Composite decking is a popular choice for homeowners because it combines the natural look of wood with the durability and low-maintenance benefits of plastic. Unlike traditional wood, composite decks resist fading, staining, and rotting, making them a great investment. However, to ensure your composite decking stays in excellent condition for years to come, regular maintenance is still necessary. In this guide, we’ll provide you with the best maintenance tips for composite decking to keep it looking fresh and functional.
1. Regular Cleaning
One of the easiest and most effective ways to maintain your composite deck is by cleaning it regularly. Dirt, leaves, and debris can accumulate on the surface and cause damage over time.
- How to Clean: Use a broom to sweep away loose dirt and debris. For a deeper clean, mix mild dish soap with warm water and scrub the surface using a soft-bristled brush or a mop. Rinse thoroughly with water to remove any soap residue.
- Avoid Harsh Chemicals: Stay away from harsh cleaners, such as bleach or ammonia, as these can damage the surface of your composite decking.
Regular cleaning not only keeps your deck looking good but also prevents dirt and grime buildup that can cause long-term damage.

2. Remove Stains Quickly
While composite decking is stain-resistant, spills and stains can still occur. The key is to clean them up as soon as possible to avoid permanent marks.
- For Food and Beverage Stains: Wipe up spills from food, beverages, or oils as quickly as possible. For stubborn stains, use a composite deck cleaner recommended by the manufacturer or a mild soap solution. Gently scrub the area with a soft brush.
- For Grease and Oil Stains: If you have grease or oil stains, apply a degreaser specifically made for composite decking. Follow the manufacturer’s directions carefully.
The quicker you clean up spills, the easier it will be to maintain the beauty of your deck.
3. Power Washing (Occasionally)
Occasional power washing can help remove dirt and stains that regular cleaning might not tackle. However, it’s important to use the right pressure and technique to avoid damaging the deck’s surface.
- Set Pressure Low: Use a pressure washer with a setting of no more than 1,500 psi to avoid damaging the decking material.
- Use a Wide-Angle Nozzle: This will allow the water to spread out and prevent the high pressure from wearing down the surface.
- Keep the Wand Moving: Never hold the wand in one spot for too long, as it can cause damage. Move the wand continuously while cleaning.
Power washing is a great way to refresh your deck but should be done sparingly to avoid unnecessary wear.
4. Trim Overhanging Branches
Overhanging branches from nearby trees can cause problems for your composite deck. Falling leaves, twigs, and even sap can leave stains or create buildup on the deck’s surface.
- Trim Branches Regularly: Keep tree branches trimmed and away from your deck to prevent debris from accumulating. This will also help prevent mold growth and staining caused by sap.
- Clean Fallen Leaves: Regularly remove leaves from the deck to prevent moisture buildup, which can promote mold and mildew growth.
By keeping your deck clear of tree debris, you’ll minimize the risk of staining and make cleaning easier.
5. Protect Against Scratches and Scrapes
Although composite decking is durable, it’s not completely scratch-proof. To prevent damage to the surface, take a few precautions.
- Use Furniture Pads: Always place pads or coasters under furniture legs to prevent scratches when moving furniture. Outdoor furniture with metal or sharp edges can easily cause scratches on composite surfaces.
- Avoid Heavy Equipment: If you’re moving heavy items like grills or planters, use a dolly or lift the items carefully instead of dragging them across the deck.
- Be Careful with Grills: The heat from a grill or fire pit can cause discoloration or damage to the decking. Make sure to place grills on a mat or pad to protect the surface.
Taking steps to prevent scratches will keep your composite decking looking smooth and beautiful for years.
6. Maintain the Gaps Between Deck Boards
Composite decking has small gaps between the boards to allow for water drainage and airflow. Over time, dirt and debris can get trapped in these gaps, leading to potential moisture buildup and mold growth.
- Clean the Gaps Regularly: Use a leaf blower, small broom, or a special tool designed for cleaning deck gaps to remove debris that may have collected between the boards.
- Check Drainage: Ensure that the gaps allow for proper water drainage, especially after heavy rain or snow. Poor drainage can lead to water pooling, which can cause discoloration or mold.
By maintaining the gaps, you’ll help ensure that your deck remains dry and well-ventilated.
7. Seal the Deck When Needed
Although composite decking is low-maintenance, sealing can help extend its life, especially in areas with extreme weather conditions.
- Follow Manufacturer’s Recommendations: Some composite decking materials may benefit from an occasional sealant. Check the manufacturer’s guidelines to determine if sealing is necessary for your specific deck material.
- Use the Right Sealant: If sealing is recommended, choose a product specifically designed for composite decks. Never use wax-based or oil-based sealants, as they can cause the surface to become slippery or sticky.
Sealing can provide additional protection against the elements, but it’s important to use the correct product.
8. Inspect the Deck Regularly
Routine inspections will help you identify and address any issues before they become major problems.
- Check for Loose Boards or Fasteners: Periodically check the boards for any signs of loosening or movement. Tighten any screws or fasteners as needed to keep the deck secure.
- Look for Wear and Tear: Inspect the deck for any visible signs of damage, such as fading, mold, or warping. If you notice any issues, take action quickly to prevent further damage.
Regular inspections are crucial for ensuring the structural integrity and longevity of your composite deck.
9. Winterize Your Deck
In colder climates, winter weather can be tough on outdoor spaces, including composite decks. Proper winterizing will help protect your deck from the effects of snow and ice.
- Clear Snow and Ice Promptly: Remove snow and ice from your deck to prevent damage from the weight and moisture. Use a plastic shovel to avoid scratching the surface.
- Avoid Ice Melt Products: Don’t use rock salt or harsh chemicals to melt ice on composite decking, as they can damage the surface. Instead, use a non-abrasive ice melt product that is safe for decking materials.
By preparing your deck for winter, you’ll ensure that it survives the cold weather and remains in great condition.
10. Fix Any Damage Immediately
If you notice any damage to your composite deck, such as cracks, scratches, or stains, take action immediately. The longer you wait, the more difficult it may be to repair.
- Repair Scratches and Scuffs: Use a composite deck repair kit to fix minor scratches or surface imperfections. For larger damages, consult the manufacturer’s guidelines or a professional for repairs.
- Replace Damaged Boards: If a board becomes severely damaged or discolored, it’s best to replace it. Composite decking is designed to be easy to repair, so replacing a damaged board is a relatively simple task.
Addressing damage right away helps prevent further deterioration and ensures your deck remains functional and beautiful.
Conclusion
Composite decking is a low-maintenance option, but regular care is still essential for keeping it in top condition. By following these maintenance tips—such as regular cleaning, removing stains quickly, protecting against scratches, and inspecting the deck—you can extend the life of your composite deck and enjoy it for years to come. With a little care and attention, your composite deck will continue to be a beautiful and functional outdoor space for relaxing and entertaining.