How to Sand Wood Floors Before Refinishing: Smooth, Even Results (36–220 Grit Guide)

Refinishing wood floors starts with thorough sanding. This process removes old finishes, levels uneven boards, and prepares the surface for stain or polyurethane. Using the correct grit sequence is essential for a flawless, long-lasting result.

Why Sand Wood Floors?

Sanding erases scratches, stains, and surface damage while creating a uniform surface for finishing. Skipping grits or rushing the process can leave swirl marks and uneven color absorption.

Tools & Materials

• Drum sander for main areas
• Edger sander for corners and edges
• Vacuum and tack cloth
• Wet/dry sandpaper sheets
• Dust mask, ear protection, safety glasses

Recommended Grit Sequence

• 36 grit: Heavy removal of old finish and leveling boards.
• 60 grit: Removing deep scratches and refining the surface.
• 120 grit: Pre-finishing smoothness.
• 220 grit: Final pass before staining or sealing.

Step-by-Step: Sanding Wood Floors

1. Prepare the room. Remove all furniture, cover vents, and clean the floor thoroughly.
2. Coarse sanding. Start with 60 grit (25-pack) after the initial 36 grit pass to remove remaining finish and smooth out roughness.
3. Mid-grit sanding. Use 120 grit (50-pack) to refine the surface and prepare for fine sanding.
4. Final sanding. Finish with 220 grit (100-pack) for a smooth, even texture ready for finishing.
5. Edge sanding. Match grit progression on edges using an edger sander or sanding block.
6. Clean thoroughly. Vacuum and wipe with a tack cloth to remove dust before applying finish.
7. Stain or seal. Apply stain or polyurethane according to manufacturer’s instructions.

Special Cases

For engineered hardwood, start with 120 grit to avoid sanding through the veneer.

Pro Tips

• Always sand in the direction of the wood grain to minimize scratches.
• Change sandpaper frequently to maintain cutting efficiency.
• Inspect the floor under bright light before finishing.

Aftercare

• Allow finish to cure fully before placing furniture back.
• Use felt pads under furniture legs to prevent scratches.

FAQs

• Can I skip the 36 grit step? Only if the floor is already in good condition and doesn’t need heavy material removal.
• Do I need to sand between coats of finish? Yes—lightly with 220 grit for optimal adhesion.

Watch & Learn

For professional floor refinishing results, stock up on the right grits. Shop all wet/dry sandpaper sheets today.