Building Deck Over Concrete Patio

Building a Deck Over a Concrete Patio

Transforming your concrete patio into a stylish and inviting deck is a rewarding DIY project that can dramatically enhance your outdoor living space. While the process may seem daunting at first, it's surprisingly manageable with the right planning and materials.

Before embarking on this endeavor, it's crucial to ensure that your concrete patio is structurally sound and level. Any cracks or uneven surfaces should be addressed prior to the decking installation. Additionally, consider the height of the new deck in relation to the existing patio and any potential drainage issues.

Materials Required:

Pressure-treated lumber for joists and decking
Concrete piers or footings
Lag bolts or screws
Simpson strong-ties or other joist hangers
Deck screws
Flashing tape
Level and measuring tools

Steps:

Mark the Pier Locations: Determine the spacing and locations of the concrete piers or footings based on the size of your deck and the joist spacing (typically 16 or 24 inches on center).
Install the Piers or Footings: Excavate holes for the piers or footings and fill them with concrete mix. Allow the concrete to cure completely before proceeding.
Lay the Joists: Position the pressure-treated joists on top of the piers or footings and secure them using lag bolts or screws. Ensure the joists are level and parallel.
Install the Joist Hangers: At the perimeter of the deck, install joist hangers to support the ends of the joists. These hangers provide additional stability and prevent the deck from sagging.
Install the Decking: Begin laying the pressure-treated decking perpendicular to the joists. Start by installing a starter board along the edge of the deck and secure the decking boards to the joists using deck screws. Ensure the decking is level and has minimal gaps between the boards.
Apply Flashing Tape: Install flashing tape around the perimeter of the deck, where it meets the concrete patio. This will prevent water from seeping into the joists and causing rot.
Finishing Touches: Add railings, stairs, or other decorative elements as desired. Apply a sealant or stain to the deck to protect it from the elements and enhance its appearance.

Tips:

Use pressure-treated lumber rated for outdoor use.
Space the joists on 16 or 24-inch centers for optimal support.
Ensure the piers or footings extend below the frost line in your area.
Use deck screws specifically designed for outdoor use to prevent corrosion.
Allow the deck to "weather" for a few weeks before applying a sealant or stain.

Building a deck over a concrete patio requires careful planning and attention to detail. By following these steps and using high-quality materials, you can create a beautiful and functional deck that will be the focal point of your outdoor space for years to come.