How to Sand Wooden Pergolas for Outdoor Refinishing (60–220 Grit)

Pergolas add style and shade to outdoor spaces, but constant sun, rain, and wind can wear down their surfaces. Sanding is the first step in restoring pergolas before staining or sealing, ensuring they look great and last longer.

Why Sand Pergolas?

Sanding removes rough patches, old finishes, and weathered layers. It prevents splinters, smooths surfaces, and helps new coatings adhere properly for outdoor protection.

Tools You’ll Need

• Orbital sander for beams and posts
• Sanding sponges for joints and corners
• Wet/dry sandpaper sheets (60–220 grit)
• Outdoor blower or vacuum
• Mask, goggles, gloves

Recommended Grit Sequence

• 60 grit: Removing old finishes and heavy weathering.
• 100 grit: General smoothing after coarse sanding.
• 150 grit: Preparing wood for stain or sealer.
• 220 grit: Final sanding for smooth, touchable surfaces.

Step-by-Step Process

1. Inspect the pergola. Check for rot, loose joints, or damaged boards before sanding.
2. Start with 60 grit. Use 60 grit (25-pack) to strip rough surfaces.
3. Refine with 100 grit. Sand beams and posts with 100 grit (100-pack) for evenness.
4. Prep with 150 grit. Use 150 grit (25-pack) to ready surfaces for stain or sealer.
5. Finish with 220 grit. Lightly sand joints and details with 220 grit (50-pack) for polished results.
6. Clean thoroughly. Blow or vacuum dust from all surfaces and corners.
7. Apply finish. Stain or seal with exterior-grade products to protect from weather.

Special Cases

For cedar or redwood pergolas, avoid over-sanding with fine grits, as it can reduce stain absorption. For painted pergolas, stripping followed by sanding may be required.

Pro Tips

• Sand with the grain for smoother results.
• Use ladders or scaffolding for safe sanding at heights.
• Seal all end grains and joints to prevent water penetration.
• Apply multiple thin coats of stain or sealer for durability.

Aftercare

• Inspect pergolas annually for peeling or fading finishes.
• Reapply protective coatings every 2–3 years.
• Clean with mild soap and water to prevent mildew.

FAQs

• Do I need to sand to bare wood? Yes, for staining. For resealing, light sanding may be enough.
• Can I sand pergolas by hand? Yes—hand sanding works well for joints and small details.
• What grit is best before sealing? 150–220 grit ensures smoothness and good absorption.

Watch & Learn

Sanding pergolas prepares them for years of outdoor beauty and protection. Stock up on extra coarse sheets, medium grits, and fine sandpapers for your next pergola refinishing project.