2 Wellington Street West, Brampton, Ontario, L6W 2C4 — Is my new deck ledger flashed and fastened correctly?

Because no drawings or specific details of your deck ledger installation were provided, you will need to compare your actual installation against the following Ontario Building Code (OBC) requirements for flashing and ledger fastening:

1. Flashing Requirements

• Fastener Compatibility: Fastening devices for flashing must be corrosion-resistant. If you are using metal flashing, the fasteners must be compatible with the flashing to prevent galvanic action [1].
• Junctions: Junctions with adjacent materials (such as where the deck ledger meets the house wall) must be adequately flashed to shed water [3].
• Installation Locations: Flashing is generally required at every horizontal junction or offset in the cladding, and where cladding substrates change [2]. However, flashing is not required if the upper cladding overlaps the lower cladding by at least 25 mm, or if the cladding is installed outboard of a drained and vented air space with details designed to minimize precipitation ingress [2].

2. Ledger and Fastening Requirements

Depending on your wall type and structure, the following sizing and fastening rules apply:

• Insulating Concrete Form (ICF) Walls: If your ledger is supported on flat ICF walls, the wood ledger board must be at least 38 mm thick and at least the depth of the floor joists [4]. Anchor bolts securing the ledger to the ICF wall must be embedded to a depth of at least 100 mm and spaced in accordance with Table 9.20.17.5 [4].
• Wood Beams: If joists are framed into the side of a wood beam using ledger strips, the ledger strips must be at least 38 mm by 64 mm [9]. Alternatively, 38 mm by 38 mm ledger strips may be used if each joist is nailed to the beam with at least four 89 mm nails [9].
• Steel Beams: If joists are framed into the side of a steel beam using a wood ledger, they must be supported on at least 38 mm by 38 mm lumber bolted to the web with bolts that are at least 6.3 mm in diameter and spaced no more than 600 mm apart [9].

Note: The zoning context for 2 Wellington Street West could not be resolved, so no municipal zoning standards are evaluated here.