How to Sand Hardwood Floors Before Refinishing (60, 100, 180, 220 Grit Step-by-Step Guide)

Refinishing hardwood floors can completely transform the look of a home, but the most important part of the process happens before the first coat of stain or finish is ever applied. Sanding is what levels worn areas, removes old finish, and prepares the wood for a flawless new surface. Without proper sanding, even the best finish will look uneven and wear prematurely. In this guide, we’ll cover how to sand hardwood floors correctly using 60, 100, 180, and 220 grit sandpaper to achieve a smooth, finish-ready result.

Why Sanding Hardwood Floors Is Essential

Hardwood floors take years of abuse from foot traffic, furniture, and spills. Over time, the protective finish wears off, scratches dig in, and boards can become uneven. Sanding removes these imperfections and restores the surface to bare, smooth wood. This allows new finish to bond properly and ensures it will last for years.

Benefits of proper sanding include:

• Scratch removal: Deep and surface-level scratches disappear after progressive sanding.
• Even surface: Sanding levels boards and removes ridges caused by wear.
• Better stain absorption: Freshly sanded wood accepts stain evenly, avoiding blotches.
• Durability: Finish adheres stronger and lasts longer on properly sanded floors.

Understanding the Grit Sequence

• 60 grit: Heavy-duty grit for removing old finish, paint, or deep scratches.
• 100 grit: Refines scratches left by 60 grit and levels the floor.
• 180 grit: Smooths the surface and preps for stain.
• 220 grit: Provides a silky, finish-ready surface.

Tools and Materials You’ll Need

• Drum sander: For sanding large, flat floor areas efficiently.
• Edger sander: For sanding along walls and tight spaces.
• Orbital sander: For blending and finishing passes.
• Vacuum and tack cloth: To remove dust between sanding stages.
• Protective gear: Wear ear protection, a dust mask, and goggles.

Step-by-Step Process

1. Start with 60 grit. Use 60 grit (25-pack) to remove old finish, scratches, and dents. Work with a drum sander in straight lines following the wood grain.
2. Refine with 100 grit. Switch to 100 grit (50-pack) to eliminate 60-grit scratches and begin evening out the wood surface.
3. Smooth with 180 grit. Apply 180 grit (25-pack) to refine the surface further. This step prepares the floor for staining or sealing.
4. Finish with 220 grit. Use 220 grit (100-pack) for the final sanding pass. This ensures a silky, finish-ready surface that will accept stain or clear coat evenly.

Special Considerations

Parquet floors: Sand diagonally across the grain with coarser grits, then finish with the grain using finer grits.

Engineered hardwood: Be careful not to oversand through the thin veneer. Start at 100 grit if only light refinishing is needed.

Pet stains or deep discoloration: Sand with 60 grit longer, but recognize that some deep stains may never fully disappear.

Pro Tips

• Always keep the sander moving—pausing in one spot will create dips.
• Empty vacuum bags often to maintain dust control and suction.
• Overlap sanding passes slightly to avoid lines between rows.
• Check progress under strong light to spot imperfections early.
• After final sanding, vacuum and tack thoroughly before applying finish.

Aftercare

• Apply stain or sealer immediately after sanding to avoid dust settling back in.
• Use a quality polyurethane or oil-based finish for durability.
• Lightly scuff sand with 220 grit between coats for a smooth finish.

FAQs

• Do I always need to start with 60 grit? Only if the floor has old finish or deep scratches. For lightly worn floors, you can begin with 100 grit.
• Can I skip 180 grit? Skipping 180 grit risks visible scratches. It’s best to include it for professional results.
• Is dust harmful? Yes—always wear a dust mask or respirator when sanding floors.
• Will sanding fix uneven boards? Sanding can level minor unevenness, but warped boards may require repair or replacement.

Watch & Learn

Shop floor sanding sheets: Get 60, 100, 180, and 220 grit sandpaper in convenient packs. Shop floor sanding sandpaper.

Closing Thoughts

Sanding is the foundation of successful hardwood floor refinishing. By moving through 60 → 100 → 180 → 220 grits, you restore the wood to a smooth, bare state ready for stain or finish. Though the process takes time and effort, it rewards you with beautiful, durable floors that look brand new. With patience and the right grit sequence, anyone can achieve professional results.