The cantilever design for a deck building project is a moderately challenging one that is still within the range of do it yourself skills. Building decks are one of the most popular forms of do it yourself projects, and learning this cantilever design can mean a larger deck with the same span ratio. In today's world where homeowners want bigger, multi level decks for outdoor entertaining, this cantilever design is one that is most recommended. Here are some steps to take in building your own cantilever design deck.
Step 1 - Measure for Columns
Use a tape measure and begin to mark the location for the footing columns. The cantilever design can incorporate the same number of footings of a traditional deck. Mark locations with a wooden stake or landscape paint.
Step 2 - Dig and Pour Footing Columns
One of the aspects of building a cantilever design is that the footing piers do not have to be as precise in their location. This can make the initial digging and pouring much easier and less stressful. The cantilever design is built on the fact that the joists can be extended past the footing column by 40%. This can effectually extend the deck by four feet if 2 x 10 joists are used.
Use a post hole digger to get the hole started and then complete them with a shovel. The holes should be the same diameter as the concrete tubes and to a depth of 20 inches. Cut the tubes with a circular saw to fit the length that you need. Set the tubes into the ground and make sure they are straight. Mix the concrete according to directions and pour into the tube. Level off the top and set an anchor bolt in the center.
Step 3 - Attach Posts
Once the concrete is dry, secure the post anchors to the anchor bolt by tightening a nut onto the bolt. Cut the posts to the desired length and set them in position. Secure with a carriage bolt through the post and bracket.
Step 4 - Install Ledger Beams
Attach the ledger board to the home through the use of carriage bolts. From this beam, continue to set the outer ledger beams along the perimeter of the deck. They should be centered on the footing posts, but can be to either side by an inch or so. Keep in mind you can extend the beams bast the footings by up to 40% if using 2 x 10 joists. If you are using low profile joists you will need to multiply the width of the joists by .4 to find out the total length of extension. If you do not want a bouncy deck, then keep the total extension down to about 25%.
Step 5 - Install Joists
Attach joist hangers onto the beams with wood screws. Cut the joists to fit and then install them into each of the hangers. Use wood screws to attach to the hangers.
Step 6 - Install Deck Flooring
With the joists installed, you can finish off the major portion of the deck by securing the 2 x 6 decking. Use galvanized decking screws to secure the boards for a firm floor.