Keep Your Composite Deck in Top Shape

Many homeowners prefer composite decking over wood because of its low maintenance requirements. You’ll never need to sand, stain or seal a composite deck. Like any other outdoor structure, however, it will be exposed to dirt, leaves and other debris from your yard. Keep your composite deck looking its best with these simple cleaning tips:

Sweeping. By regularly sweeping your deck clear of dirt, leaves and other organic matter, you’ll reduce the likelihood of tough stains and help prevent mold or mildew growth. It is especially important not to allow damp leaves to remain on your deck, as they can discolor the boards.

Hosing. It is recommended that you wash your composite deck at least twice a year to prevent buildup. Dirt and grime can usually be removed with a deck brush or a high-pressure water hose. For extra firepower, use a deck cleaner that contains oxalic acid, which will remove tannin stains caused by organic debris. If you use a power washer on your deck, keep it on a gentle setting to avoid causing damage.

Removing mold or mildew. Although some composite decks contain mold inhibitors, mold or mildew can still grow on the surface of your deck—particularly in areas that remain shaded or damp. It’s important to tackle such growth as soon as you notice it. Use a deck cleaner with sodium hypochlorite.

Cleaning spills. Clean up all food spills as soon as possible. In some cases, your warranty may require you to attend to stains within a certain time period. Rinse the surface with a hose and apply warm, soapy water with a stiff-bristle brush.

Removing snow. To avoid gouging the surface of your deck, use a plastic or plastic-tipped snow shovel. Alternatively, you can apply calcium chloride or rock salt to your deck to melt away the snow, but you’ll need to rinse your deck periodically to avoid residue buildup.

Use protection. Place a protective mat under your grill to prevent grease stains on your deck. Be cautious about what types of materials remain in direct contact with your deck. For example, it’s a good idea to keep potted plants raised so moisture doesn’t pool beneath them.

Don’t void your warranty. In some cases, pressure washing, sanding or other improper maintenance can void the warranty on your deck. Check with your contractor or manufacturer to make sure you understand what not to do.