Sanding Grit Sequences for Hardwood Floors

Grit Choice Matters More Than You Think

When sanding hardwood floors, each pass should make the next pass easier. And choosing the right sandpaper grit is the best way to do this. The right sanding grit sequence ensures a clean and smooth end result. Your machines also run cooler and you spend less time correcting problems later.

A rushed or improvised grit selection can leave costly mistakes. Lingering chatter marks, edger scratches visible through stain, and extra passes eat into time and profit.

The challenge with hardwood floor sanding grit selection is you can’t always rely on a single sequence. Wood species, finish type, and floor condition all factor into how a contractor selects their abrasives. Follow this guide for tips on selecting the right sanding grit for your job — from the first cut to the final grit before stain.

Understanding Grit Numbers in Practical Terms 

Grit numbers define the particle size on the sandpaper. This helps contractors determine how aggressive the abrasive cuts, or "abrades", the wood.

The lower the grit number, the more coarse the sandpaper. Use lower grits to remove material quickly, and higher grits to refine scratches or prepare the surface for finish.

Each grit range has a job. Here's a simple way to think about them:

Coarse grits (24–36) are for flattening and removal.
- Norton's Blaze 7-7/8"x29' Sanding Belt is a great choice with grits of 24 and 36 available.

Medium grits (40–60) refine and correct
- The Berger-Seidle AbraPrime 3m Cubitron Belt comes in grits of 36 and 60.

Fine grits (80–100) smooth and prepare.
- Try the Red Heat 16" Sanding Screen for larger flooring jobs.

Very fine grits (120+) are for blending and between coats.
- The Durite 16" Sanding Screen comes in a number of grits, including 120, 150, 180, and 220 when you need a finer grit.

We cannot overemphasize how important it is to follow grits in order from coarse to fine. Skipping ahead too soon or starting out too fine will end up creating more work in the long run.

How to Choose the Starting Grit

The starting grit sets the tone for the entire sanding process. Use an abrasive that effectively removes damage without creating deep scratches. But pay close attention to the initial condition of the floor. If you start too coarse, you could end up creating more work for yourself.

Start with a coarse grit when:

• The floor has deep cupping or crowning
• Old finishes are thick or uneven
• There are heavy scratches, paint, or adhesive residue
• Boards are uneven after installation

Starting at 36 or 40 grit saves time and tackles these issues well, even though it looks aggressive at first.

You won't need anything that coarse for floors in better condition. Starting too coarse on clean hardwood floors creates scratches you'll have to address later. For floors with minimal damage, light finish wear, or were recently installed, starting at 40 or even 60 grit often makes more sense.

Building a Reliable Grit Progression

Once you have your starting grit, focus on your progress rather than specific numbers. Pay attention to how the floor looks after each pass of the sander. As you adjust your sanding grit sequence, each step should completely remove the scratches from the previous grit.

A common and reliable progression for a full refinish might look like:

36 → 50 → 80 → 100

For floors starting in better shape, try:

40 → 60 → 80 → 100

Avoid skipping too far ahead. Jumping from 36 straight to 80 may save a belt, but it rarely saves time. Skipping the 50 grit means the 80 grit will have to work harder to do its job. That means it will heat faster and leave inconsistent scratches that show up later under stain.

Smaller jumps between grits mean faster refinement and cleaner results.

Matching Grit Choice to Wood Species

There’s no single grit that’s best for hardwood floors. Not all hardwood species react the same way to abrasives.

Softer species like red oak and pine can be more forgiving. They're easy to sand and show fewer scratch issues if grit steps are consistent. If the floor damage is light, you might start with 60 or 80 grit.

Keep in mind that very soft woods like pine are prone to deep scratches and gouges. If the damage isn't too bad, consider starting your sanding grit sequence with 80, or even 100, to avoid oversanding.

Harder or denser woods — maple, hickory, Brazilian cherry — demand more discipline. Scratches don’t disappear as easily, and skipping grits almost always comes back to haunt you. Along with a coarser starting grit, consider adding an extra intermediate step in your grit sequence.

Grit Selection at the Edges

Edge sanding is where grit discipline matters most. You can usually blend out scratches from drum sanders. But edger scratches are tricky. If they're too coarse or inconsistent, they will telegraph through the finish.

Here are a few tips when selecting sandpaper grits for edges:

• Match the edger grit to the drum grit or go one step finer
• Never jump ahead on the edger compared to the field
• If you finish the field with an 80 grit, finish the edges at 80 or 100 — not 60

Check out our Edger Disk inventory to find what you need.

Final Grit and Finish Compatibility

The final sanding grit before stain affects how the finish interacts with the wood.

Ending too coarse can leave visible scratches. Ending too fine can close the grain, leading to blotchy stain or adhesion issues.

For most hardwood floors:

• 80–100 grit is ideal before stain
• 100–120 grit works well for natural or water-based finishes
• 150–180 grit is great for a very smooth finish between coats

The goal is uniform scratch depth across the entire floor — field, edges, and corners.

The Contractor’s Key Takeaway

Choosing the right grit is something of an art. Rather than abiding rigid rules, you need to understand what each grit does and let the floor inform your decisions. Once you've mastered that, you'll work faster, burn fewer abrasives, and enjoy more consistent results.

Final Thought: Floor Sanding Mistakes to Avoid

So, you've got your sandpaper stocked up and you're ready to go. But all the careful grit selection won't matter if you skip your prep work. Before you get sanding, avoid these sanding mistakes to get the most out of your sandpaper. 

Not Prepping the Floor 

Clean and clear the area of debris before you start sanding. Any debris left on the floor can create scratches or uneven sanding while you work.

Sanding Against the Grain

This goes without saying, but we're saying it. Always sand in the direction of the wood grain. Otherwise you'll end up with visible scratches that detract from the beauty of the floor.

Using Inconsistent Pressure

If you're heavy-handed in different parts of the floor, you may create dips and gouges in your floor. This leads to uneven looking work. Keep a consistent touch and let the weight of the machine do the work for you.

Not Vacuuming Between Grits 

All that sanding creates dust and other particulates. After completing each number in your grit sequence, be sure to vacuum and remove all that fine dust. Otherwise it will reduce the effectiveness of the remaining steps in your sequence.