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A patio roof or an overhead may be attached to the house with a ledger, as shown below, or it can be free-standing, as shown at bottom. In either case, the structure is supported by a series of posts or columns, which in turn rest on a concrete slab or on piers and footings.
If you're adding an overhead to an existing deck, you can bolt the posts to the substructure of the deck, placing them directly above or adjacent to the deck posts. The posts support beams and rafters.
If the overhead is attached to the house, the ledger takes the place of a beam, supporting the rafters directly. Overhead rafters can be left open or can be covered with any one of a number of patio-roof materials.
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