How to repair damaged outdoor WPC decking?

Jul 31, 2025

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Hey there! I'm an outdoor WPC decking supplier, and I've seen my fair share of damaged decks over the years. WPC, or wood-plastic composite, decking is a popular choice for outdoor spaces because it's durable, low-maintenance, and looks great. But even the best decking can get damaged over time, whether it's from weather, foot traffic, or other factors. In this blog post, I'm going to share some tips on how to repair damaged outdoor WPC decking.

Assessing the Damage

The first step in repairing damaged WPC decking is to assess the extent of the damage. Minor scratches and scuffs can usually be fixed with a little bit of sanding and some touch-up paint or stain. But if the damage is more severe, such as cracks, splits, or holes, you may need to replace the damaged boards.

To assess the damage, start by walking around your deck and looking for any obvious signs of wear and tear. Pay attention to areas that get a lot of foot traffic, such as near the stairs or the entrance to your house. Look for scratches, scuffs, cracks, splits, or holes in the decking boards. You may also notice that some boards are loose or wobbly.

Once you've identified the damaged areas, take a closer look at the damage. Use a tape measure to measure the length and width of the damaged area. This will help you determine how much material you'll need to repair the damage.

Repairing Minor Damage

If the damage to your WPC decking is minor, such as scratches or scuffs, you can usually repair it yourself with a few simple tools and materials. Here's what you'll need:

  • Sandpaper (medium and fine grit)
  • Touch-up paint or stain that matches the color of your decking
  • Paintbrush or roller
  • Clean cloth

To repair minor damage, follow these steps:

  1. Sand the damaged area: Use medium-grit sandpaper to sand the damaged area until the surface is smooth. Be careful not to sand too hard, as this can damage the surrounding decking.
  2. Clean the area: Use a clean cloth to wipe away any dust or debris from the sanded area.
  3. Apply touch-up paint or stain: Use a paintbrush or roller to apply touch-up paint or stain that matches the color of your decking to the damaged area. Follow the manufacturer's instructions for applying the paint or stain.
  4. Let the paint or stain dry: Allow the touch-up paint or stain to dry completely before using your deck.

Repairing Severe Damage

If the damage to your WPC decking is more severe, such as cracks, splits, or holes, you may need to replace the damaged boards. Here's what you'll need:

  • Replacement decking boards that match the size and color of your existing decking
  • Screwdriver or drill
  • Screws or nails
  • Saw
  • Measuring tape
  • Level

To replace a damaged decking board, follow these steps:

  1. Remove the damaged board: Use a screwdriver or drill to remove the screws or nails that are holding the damaged board in place. Be careful not to damage the surrounding decking.
  2. Cut the replacement board: Use a saw to cut the replacement board to the same length and width as the damaged board. Make sure the replacement board fits snugly between the existing boards.
  3. Install the replacement board: Place the replacement board in the empty space and use a screwdriver or drill to attach it to the joists with screws or nails. Make sure the board is level and secure.
  4. Finish the edges: Use a saw to cut the edges of the replacement board to match the shape of the existing boards. Sand the edges to smooth them out.
  5. Apply touch-up paint or stain: Use a paintbrush or roller to apply touch-up paint or stain that matches the color of your decking to the replacement board. Follow the manufacturer's instructions for applying the paint or stain.
  6. Let the paint or stain dry: Allow the touch-up paint or stain to dry completely before using your deck.

Preventing Future Damage

Once you've repaired the damaged areas of your WPC decking, it's important to take steps to prevent future damage. Here are some tips to help you keep your deck looking great for years to come:

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  • Clean your deck regularly: Use a mild detergent and water to clean your deck regularly. This will help remove dirt, debris, and stains from the decking.
  • Seal your deck: Apply a sealant to your deck every year or two to protect it from the elements. This will help prevent the decking from fading, cracking, and splitting.
  • Avoid using harsh chemicals: Avoid using harsh chemicals, such as bleach or ammonia, to clean your deck. These chemicals can damage the decking and cause it to fade or discolor.
  • Use furniture pads: Use furniture pads under the legs of your outdoor furniture to prevent scratches and scuffs on the decking.
  • Trim trees and shrubs: Trim any trees or shrubs that are growing near your deck to prevent branches from falling on the decking and causing damage.

Conclusion

Repairing damaged outdoor WPC decking doesn't have to be a difficult or expensive task. With a little bit of knowledge and some basic tools and materials, you can repair minor damage yourself and replace damaged boards if necessary. By following the tips in this blog post, you can keep your deck looking great for years to come.

If you're in the market for new Outdoor WPC Decking, WPC Decking Boards, or Solid WPC Decking, I'd love to help you find the perfect product for your needs. Contact me today to learn more about our products and services and to get a free quote.

References

  • "How to Repair WPC Decking." DIY Network.
  • "WPC Decking Maintenance and Repair." Decks.com.
  • "Repairing Damaged Composite Decking." This Old House.