How to Sand Wooden Decks for Outdoor Refinishing (60–150 Grit)

Wooden decks face constant exposure to sun, rain, and foot traffic. Over time, finishes fade, boards splinter, and surfaces weather. Sanding is the essential first step before staining or sealing your deck to restore both beauty and durability.

Why Sand Decks?

Sanding removes splinters, old coatings, and raised grain from weathering. It ensures stain or sealer penetrates evenly, preventing blotchy finishes and extending deck life.

Tools You’ll Need

• Floor sander or orbital sander for large areas
• Sanding sponges for railings and edges
• Wet/dry sandpaper sheets (60–150 grit)
• Vacuum or outdoor blower
• Protective gear: mask, goggles, gloves

Recommended Grit Sequence

• 60 grit: Removing old finishes, splinters, and heavy weathering.
• 100 grit: General smoothing after coarse sanding.
• 150 grit: Preparing deck boards for stain or sealer.

Step-by-Step Process

1. Inspect the deck. Replace damaged boards and fasten loose nails or screws.
2. Start with 60 grit. Use 60 grit (25-pack) to remove old coatings and raised grain.
3. Refine with 100 grit. Smooth boards evenly using 100 grit (100-pack).
4. Finish with 150 grit. Use 150 grit (25-pack) for stain-ready surfaces.
5. Clean thoroughly. Sweep or blow off sanding dust, then wipe surfaces if needed.
6. Apply finish. Stain or seal with exterior-grade products for maximum protection.

Special Cases

For softwoods like pine, avoid sanding finer than 150 grit—too smooth a surface can prevent stain absorption. For hardwood decks, sanding up to 180 grit may be beneficial for a polished look.

Pro Tips

• Sand with the grain of the wood for smoother results.
• Work in dry conditions to avoid trapping moisture.
• Seal cut ends of boards to prevent water damage.
• Apply stain or sealer within 48 hours after sanding for best absorption.

Aftercare

• Clean decks regularly with mild soap and water.
• Reapply sealer every 2–3 years depending on exposure.
• Use outdoor rugs or mats to protect high-traffic areas.

FAQs

• Do I need to sand to bare wood? Yes, for staining. For sealing, light sanding may be enough.
• Can I sand decks by hand? Yes—but for large areas, a floor sander is much faster.
• What grit is best before staining? 100–150 grit provides good absorption and smoothness.

Watch & Learn

Sanding decks ensures long-lasting protection and beauty. Stock up on extra coarse sheets, medium grits, and fine sandpapers to complete your next deck refinishing project.