Deck Ledger board flashing causing standing water

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Old 07-23-18, 06:47 AM
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Deck Ledger board flashing causing standing water

We Attached the 2x10 PT ledger board to the concrete for the decking. Next we added flashing and caulking to seal it, to keep water from running behind the ledger where itís attached to the concrete.
Its been raining daily here so we havenít been able to lay down deck boards yet but itís given us time to see that the area between the stringer boards on the concrete slab now collect water when it rains.
What can be done to get water to drain from this area now?
 
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Last edited by LHowells-77; 07-23-18 at 07:37 AM. Reason: added photo
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Old 07-23-18, 07:36 AM
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Photo shows where standing water is collecting from edge of flashing to about 12" of the 2x4 boards. These boards are there to attach deck boards to.
 
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Old 07-23-18, 07:40 AM
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There is not much point in even HAVING a flashing in a situation like that... it serves no purpose if the flashing itself isn't counterflashed. You should have omitted the flashing and put a stack of washers behind the ledger to space the ledger away from the concrete so that it could drain.
 
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Old 07-23-18, 07:41 AM
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There is not much point in even HAVING a flashing in a situation like that... it serves no purpose if the flashing itself isn't counterflashed. You should have omitted the flashing and put a stack of washers behind the ledger to space the ledger away from the concrete so that it could drain and dry.
 
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Old 07-23-18, 07:56 AM
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so at this point what can be done?
 
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Old 07-23-18, 08:32 AM
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So at this point what could be done to keep the boards on the concrete from rotting?
* Would I need to take down all the joist, remove expansion bolts from ledger board that are holding it attached to the concrete, add spacers and reattach the ledger and then the joist? And I'm going to assume that these sleeve anchor expansion bolts are NOT removed easily, and mostly it damages the concrete when removing.
If doing that method, is there really any need for flashing between the concrete and the ledger board? How much space needs to be between the concrete edge and the ledger attached to it for it to be "enough" drainage area to properly dry.
 
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Old 07-23-18, 09:54 AM
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Little late now, but none of what you have done so far should have been built that way!
Those 2 X 4's and the decking are going to rot and mold up because there's no air flow under them to dry them out.
Even composite deck requires air flow.
 
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Old 07-23-18, 11:20 AM
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Correct. You would need to remove the ledger, and if your bolts are not long enough to slip a 5/8" nut or a stack of washers on, and still reuse them then you would need to grind them off, epoxy over them and drill new holes for longer bolts. And stay away from the old holes by several inches.
 
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Old 07-23-18, 11:40 AM
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I understand things arenít done correctly so Iím trying to fix that now before putting deck boards down.
I found these 5/8 spacers from Home Depot, would these be appropriate to use between the ledger and concrete?
And for the PT 2x4 sleepers against the concrete, if the water can now drain near the ledger board edge, what can be done to help the 2x4 dry out for ventilation?
https://www.homedepot.com/p/Deck2Wal...L100/302438899
 
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Old 07-23-18, 12:08 PM
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I would not worry too much about the sleepers. Your treated wood better be rated for ground contact. I find it is easiest to hang a big 3/4" nut on each anchor as a spacer. Those spacers would work great. What's going to happen eventually us you will get leaves and dirt building up behind the ledger. If you give it some space at least it can drain out.
 
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