So, we just recently had some rain and I noticed a water spot inside our house, it's on the ceiling a couple feet in from the lower sliding glass door, right below the deck. Originally I thought it was a plumbing problem, but ever since the rain changed to ice/snow, the water stopped. During the rain, when I looked outside at the deck, the ledger was wet between the house and the ledger, but dry on the side exposed. This lead me to find out that there was no flashing on top of the ledger and water was just running down the side of my house and between the ledger and the house. Imagine here http://i.imgur.com/nD6eOrM.jpg
My situation. I can easily access the top of the ledger by removing 1 board. The ledger is either lag bolted or lag screwed into the house. There is no flashing and no gap between the house and the ledger. The deck is not free standing, the lag bolts(screws) are holding up the end attached to the house. The back of my house is flat wood siding, so the deck is just pressed up against it, so I have no siding to put flashing under.
So my questions are.
1) I want to install an air gap between the house and the ledger to that it can dry out. My thought was to loosen up all the lag bolts(screws) and pry the deck away from the house. I would then slide in 2 washers between the house and the ledger that the bolts would go back though. Is this a good idea to do?
2) I would do this along with step 1 if appropriate. I want to take out the lag bolts(hopefully screws because I don't really have access to them inside), and fill the screw hole with caulk to prevent water from entering where the lag bolt is. Is this a good idea?
3) I want to install flashing on top of the ledger. My idea was to take off the top board of the deck, get flashing and make it fit, then drill holes into the flashing to attach it to the house. I would caulk between the flashing and the house and screw the flashing into the house and put the decking board back on, possibly even caulking between the top decking board in the house. This feels like a definitely need to be done thing and would be fairly easy to do.
Any advice, tips, tricks would be helpful. I want to get this done before it rains a ton, but I need it to warm up for the caulk to take hold. Also, should I hire this out? If so, how much can I expect it to cost?