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Old 06-14-2012, 06:52 AM   #16
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Water leaking into basement through deck


It’s defiantly time to pull that first coarse of siding and the decking against the house to see what’s going on. This is a very common issue and should be easy to figure out once exposed.

I doubt the slider has a pan flashing detail under it and it should so the door may have to come out also. Removing the decking against the house should answer that question.

OP said that he and someone else tried to remove the decking and could not and thought it may be glued. Gluing the board would be unusual but if it was glued to the rim that could be the, or part of the cause of the leak. Either way the board needs to come up even if it’s in pieces.

This thread is three years old, ignoring the issue any longer could be costly.

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Old 06-14-2012, 08:23 AM   #17
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Water leaking into basement through deck


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Originally Posted by danpik View Post
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
That's the other thing. There is no space between the sliding glass door and the deck. The threshold sits right on the first deck board.
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Old 06-14-2012, 11:37 AM   #18
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Water leaking into basement through deck


If you end up re-flashing, you might want to consider this " belt and suspenders" approach:

Deck to Wall Flashing - FEMA
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Old 10-18-2013, 12:25 PM   #19
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Water leaking into basement through deck


I'm pretty much having this same issue with my deck. The bummer is that it's a two tier deck and both the upper and lower part were constructed the same way. We've tried various attempts to stop water leakage over the years and we've had some success limiting the water flow.

This past summer we had a ton of rain and I recently noticed that white mold is now growing in my crawl space where water is still leaking in from the lower deck.

I'm planning to install z flashing on top and below, but I was wondering how to stop water from getting in where the end of the deck meets the end of the house. In other words, where the decking and ledger meet the corner of my home (the outside corner post of the siding).

Picture attached for reference. We obviously used some caulk here, but I'm referring to the gaps where the siding and the boards don't meet up exactly. How do we stop water from getting in there?
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Water leaking into basement through deck-deck_sample.jpg  

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