How to Build a Round Deck

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A well-constructed deck can add beauty and value to a home. While there are a number of different designs to choose from, a round deck is among the hardest to build. The most important thing to understand in building a round deck is that the central supporting pillar needs to be extremely strong, since it will support almost all the deck's weight.

Things You'll Need

  • Treated wood beams Cement and mixer Measuring tape Metal T-plates Stakes String Saw Drill Shovel
  • Make or obtain the design for your round deck. This includes size, placement, and any other design features. Mark the loactions of your central and corner beams using string and stakes.

  • Dig holes for your footing. First, dig holes that extend to solid ground or at least four feet deep with an area of at least eight square feet. The central support beam may have to be wider than the corner beam holes.

  • Place your footing. First, set your central beam, which will measure at least one inch in diameter for each foot of the final deck diameter, placing in the hole and filling around with cement. Then fill the corner holes with cement, setting a length of re-bar so that about eight inches protrude from the cement, providing a stub to support the beams. Drill a hole in the end of the beam and secure to the re-bar.

  • Secure the support frame. This will lay over the tops of the outer beams and them connect to the central beam. Before setting up the support frame you will need to cut all your wood to the proper lengths and shapes so that the pieces fit together perfectly. Use metal T-plates to fasten the wood boards together atop the support pillars.

  • Secure the flooring of your deck. Screw 2 x 4 planks over the support frame, leaving a small gap between each board. For safety, countersink your screws.

  • According to your plans, as well as the height of your deck and the slope of the ground, attach your stairs to the deck's side, placing them at six- to eight-inch vertical increments.

  • If you would like to attach railing to your deck, do so now according to your design. Your fencing rails should extend from directly above the outer support beams.

  • Coat your deck with weather-proof finish and stain according to taste. Sprinkle some sand into the finish before spreading to prevent slips in case the deck becomes wet. Allow to dry.

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