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Decking in a house is a wooden platform that extends from the main building and provides an outdoor living space. Decking can be built over uneven or sloped terrain that would otherwise be wasted. Decking can also enhance the appearance and value of a house. Decking requires a sturdy and secure attachment to the house using a ledger board, flashing, and fasteners. Decking also needs a railing around the perimeter for safety and stairs for access from the ground level.