbs between coats. Save real sanding for after the final coat, once, at 120-150. See our drywall finishing guide for the full coat-by-coat sequence.
Buy 120 and 150, put them on a pole, keep the pressure light and the raking light on — that’s ninety percent of professional drywall sanding in one sentence.
