Refinishing Wooden Stairs: Sanding for Safety and Style (60–220 Grit Guide)

Wooden stairs take a beating from daily foot traffic, leading to scratches, dents, and worn finishes. Proper sanding is the key to restoring beauty and safety before staining or painting. This guide explains the grit sequence and best techniques for stair refinishing.

Why Sand Wooden Stairs?

Sanding removes old finish, evens out wear marks, and prepares the surface for new coatings. It also improves traction by eliminating uneven surfaces that can cause slips.

Best Tools for Stair Sanding

• 9x11 in silicon carbide sandpaper sheets
• Orbital sander for large treads
• Detail sander or sanding block for edges
• Vacuum with brush attachment
• Protective mask, gloves, and goggles

Recommended Grit Sequence

• 60–80 grit: Remove old finish and rough patches.
• 120 grit: Smooth scratches left by coarse sanding.
• 180 grit: Prep wood for staining or painting.
• 220 grit: Final pass for silky-smooth finish.

Step-by-Step: Sanding Wooden Stairs

1. Prep the area. Cover surrounding floors and wear protective gear.
2. Start with coarse grit. Strip old finish with 60 Grit (25-pack) or 80 Grit (50-pack).
3. Smooth with 120 grit. Eliminate rough marks and scratches. Use 120 Grit (100-pack).
4. Refine with 180 grit. Sand along the grain for consistent texture.
5. Finish with 220 grit. Light sanding creates a smooth, paint- or stain-ready surface.
6. Vacuum thoroughly. Remove all sanding dust before applying finish.
7. Apply stain or paint. Seal with a durable polyurethane topcoat for long-lasting results.

Special Cases

For painted stairs, you may only need to scuff sand with 120 grit before repainting. For heavily damaged treads, start with 36–40 grit for faster removal.

Pro Tips

• Sand each tread evenly to avoid dips or uneven surfaces.
• Use a detail sander or hand block for corners and risers.
• Always sand with the grain to prevent scratches.
• Replace sandpaper sheets as soon as they clog for best results.

Aftercare

• Allow finishes to cure fully before walking on stairs.
• Use rugs or stair runners to protect high-traffic areas.
• Clean with mild soap and water—avoid harsh cleaners.

FAQs

• Do I need to remove all old paint? Yes, if staining. For repainting, scuff sanding may be enough.
• Can I use a belt sander? Only for large, flat treads—avoid on edges and risers.
• What grit should I stop at before staining? 180–220 grit is ideal for stain absorption.

Watch & Learn

For durable, professional stair refinishing, shop our Wood Sanding Collection.