Anatomy of the Wood Lattice Patio Cover

Components which make up a Simi Valley Wood Patio Cover 

  • Footings
  • Beams
  • Rafters
  • Shade bars
  • Ledgers
  • Posts
  • Hardware


The footings for the Simi Valley Wood Patio Cover are the structural component which supports the weight of the patio cover system. The footings can be as small as 12″ square or as large as 36″ square and larger. Most of the time, the footings are dug into the ground exactly where the posts are placed and filled with concrete. Rebar, which is a steel rod is not typically placed into these holes prior too filling them with concrete but can be.

Wood Lattice Patio Cover Beam

The beam is the main supporting member located at the front of the patio cover and thus the most important piece of the Wood Lattice Patio Cover system. Wood beams support the rafters and the lattice bars. Additionally, this structural component is sized specifically for each installation. Furthermore, the dimensions of the beam is determined by the length of the rafters as well as the width of the structure as a whole. Beam materials are typically constructed of Douglas Fir but can be a special structural system also known as a Glue Lam beam, made from individual wood pieces.

Wood Lattice Patio Cover Rafters

Rafters are the wood members which attach to the house and lay on top of the beam. The rafters are the component which supports the top members called the lattice or shade bars. For the most part, the rafters are sized according to the lateral spacing as well as the length, combined. Many times, the rafters can be a 2x, 4x, 6x or 8x wood member and are typically a free of heart center wood member.

Patio Cover Shade Bars

For the most part, the shade bars are the single most important component of the lattice Simi Valley Wood Patio Cover. Reason being, is that the lattice bars provide the necessary shade which i’m sure you will agree is the entire reason for a lattice shade bar patio cover in the first place. 

The Ledger

A ledger, is the point at which the patio cover will make it’s attachment to the building, respectively.  Depending on your jurisdiction, the local building authority will have their own idea as to the correct way the ledger must be attached to the building.  Many times, the ledger is attached with the use of “lag” bolts. These lag bolts will typically run through the ledger and into the interior of the house and connect into the wood framing within the building. At the point at which the ledger makes contact with the house, the top, is sealed to reduce the potential for moisture intrusion.

Lattice Patio Cover Posts

The posts of a patio cover are the vertical components which transfer the load of the roof directly into the earth. They are more or less, a very important structural component. Without the post, the cover could not stand.


When we as contractors say “hardware”, we are essentially referring to the steel pieces which make all of our connections. For example, the connection between the footing and the post, the beam and the post and the rafter to the ledger. All of these connections use to some degree, hardware. Hardware can be manufactured by many different companies but here is Southern California, Simpson is the leader in Simi Valley Wood Patio Cover hardware.