How to Attach a Ledger Board to a Masonry Wall
In order to add a deck to a home that has a masonry wall, you do need to first install a ledger board. The purpose of this installation is that it will keep the addition secure to the house and keep it from moving in times of high wind. In other words the ledger board is the anchor that holds the deck to the house.
Before you start installing a ledger board to your home, make sure you check the building codes for your area and obtain any necessary municipal permits.
Step 1 – Prepare the Wall
Remove any siding that you may have covering the part of the masonry wall you want to use. Make sure there are no electrical wires, vents or taps in the way. If there are, you will have to move them to another location before you start.
Step 2 – Prepare the Ledger Board
Use board that is the same size and type as the board you plan to use in the deck. Use the longest length of board for this purpose. It is fine if you do have to cut some off one end because this is easier than having to join several small pieces. When you measure the board for the length you want, allow for an extra 1.5 inches on each side for hanging the rim joists. Place the board against the wall and mark the edges and the top so that you know where to fit the board when you are ready to install it.
Step 3- Drill the Holes for the Installation
You will likely need two helpers to hold the ends of the ledger board while you get ready to attach it to the masonry wall. Fit the board against the marks you made in Step 2 and drill two holes (one in the top and one in the bottom) that are 12 inches apart. Use a pencil to mark the location of these holes on the wall.
Step 4 – Drill the Holes in the Wall
Using a 3/8 masonry bit in the hammer drill, drill the holes through the wall in the places that you marked. The holes need to be at least three inches deep into the wall. Insert the expansion anchors into these holes so that they are flush with the wall.
Step 5 – Attach the Ledger Board to the Wall
Put the ledger board in place once more. Place washers over the holes and screw in the 5.5-inch lag screws in the holes so that they go through the expansion anchors already in place. The washers will provide protection for the board from the screw heads. Tighten all the screws in place.