What is the recommended method for attaching a patio ledger board?

The recommended method for attaching a patio ledger board is using lag bolts. Lag bolts are heavy-duty fasteners that provide a strong and secure connection when fastening a ledger board to a structural element, such as the rim joist of a house. Their design allows them to bear significant loads, which is crucial for ensuring the stability and safety of the patio structure that will be supported by the ledger.

Lag bolts are generally preferred over other fastening methods because they provide better shear strength, making them suitable for outdoor applications where the connection must withstand various environmental stresses and the weight of the patio itself. Additionally, when properly installed, lag bolts can help prevent issues such as movement or separation of the ledger board from the house over time.

While lag screws might seem similar, the distinction is important; lag bolts specifically refer to the style with a hex or square head designed for driving into wood or other materials, while screws typically have different applications and may not provide the same level of load-bearing capacity as lag bolts. The other choices, such as 1/2 inch diameter wood screws, would not be as effective for this application due to their tendency to pull out under load compared to lag bolts.