Best Sandpaper for Deck Sanding and Refinishing

Deck sanding is fundamentally different from indoor floor refinishing. Your sandpaper strategy needs to account for softer wood, weathered surfaces, and the unique challenges of exterior finishing. This guide covers exactly what grits, open vs. closed coat, and equipment choices will get your deck smooth and ready for stain or sealant.

Why Deck Sanding is Different

Decks face weathering, UV exposure, and moisture that indoor floors never encounter. Pressure-treated wood is softer than hardwood flooring. Cedar and pine—common deck materials—sand differently and dull sandpaper faster. You'll also contend with:

• Softer wood: Pressure-treated lumber and cedar load sandpaper faster
• Weathered surfaces: Gray patina, mill scale, and oxidation require aggressive starting grits
• Resin clogging: Pine and cedar release resins that build up on paper
• Grain raising: Moisture exposure swells wood fibers; you'll need a final pass to flatten them

Grit Sequences for Deck Wood

Pressure-Treated Pine (Most Common)

Pressure-treated lumber is chemically softened and splinters easily. Start coarser than you would for hardwood:

1. 60 grit: Opens the surface, removes weathering and light mill scale. One pass with a belt sander.
2. 80 grit: Removes scratches from 60 grit. Second pass with belt sander.
3. 100 grit: Final pass. Prepares surface for stain or sealant. Can use orbital sander here to avoid over-sanding.

Total passes: 3. Typical timeline: 4–6 hours for a 400 sq ft deck with rental equipment.

Cedar or Redwood

Cedar is harder than PT lumber but still softer than hardwood. The wood is beautiful when freshly sanded, but dense grain requires slightly different approach:

1. 80 grit: First pass. Cedar responds well to 80; you don't need to start at 60.
2. 100 grit: Second pass, removes 80-grit scratches.
3. 120 grit: Final pass. Cedar accepts stain better at 120 than 100.

Total passes: 3. Cedar often requires less total sanding than PT lumber.

Open Coat vs. Closed Coat Sandpaper

This choice is critical for deck sanding.

Open Coat (Recommended for Decks)

• Abrasive grit covers 50–70% of the backing; 30–50% is air space
• Resin and dust blow away more easily; sandpaper lasts longer
• Essential for PT lumber and pine, which load paper aggressively
• Slightly lower cut rate than closed coat, but dramatically less clogging

For deck work, open coat is non-negotiable. You'll change sheets less frequently and avoid the frustration of paper clogging mid-pass.

Closed Coat

• 100% grit coverage; higher cut rate
• Clogs quickly on softwoods and weathered surfaces
• Fine for hardwood floors, not suitable for decks

Belt Sander vs. Drum Sander for Deck Sanding

Belt Sander (Recommended for Decks)

• Portable and maneuverable; ideal for decks with railings, steps, or irregular shapes
• Lower pressure and speed than drum sanders; less aggressive, better for softwoods
• Easier to control grain direction and avoid over-sanding
• Rental cost: ~$30–$50/day

A 4×24 inch or 3×21 inch belt sander is standard for deck work. Make slow, overlapping passes along the grain.

Drum Sander

• Aggressive and powerful; designed for hardwood flooring
• Can gouge softwoods if operator hesitates or applies too much pressure
• Better for large, open, flat decks with no obstacles
• Overkill for most residential decks
• Rental cost: ~$60–$100/day

If you choose a drum sander, stay at 80 grit minimum and keep the machine moving steadily.

Product Recommendations

Virginia Abrasives (Best Value)

Virginia Abrasives is the industry standard for deck work. Their open-coat sheets are durable, affordable, and widely available on Amazon:

• VA 60, 80, 100 Grit (4×24" Open Coat): Perfect for belt sanders. Expect 1–2 sheets per grit for a 400 sq ft deck.
• VA 36 Grit (for aggressive weathering): If your deck is severely weathered or painted, start here instead of 60.

3M Open Coat

Slightly higher cost, excellent durability. Good alternative if VA is out of stock.

Bosch Expert

Premium option with excellent consistency. Worth the extra cost if you're a serious DIYer or rental property owner.

How Much Sandpaper Do You Need?

For a typical 400 sq ft deck with a belt sander:

• 60 grit (if starting there): 2–3 sheets
• 80 grit: 3–4 sheets
• 100 grit: 2–3 sheets
• 120 grit (cedar): 1–2 sheets

Actual consumption depends on how weathered the deck is and your technique. Overestimate slightly; unused open-coat sheets keep for years.

Key Deck Sanding Technique

• Always sand with the grain. Softwoods splinter easily; sanding cross-grain creates visible damage.
• Use light pressure. Let the belt sander do the work. Pressing hard loads paper faster and gouges softwood.
• Overlap your passes by 2–3 inches to avoid leaving striped patterns.
• Sand the edges separately by hand or with an edger after the main sanding.
• Do a final grain-raiser pass. After sanding, wet the deck lightly, let it dry for 24 hours, then give it a very light 120–150 grit pass to lay down grain whiskers before staining.

Common Mistakes to Avoid

• Starting too fine: 80 or 60 grit is not "too coarse" for a weathered deck; it's necessary.
• Using closed-coat paper: It clogs within minutes on softwoods.
• Over-sanding: Softwoods dial very quickly. Stop as soon as the surface is smooth and gray wood is removed.
• Ignoring grain direction: One cross-grain pass ruins the look.
• Skipping the final pass: Grain whiskers will telegraph through stain if you don't do a light final sand after grain raising.

Chemical vs. Mechanical Stripping

If your deck is heavily stained or coated, you might consider chemical strippers before sanding. Mechanical sanding alone won't remove thick coatings and will load sandpaper faster. Many professionals use chemical strippers for painted decks, then follow with sanding. For natural weathered decks with no coating, sanding alone is fine.

Need the full grit progression? See our sandpaper grit chart for the complete NWFA-aligned sequence with machine compatibility and sheet counts.