How to Build a Circular Deck

Circular decks are the most popular choice when it comes to decks that are curved. These also require railings. However, most curved decks need long cantilevers. This limits the size of your circular deck.

There are easy steps on how you can make a circular deck that you can make with the simplest geometrical concepts. All you will need is a compass too – a trammel. This is available in most hardware stores.

Artistic looking irregular curves should be limited for use in low decks; the reason being the difficulty to construct these kinds of curves. Curves work well for all large decks. The amount of overhang that will be there on the cantilever is relatively short when you compare it to a circular curve.

Circular Duck1 How to Build a Circular Deck

Step 1: Begin with installing posts and beams for a cantilever deck. Slightly cut the joists longer than their intended final length. Attach them with care to both the ledger and the beam. You can then add the cross blocking between the two outside joists so you can make sure that they remain secure and plumb.

Step 2: Mark the spacing of the joist on a 1×4 brace. After that, take it across to the tops of the joists pointing to where you want the deck cover to begin. Then start measuring the basic distance between the edges inside the outer joists that are there at each side of the beam. Divide the measurement that you get in half and that will assist you to find out the radius of the circular curve.

Step 3: Build a trammel. You can do this by fastening an end of a 1×2 to the center of the curve with a long nail.

Step 4: A protractor can establish the level angles that you will be using to cut the joists. Position the squares so you can align the layout mark on the joist. Find the exact degree measurement. The end of the joist down to the pivot point will mark the area where it actually intersects the degree scale on a square.

Step 5: a combination square can then be used. Extend the cutting lines both down the front and back of the joists. Carefully mark the cutting lines. These lines will define the circular curve and make sure it touches the edges that are inside the joists.

Step 6: Carefully cut off every individual part of the joist with a circular saw. Set this at the most optimum level. Tightly clamp a straightedge to the joist. This will give you a guide for the foot of the saw. The outside of the joists can be the locations where the circular curves can begin making 90-degree incisions. With the use of a saw, you can start cutting the joists.


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