Building a Round or Curved Deck
Curved decks are interesting and unique, but they are somewhat difficult to build because deck framing materials are straight and rigid. It is always best to start with a good plan. Curved decks are easier to draw on paper than to build in the real world. You will need to use an AutoCAD program or graph paper to determine the center of the circle and the length of the radius (the distance from the center of the cirlce to any point along the edge of the circle).
In order to build a curved deck, you use a series of angled dropped beams, posts and footings to support cantilevered joists that will extend across the curved or round section of the arc. Joists are usually allowed to cantilever a beam by 2' without hiring an engineer. You can run the ends of the joists wild past the beam because you will be cutting them back all at once.
Next, you will lay out and mark the radius across the ends of your joists. You can use a deck board as a compass. Use your plan to locate the pivot position and fix your compass to the center point with a screw. Leave the screw a bit loose so the compass board can turn. If the center point lands in between joists, you will need to install cross blocking to attach the compass pivot point. Arc the compass across the front ends of the joists to mark the radius on each side of the joist with a construction pencil. Then, you will cut the joists to the proper lengths and prepare your front rim board to cover the ends of the joists against the curved section of the deck.
If the pivot point is located in the house, you will need to lay out the circle in the yard. Lay pieces of plywood along the circumference of the circle. You can trace and cut these plywood pieces into templates that you can lay out on top of the deck to trace your radius.
It is always a good idea to install blocking between joists along the curved ends of the deck. This will strengthen the frame and create a good clamping surface to bend your fascia board across the curved radius.
The rim board can be bent using kerfed cuts. This involves scoring the 2x material with a circular saw to allow it to bend across the radius. Or you can use 1/2" plywood in layers built up to 1.5" thickness.
Another method for installing a curved rim or header board is to soak strips of pressure-treated plywood in hot water for about an hour to increase its flexibility. You can then bend the pressure-treated plywood strips across the front of the joists and screw it into place.
Composite decking is flexible enough to be bent across curved sections of the deck. If the decking is hot it will be even easier to bend into the desired shapes. Fascia board is flexible and can be installed over the rim board to clean up the edges. Some composite and metal railing companies offer curved railing that can be custom ordered to match your deck's radius.
Visit our gallery for ideas. Curved Deck Pictures Here or download a free Curved Deck Plan Here
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Introduction to Decking
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Railings
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Care
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A deck extension is a great option when you feel like you need more outdoor space. Learn the step-by-step process of extending an existing deck.
Beam Span Chart
Learn how to size your deck beam using this easy-to-use span table. Just cross-reference the post spacing and joist length to determine the beam size.
What to Consider When Building A Wrap-Around Deck
Looking to add a wrap-around deck to your home but unsure of what the process involves? Check out this guide to learn more about top considerations when building a wrap-around deck.
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Building a deck can be a complicated process. Learn how to avoid falling into common deck building pitfalls with tips and advice from the experts at Decks.com.
Introduction to Decking
Spacing between deck boards provides several critical functions, such as drainage & drying. Learn how to space and stagger deck boards at Decks.com.
Explore Articles by Topic
Footings
Information related to installing frost footings for decks
Framing
Learn structural framing methods
Decking
Learn about wood and composite decking materials
Stairs
An in-depth look at the complex issue of how to build stairs
Railings
How to install guardrails and handrails to meet IRC code
Features
An overview on water drainage, benches, planters and lights
Design
The basics of deck design
Planning
Learn about permits and working with contractors
Porches & Patios
Build a covered deck to enjoy all seasons
Ledger
Proper attachment techniques
Care
Maintain your deck to maintain your investment
Materials
An overview on water drainage, benches, planters and lights