The ledger, typically a 2 by 6, is usually designed to hold one end of the patio-roof rafters. Locating and mounting the ledger is normally a fairly easy process; the ledger should be attached before the foundation is built for a deck, patio roof posts, and other structure.Click to see full answer. Similarly one may ask, what is a ledger board on a house?Ledger board is a structural member that is mounted to a vertical frame. Usually, its size is 2″ by 10″ or 2″ by 12″ piece of sturdy lumber. Also called a ribbon board or strip, ledger board is used to attach the deck to the frame of the house.Likewise, what is a roof over a deck called? One of the simplest deck covers is a pergola — a system of open rafters supported by posts. You can grow vining plants in the rafters, and hang overhead lights for evening get-togethers. Deck Roof. A full-on deck roof, often called a porch roof, uses basically the same techniques as a regular roof. Subsequently, one may also ask, how do you attach a roof to a house? Cut one side of the horizontal roof beam on an angle so that the rafters sit flush on it. Using your nail gun, attach the horizontal beam and cut the two outer rafters to sit flush on top of the existing house roof. Install the two outer rafters and attach a plain rafter beam to the very edge of the existing roof.What size is a ledger board?A 2×8 up to 12 feet; 2×10 to 15 feet and 2×12 to 18 feet. The larger the deck, the larger the joists. In typical deck construction, with a ledger on one side of the joist and beam on the other, the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above.