I am planning on adding a deck to my house and have found something interesting I do not quite understand.
I have a concrete foundation about 10" above ground and then a transition to a brick. My Ledger board should cover about 4 inches of the concrete and 6" of the brick. I drilled a pilot hole through the brick, and am able to hit the air gap and then get to my house joist. The odd thing is there is about a 3" air gap. I am assuming this is for the 2x4 framing. I have seen posts where people are using a carriage bolt assembly to connect through the house joist, but will I be ok to use a 1/2" diameter by 10" carriage bolt. I am thinking 10" because I have the 2x10 ledger, 2 1/2 " thick brick, 3" air gap, and 2x10 house joist giving about 2 inches for the washer and nut.
I also based on spacing requirements of joist connections would like a 4" anchor bolt on the concrete.
Please comment on this will give the structural stability I need for the ledger.