The area involves a door leading on to the deck. The floor is about 12 inches above the deck. After removing the molding, stops and threshold, we removed the styrofoam to check for rot in the wood beneath.
We found 2 8 X 10's, one behind the other, below the sill facing us and totally rotted.
They had been wrapped in black plastic. We have removed the front piece, but the second is nailed to a 2 X 2. This 2 X 2 rests upon 3 piers so is actually the rim joist and moves whenever pressure is applied to the remaining 2 X 10. We plan to slide a 8 X 10 PT board in from behind to support the floor joists. Should this board be secured to the piers in some way?
My next question involves the deck attachment. The wall of the house rests on piers, but there is a brick curtain wall in front of the piers. The ledger board is attached to this wall. Because it is necessary to have a step leading from the door to the deck. The above assembly leaves about 6 inches of solid materials underneath the steps and I do not understand how water would be able to drain. The ledger board is sound and will be flashed. New stairs will be placed 2 inches from the door. We also plan to place flashing underneath the siding at the lower edge where is meets the deck. Will this solve the problem?
BTW, this house was built in 1982.