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Old 06-18-2009, 07:51 PM   #1
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Water leaking into basement through deck


I just bought this house and we had a lot of rain today. We are getting a little water in the basement and I saw it's coming in through the top of the foundation wall and is even getting the floor joists wet.
I checked outside and found that the water seems to be coming in where the deck mounts to the outside wall. I have attached a couple of photos. As you can see, there is flashing at the top of the ledger board but there is no flashing underneath, and there is a gap between the ledger board and the top of the foundation with foam board exposed. Is there a simple way to fix this? Can I just caulk on the top side between the first deck board and the sliding door / siding?

Thanks!
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Water leaking into basement through deck-dsc01122-large-.jpg   Water leaking into basement through deck-dsc01121-large-.jpg  

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Old 06-18-2009, 08:19 PM   #2
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Water leaking into basement through deck


No, you can't just caulk it to fix it.
Can you take a few more shots, back a little so you can see the joist/ledger relationship. It seems odd that the joist sits so much higher then the ledger. Also take some photos of the interior where the water is coming into the basement wall.
The flashing that goes behind the ledger ,should go over the top and slightly shoot out over the top so the water keeps away from the wood.
Ron

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Old 06-18-2009, 09:01 PM   #3
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Water leaking into basement through deck


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No, you can't just caulk it to fix it.
Can you take a few more shots, back a little so you can see the joist/ledger relationship. It seems odd that the joist sits so much higher then the ledger. Also take some photos of the interior where the water is coming into the basement wall.
The flashing that goes behind the ledger ,should go over the top and slightly shoot out over the top so the water keeps away from the wood.
Ron
Ron,
Here are a few more. 1118 & 1120 show the interior. Notice in 1127 the flashing going under the first deck board and 1126 is panned out a bit to show more from under the deck. Thanks for your quick reply!
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Water leaking into basement through deck-dsc01118-medium-.jpg   Water leaking into basement through deck-dsc01120-large-.jpg   Water leaking into basement through deck-dsc01125-medium-.jpg   Water leaking into basement through deck-dsc01126-medium-.jpg   Water leaking into basement through deck-dsc01127-large-.jpg  

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Old 06-18-2009, 09:05 PM   #4
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Water leaking into basement through deck


Ron,
One more thing. What you're seeing in the photo behind and extending below the ledger board is foam board not flashing. The only flashing I can see is up at the top. Maybe stuffing some flashing strip between the ledger board and the foam board so that the flashing extends beyond the top of the foundation wall? Of course that would only help if water is not running behind the ledger. Just thinking out loud.
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Old 06-18-2009, 10:35 PM   #5
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Water leaking into basement through deck


You would need to remove the deck board closest to the house. Install a "Z" flashing that would go up under the siding, lay on the ledger and drop down on the face of the ledger. The last 1/4" would kick out so the water would drip away from the wood ledger.
Then reinstall the deck board. Don't put any holes in the flashing.
Ron
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Old 06-18-2009, 10:44 PM   #6
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Water leaking into basement through deck


Sounds good. Should I be concerned with the exposed foam board? The bottom of the foam is about flush with the top of the foundation wall.
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Old 06-19-2009, 08:19 AM   #7
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Water leaking into basement through deck


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Sounds good. Should I be concerned with the exposed foam board? The bottom of the foam is about flush with the top of the foundation wall.
The foamboard should not be behind the ledger as it creates a non solid space. The ledger cannot be secured against the house with the foam behind it. It creates a sort of shear plane where the weight of the deck can/will drop the ledger down due to the space.
Ron
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Old 06-19-2009, 10:27 AM   #8
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Water leaking into basement through deck


Is that flashing in the red circle? It looks like there is already flashing installed. The two joist on either end do not hang from the ledger but are installed at the ends of the ledger. So they cut the flashing and folded it on top of the joist. Not a perfect install, but it should be somewhat functional. I am curious if the flashing goes up behind the siding.
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Water leaking into basement through deck-deck1.jpg   Water leaking into basement through deck-deck3.jpg  
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Old 06-19-2009, 03:47 PM   #9
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Water leaking into basement through deck


Yes that is flashing you circled but I don't think it goes up behind the siding. If it ever quits raining long enough I will pull up the first board and assess the situation.

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Old 06-13-2012, 02:19 PM   #10
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Water leaking into basement through deck


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Yes that is flashing you circled but I don't think it goes up behind the siding. If it ever quits raining long enough I will pull up the first board and assess the situation.

Thanks
Hi you ever find out what the issue was?
Thanks
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Old 06-13-2012, 02:53 PM   #11
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Water leaking into basement through deck


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Hi you ever find out what the issue was?
Thanks
Unfortunately not. I tried pulling the first deck board out but it wouldn't budge. My guess is perhaps construction adhesive or something like that was used where the first board slips under the sliding glass door. I had a guy come look at it and he couldn't get it out either (without committing to a demolition project). He noticed the J channel above my sliding glass door wasn't done right so he fixed that. He thought that combined with the fact that the sheathing is foam board and not OSB or plywood was causing water to get in around the flange of the sliding door. None of that fixed it. Thankfully, the last few years have not been overly wet. Otherwise I would be in bad shape.
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Old 06-13-2012, 04:10 PM   #12
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Water leaking into basement through deck


if the deck board wil not come up check for screws that have missing heads. sometimes deck screws, when set with a screw gun, pop the heads off and the body still holds the boards down. You may have to get rough with it to remove it.

I just noticed something in the last picture in post 3. Is that metal flashing I see poking out under the deck board near the spindle. If so, something is definatly goofy with the flashing

Last edited by danpik; 06-13-2012 at 04:12 PM.
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Old 06-13-2012, 04:31 PM   #13
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Water leaking into basement through deck


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if the deck board wil not come up check for screws that have missing heads. sometimes deck screws, when set with a screw gun, pop the heads off and the body still holds the boards down. You may have to get rough with it to remove it.

I just noticed something in the last picture in post 3. Is that metal flashing I see poking out under the deck board near the spindle. If so, something is definatly goofy with the flashing
I thought of that too. I verified I had all the screws out that were visible. That said, part of that first board is set back under the threshold of the sliding door and under the siding J channel on either side of the door. My only option then would be pulling the door to see what's under it.

Yes, that is flashing sticking out under the deck board.

Last edited by john8791; 06-13-2012 at 04:33 PM. Reason: more info
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Old 06-14-2012, 05:58 AM   #14
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Water leaking into basement through deck


I doubt you will have to pull the door right now, hopefully never. However, vinyl siding is easy to remove and replace. It may be time to pull the piece covering the area just above the deck to see if the flashing comes up the wall
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Old 06-14-2012, 06:31 AM   #15
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Water leaking into basement through deck


I saw leaks like this on buildings in a condo project. The problem was the nails / screws in the board against the wall were angled toward the wall missing the ledger and puncturing the flashing behind the ledger. It doesn't matter much if flashing is right or wrong then, the water follows the fastener hole in.

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