I recently had a deck built on my new house. Now when it rains water enters my basement near my patio door. I've attached a picture of the area that leaks near the door and a close up of the same area.

Leaking area under door Close up of leaking area under door

There is a piece of flashing above the ledger board, but the contractor has nailed through it (I'm not sure if that matters). There is no additional flashing or tar paper behind the ledger board, just the house wrap. The flashing on top of the ledger is cut here to fit under the door and is barely higher than the deck boards.

The water problems in this area have me concerned about the quality of flashing all around the deck. The floor boards are nailed through the flashing and into the ledger board in every area. Additionally I've noticed the portion of the deck at the top of the stairs slopes towards the house.

landing sloping towards house

I really have no idea what I should do near the door. Should I pry up the deck boards and try to re-flash it. Is there an easier way to fix it? What about the rest of the flashing? Is it OK even with the deck boards nailed on through it or does it need to be replaced? How big of a deal is it that the landing above the stairs is slightly sloped towards the house?

Edit to add more information and requested pictures:

The house was built approximately one year ago. The deck was added about seven months ago by a different contractor.

Here is a picture taken from under the deck by the door.

under deck near door

And here is a picture taken from inside the basement showing where water is entering the house.

water staining inside

When I sprayed water on the deck with a hose it began to come in when I hit near the door. Although based on where the wire is in the interior picture I think it's entering to the right of the door. I wasn't spraying the walls, so I don't think it is coming in from the outlet. Maybe it's flowing along the top of the flashing and finding a hole somewhere? I'm stumped honestly and not sure of the best course of action.

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    Was the door installed at the same time as the deck or was it already there? Did the same contractor do both deck and door? Give us a time line of the events. Photos under the deck where the ledger board is attached to the house will help. More photos. – Alaska Man Oct 20 '19 at 19:05
  • Hello, and welcome to Home Improvement. Thanks for the well-stated question, but even more information would be helpful. And, you should probably take our tour so you'll know how best to participate here. – Daniel Griscom Oct 20 '19 at 19:06
  • You didn’t specify whether the door was there previously or not but we will assume that it was. It seems like the contractor you had install your deck did not do a proper job, BUT since the deck wasn’t there before it’s difficult to say whether water could get in or not. It would seem the only way to remedy the situation is remove the deck to inspect and repair. It is difficult to see what kind of flashing was done behind the ledger board. – Alaska Man Oct 20 '19 at 20:24
  • The door was already there. There is no flashing behind the ledger board. Just the house wrap. The siding starter is what is right below the deck ledger with the original flashing between the siding and stone below that. The only flashing the deck builder added is that L shaped piece of metal between the ledger and floor boards. Thanks for your quick response. Sounds like it might be a good bit of work to fix unfortunately – stf Oct 20 '19 at 20:31
  • It sounds like that deck contractor should be responsible to come back and do the job properly. Had the proper flashing been done over the ledger board and everything sealed right it would not be leaking. The deck contractor should do it right because that’s what he was paid for. – Alaska Man Oct 20 '19 at 20:43

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