Trying to build a deck. I looked in the basement of my house. My house
appears to be built without a rim joist. There is just wood i-beams
that sit on top of the foundation. Then plywood on the outside of the
house. How do I secure a ledger board?

The building code doesn't seem to allow a free standing deck because
the posts need to be 4 foot from the house.

I've read something about blocking but I've been unable to find a
detailed description of how to accomplish this.