When it comes to deck maintenance, most homeowners focus on the surface—sweeping off leaves, scrubbing the boards, or reapplying stain. But what’s underneath your garden wood deck matters just as much. Dirt, debris, moisture, and even critters can accumulate under your deck if it's not cleaned and maintained regularly.
At Arca Construction, we believe a well-cared-for deck starts from the ground up. Here’s a step-by-step guide on how to clean under your garden wood deck—and why it’s so important to keep this often-overlooked area in check.
Why You Should Clean Under Your Deck?
Cleaning under your garden deck isn’t just about looks. It helps:
- Prevent mold and mildew caused by trapped moisture
- Discourage pests like rodents, insects, or snakes from nesting
- Protect the deck’s structure from rot and decay
- Promote airflow, which helps keep the wood dry and strong
- Avoid drainage issues that could damage your landscaping or foundation
Regular cleaning helps your deck last longer and keeps your yard healthier and safer.
Step-by-Step: How to Clean Under a Garden Wood Deck
Step 1: Clear the Deck Area
Start by removing any furniture, planters, or other items on the deck. This makes it easier to see where debris may be collecting underneath. If your deck is low to the ground, you may need to access the area from the sides or use a flashlight for visibility.
Step 2: Remove Surface Debris
Use a rake, leaf blower, or even a shop vac to remove:
- Fallen leaves
- Grass clippings
- Twigs
- Trash or windblown debris
If your deck is higher off the ground, you may be able to crawl under it carefully to rake things out manually. For low-clearance decks, use a long-handled tool or air blower to reach into tight spaces.
Step 3: Trim Nearby Vegetation
Check the perimeter of your deck. Trim back any shrubs, vines, or grass growing too close. Overgrown plants trap moisture and attract pests, so keeping a clear border around the deck helps improve airflow and visibility.
Step 4: Check for Standing Water
Look for any signs of poor drainage or puddles under the deck. These areas can lead to wood rot, especially in the support posts or joists. If water is collecting, consider:
- Adding a gravel base for drainage
- Installing drainage channels or a French drain
- Adjusting the slope of the ground to direct water away
Arca Construction can help assess and install effective solutions if water pooling is a recurring issue.
Step 5: Inspect for Mold, Rot, or Pests
While you’re under the deck, inspect the underside of the wood for:
- Discoloration or black spots (signs of mold)
- Soft or crumbly wood (possible rot)
- Chew marks or droppings (indicating rodents or insects)
If you spot structural issues, it’s best to have a professional evaluate the damage. Catching these problems early can prevent costly repairs down the line. Here's how to choose a professional deck builder.
Step 6: Optional: Install a Weed Barrier or Skirt
To keep the area clean longer, consider adding:
- A landscape fabric barrier with gravel on top to suppress weeds and improve drainage
- A deck skirt or lattice to block debris and deter animals, while still allowing ventilation
Both additions make the space look cleaner and require less maintenance over time. Read on to get landscaping ideas around the deck.
How Often Should You Clean Under Your Deck?
We recommend checking under your garden deck:
- Twice a year—once in spring and once in fall
- After storms, especially if your yard has a lot of trees
- Any time you notice pest activity or standing water
Routine cleaning and inspection can extend the life of your deck and keep your garden area safer and more enjoyable.
Need Help with Deck Maintenance?
If your deck needs more than just a cleaning, like structural repairs, water management, or even a full rebuild—Arca Construction is here to help. We specialize in wood decks that are not only beautiful but also built to stand up to the elements from top to bottom.
Contact us today or call (540) 413-4860 to schedule an inspection or maintenance consultation.
Want more deck care tips? Visit our blog or explore our full services on the Arca Construction homepage.
Let’s keep your outdoor space clean, safe, and ready for whatever the season brings.