How to Build a Ground Level Deck

Step 3: Consider Ground Level Deck Ventilation

The ground under a platform deck will get wet. Sustained dampness is the enemy of a ground level deck since it will lead to mold, rot and decay. Make sure you build your deck high enough for ventilation so the ground can dry out. That way, your deck will last longer. Generally, if a deck is less than 12 inches above the ground, the perimeter of the deck must be open for free air to flow beneath the deck.

Step 4: Plan the Foundation and Leveling

You can create a simple foundation by placing concrete blocks at the deck’s corners. You can also place your structure on top of gravel for better drainage. Next, you’ll put stakes in the ground and string the perimeter using the stakes and hang a line level. Once you know your deck outline is level, you’re ready to move to the next step.

Step 5: Lay the Beams

Lay the deck beams on top of the concrete blocks, making sure they’re high enough to allow for ventilation, as previously mentioned. These beams will serve as your ground level deck framing. Next, measure diagonally and tap the beams to line them up. It’s a good idea to use temporary stretchers (a temporary wooden framework that props the beams up) to hold the beams in place. You can use pressure-treated shims below the beams, if needed, to keep them level. You may want to add additional gravel to level out the ground.

Step 6: Attach Anchors / Joists

Once your beams are level, attach angle brackets at the corners of the deck where joists and beams meet. These will add additional support at the corners of your ground level deck. Once again, use your string level to assess the evenness of your terrain and deck.

Step 7: Attach Inner Joists

Using joist hangers, fasten the joists into the beam faces at regular intervals. Make sure to use the recommended spacing from the decking manufacturer. This provides stability and gives you a good idea of how the decking will lay. If you’re planning to add steps, then consider your stair placement.

Step 8: Lay the Decking

Finally, your decking is starting to take shape and resemble the structure you’ve envisioned. Take the first length of decking and line it up with the outside edge so it’s even. Then, install your decking boards perpendicular to the joist, making sure they’re well-secured. Make sure to gap the boards appropriately for proper ventilation, checking the manufacturer’s recommendations for gapping.

Step 9: Trim the Edges

Once your decking is installed, use a circular saw to trim any overhang, making your decking neat and even. Clean up the discarded ends of wood. Now you can admire your new ground level deck.

Step 10: Add Steps or Stairs

If you want steps for your ground level deck, then you will need to decide on how many and how you’ll build them. Some deck builders add additional footings on the ground or you can hang stringers from the deck. You can attach the stringers from the platform deck joists with either metal angle brackets or 2 x 4’s.

Now that you know how to build a ground level deck, you can see more ground level deck pictures and ideas here to plan your deck. You can also find your ground level deck building materials at a local retailer or online.