With the help of a friend, position the ledger against the flashing
so the top edge is in line with its corresponding marking on the
flashing. Tack the ledger board in place for now using a 2 ½” spiral
nail. Do not pound the nail in entirely. Check for level across the
length of the ledger board.
Mark the positions where the joists will go along the ledger board.
Ideally they should be in line with the floor joists for simplicity.
Using a ½” spade bit bore at least two holes through the ledger
board, one above each other, between each joist. The number of bolts
required depends upon the expected load on the deck. Bore through the
ledger and right through the rim joist and into the blocking.
To be safe do not be afraid to put four bolts between each set of
joists. Two bolts top and bottom on the left and right side of each
Now pry the ledger board away from the flashing and check to see if
you bored through the blocking by looking from inside the basement.
If not, drill again and complete the bore. Cut a notch for any obtacles like a gas line.
Place ½” bolts into each hole in the ledger board. Use washers under
the head of each nut and ideally (but not essential) two washers on the
back side of the bolt to create small air space between the ledger and
the first flashing.
Water should never get back here but if it ever does, it has a means of egress keeping the ledger from ever rotting.
With the help of a friend re-position the ledger bo. Line up the
bolts into the holes and push them through the blocking. Screw the nuts
with washers from the basement side and tighten up the connections.