Floor Sanding Made Simple: Grit Sequence for a Smooth Finish

Wood floors take a beating over time—scratches, dents, stains, and dullness are all signs that sanding is due. Whether you’re refinishing an old hardwood floor or prepping a new installation, the right grit sequence is critical to achieving a professional-grade finish.

Why Sanding Floors Matters

Floor sanding does more than just strip away old finishes. It levels uneven boards, erases scratches, and opens up the wood grain so stains and sealers absorb evenly. Rushing this step or choosing the wrong grits can leave visible marks or a blotchy finish after staining.

Tools You’ll Need

• Drum sander or belt floor sander
• Edge sander for corners and perimeters
• Wet/dry sandpaper sheets for hand touch-ups
• Vacuum and tack cloths
• Protective gear (mask, ear protection, safety glasses)

Best Sandpaper Grits for Floor Sanding

• 36–40 grit: Heavy removal of old finish and leveling boards.
• 60 grit: Removing scratches from coarse sanding and refining the surface.
• 100 grit: Smoothing and preparing the floor for stain or sealer.
• 150 grit: Optional final pass for ultra-smooth, natural finishes.

Step-by-Step: Sanding a Hardwood Floor

1. Start with coarse grit. Use 36–40 grit to strip old finishes and level boards. For hand touch-ups, try 40 grit (25-pack) sheets.
2. Progress to 60 grit. Remove the rough scratches left by coarse sanding. A good choice is 60 grit (50-pack) for consistent coverage.
3. Smooth with 100 grit. Sand evenly across the floor, blending sections together. Stock up on 100 grit (100-pack) for large projects.
4. Optional 150 grit pass. For a natural, ultra-smooth finish without stain, lightly sand with 150 grit to enhance clarity.
5. Edge sanding. Use the same grit sequence on edges and corners with an edge sander or sanding block.
6. Final cleaning. Vacuum thoroughly and wipe with tack cloth before applying stain or finish.

Special Cases

For engineered hardwood, avoid starting with very coarse grits—stick to 60 grit to protect the thinner veneer. For parquet floors, sand diagonally across the grain, then follow with finer grits along the pattern.

Pro Tips

• Sand with the grain whenever possible to avoid swirl marks.
• Replace sandpaper as soon as it clogs—dull paper burns wood.
• Overlap sanding paths slightly to maintain consistency.
• Never skip grits; each step erases the scratches from the last.

Aftercare

• Apply a sealer or polyurethane finish promptly after sanding.
• Use felt pads under furniture to prevent new scratches.
• Clean floors with a damp mop and avoid harsh chemicals.

FAQs

• Can I sand floors by hand? Only for small touch-ups—full floors require power sanders.
• How many times can hardwood be sanded? Solid hardwood can usually be sanded 4–6 times depending on thickness.
• Is sanding necessary before re-coating? Yes, lightly sand with 150 grit before applying new finish coats.

Watch & Learn

Well-sanded floors set the stage for stunning finishes. Explore our full extra coarse sandpaper collection and coarse grit sandpaper collection to get the job done right.