How to Sand a Deck? 7 Steps Complete Guide for Washington Homeowners
Wood decks add beauty and functionality to outdoor spaces, but constant exposure to Washington’s rain, moisture, and UV rays can wear them down over time. Boards become splintered, gray, and rough. Learning how to sand a deck properly is one of the most effective ways to revive it and prepare it for staining or sealing.
If you are a homeowner in Pierce or Kitsap County, this guide from Northwest Decks will walk you through the sanding process safely, efficiently, and like a pro. Knowing how to sand a deck the right way will help you restore its smoothness and protect it from future damage.
Why Sanding a Deck Matters
Sanding your deck is more than just an aesthetic upgrade. It plays a vital role in long-term maintenance:
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Smooths the deck surface: Removes splinters, rough patches, and raised grain for a safer, more comfortable space.
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Improves adhesion: Opens the wood’s pores so stains and sealers penetrate deeper for lasting protection.
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Extends lifespan: Protects against Washington’s heavy rainfall and intense UV exposure by ensuring finishes adhere properly.
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Prepares for refinishing: Creates a clean, even base before applying any new finish.
Tools and Materials You Will Need
Before you begin, gather the right tools to make sanding more efficient and safe.
Power Tools:
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Orbital or belt sander (for large flat deck boards)
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Detail or corner sander (optional for railings and edges)
Hand Tools:
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Sanding block for edges and corners
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Hammer or screwdriver for tightening fasteners
Abrasives:
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60–80 grit sandpaper (initial pass to remove old finish and roughness)
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100–120 grit sandpaper (final pass for smoother finish)
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Sanding belts or sanding discs for power sanders
Safety and Prep:
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Dust mask or respirator
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Safety goggles and hearing protection
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Broom or shop vacuum
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Deck cleaner or pressure washer
Step-by-Step: How to Sand a Deck
1. Clean the Deck Thoroughly
Sanding dirty wood clogs your sandpaper and damages the deck surface.
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Wash the deck using a pressure washer on a low setting or a deck cleaning solution.
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Let the deck dry completely for at least 24–48 hours. Moist wood will not sand properly and can gum up your sanding belts or sanding discs.
2. Inspect and Repair the Deck
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Check for loose deck boards, nails, or screws and secure them to prevent damaging your sander.
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Replace rotten or severely cracked boards before sanding.
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Ensure all fasteners are recessed below the wood surface to avoid damaging sandpaper or power tools.
3. Choose the Right Sandpaper Grit
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Begin with 60–80 grit to strip old finishes and smooth raised grain.
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Follow with 100–120 grit to create a smoother finish ready for stain.
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Avoid sanding finer than 120 grit because it can seal the pores and prevent stain from soaking in.
Sanding the Deck Surface
4. Sand the Deck Boards
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Use an orbital or belt sander for the main deck boards.
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Always sand with the wood grain to prevent scratches and swirl marks.
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Keep the sander moving at a steady pace to avoid gouges.
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Work in small sections (3–4 boards at a time) for even results.
5. Sand Edges, Railings, and Stairs
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Use a handheld sanding block for hand sanding railings, steps, edges, and corners.
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Focus on tops and sides of railings where people rest their hands.
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Lightly round off sharp edges to reduce splintering and create a smooth finish.
Post-Sanding Cleanup and Preparation
6. Clean Away Dust
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Sweep or vacuum the deck thoroughly to remove sanding dust.
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Wipe down with a damp cloth or tack cloth to remove fine particles.
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This step is crucial: leftover debris can prevent stain or sealer from adhering properly.
7. Apply Stain or Sealant
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Choose a high-quality deck stain or sealer formulated for Washington’s wet climate.
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Apply using brushes, a roller, or a sprayer following manufacturer instructions.
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Allow full drying time before walking on the deck or moving outdoor furniture back.
Pro Tips for Sanding Success
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Pick the right day: Aim for mild, dry weather with no rain forecast for 48 hours.
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Prioritize safety: Always wear protective gear and keep children and pets away from the work area.
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Test first: Try sanding a small hidden section to check how the wood reacts.
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Maintain regularly: Plan to sand and reseal every 2–3 years for maximum deck longevity.
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Avoid pressure sanding: Let the power sander do the work. Pressing too hard can damage the deck surface.
Common Sanding Mistakes to Avoid
Even experienced DIYers can make these errors. Avoid them for the best results:
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Skipping cleaning: Dirt and mildew will clog your sanding belts and ruin the finish.
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Over-sanding: Makes wood too smooth, preventing stain absorption.
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Using fine sandpaper only: You need coarse sandpaper grit to remove old finishes first.
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Sanding across the grain: Creates swirl marks that show through the stain.
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Not checking fasteners: Exposed nails or screws can shred sanding discs and damage your power tools.
Deck Sanding FAQs for Washington Homeowners
How often should I sand my deck in Washington?
Every 2 to 3 years is typical, especially after harsh winters or wet seasons that wear down the deck surface. If you are unsure how to sand a deck after seasonal damage, start with a test section first.
Can I sand a pressure-treated wood deck?
Yes, just make sure the wood is fully dry (at least 6 months after installation) to avoid clogging your sanding discs and sandpaper grit.
Should I use a belt sander or orbital sander?
Belt sanders are more aggressive and remove material quickly, ideal for very rough patches.
Orbital sanders are easier to control and better for general smoothing during the sanding process.
Trust the Experts at Northwest Decks
Sanding your deck yourself can save money, but it requires time, patience, and the right sanding process. If you would rather skip the hassle and guarantee a professional finish, Northwest Decks is here to help.
We specialize in deck restoration, maintenance, and upgrades across Pierce County and Kitsap County, including cities like Tacoma, Federal Way, Lakewood, Silverdale, Bainbridge Island, Poulsbo, Kingston, Belfair, Gig Harbor, Port Orchard, and Bremerton. Our team brings the tools, power equipment, and craftsmanship to make your deck look brand new and last for years.
Whether you need complete deck sanding, refinishing, staining, or board repairs, you can count on us for reliable and friendly service. We understand the challenges of Washington’s wet climate and tailor our sanding process to protect your outdoor space from the elements.
Contact Northwest Decks today at 253.342.4688 to schedule your deck sanding or refinishing project. Let our professionals handle the hard work so you can simply enjoy a beautiful, smooth, and long-lasting wood deck for years to come.
