Free-Standing Decks

• Free-standing decks are the easiest to build, because you don't have to worry about constructing a header board to attach to the house, or removing any siding. Free-standing decks can be built adjacent to the house, without depending on any structural support from the building. However, additional support will be required.
  
  

Laying the Foundation

• To build your deck, you need as level a surface as possible. If you have a concrete slab to work on, that is preferable. If not, outline the site with string or pickers and remove all grass and weeds from the surface floor. Lay mulch over the space to even it out and prevent weeds from growing.
  
  Next, choose the foundation of your deck. A few choices include deck blocks, post and beam, masonry posts and concrete foundations.
  
  Deck blocks are the simplest option. To install them, first, line the deck blocks up precisely with a carpenter's level around the area of the deck. Then stack them and cement them together. Install support beams through the holes of the blocks, and secure them in place.
  
  Building a foundation of masonry posts requires digging holes for each post, then laying gravel at the bottom to secure its base. Place the posts around the deck perimeter, making sure they're level with each other. The tops should sit about 2 feet above ground.
  
  

Framing

• Use pressure-treated lumber to create the deck framework. Construct joist framing on each corner of the deck, squaring it at precise 90-degree angles. Cut the decking boards to size, and lay them in place. For more aesthetic value and structural support, stagger the boards so the seams don't line up precisely. Then, fasten the decking boards to the joists with stainless steel deck screws, spacing them about a quarter-inch apart.
  
  

Final Steps

• Check your local building codes and zoning requirements to see if guard rails will be required. Many local ordinances require rails for all decks over 18 inches above ground.
  
  Finally, stain your new deck with a high-quality stain and sturdy exterior wood sealant.