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Old 06-09-2013, 09:32 AM   #1
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Ledger board flashing


Just put a ledger board on my house to attach decking to.

After removing the siding I added a piece of aluminum flashing between the ledger board and the house wrap.

One of my coworkers mentioned there was a problem with flashing deteriorating because of electrolysis between the flashing and the chemicals in the pressure treated wood.

Flashing is powder coated.

Is the flashing OK to leave up,or should I take her down???

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Old 06-09-2013, 09:42 AM   #2
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Ledger board flashing


Aluminum in any form should not be used.
You need something like copper, rubber, or vinyl,

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Old 06-09-2013, 10:17 AM   #3
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Ledger board flashing


There should be, in an ideal application, some sort of separation between the two pieces.

The aluminum is not powder coated but does have an enamel paint on it. That being said, the galvanic corrosion will still happen (albeit at a much slower rate than if it were uncoated) where the water in contact with the two will mix and at the fastener locations.

We do use coated aluminum in some cases but only after putting some sort of isolation between the two.
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Old 06-09-2013, 11:07 AM   #4
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Ledger board flashing


The top flange goes under the house wrap. If the aluminum is painted, I think you will be fine. I use pressure sensitive EPDM though, as ACQ really attacks Aluminum.
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Old 06-09-2013, 11:17 AM   #5
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Ledger board flashing


pick yourself up a 4" roll of grace vycor or blueskin.. run a strip of it on the top edge of the ledger then install the aluminum flashing.. this is all thats needed to break the contact between the two materials.. basically what happens otherwise is that the aluminum will slowly turn to ash.. ive seen it a few times its not pretty
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Old 06-09-2013, 02:08 PM   #6
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Ledger board flashing


Thanks for everyones input,I guess I'll be pulling that mother off tommorow a.m.

Better now than after I put the joists up!!!
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Old 06-09-2013, 03:25 PM   #7
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Ledger board flashing


A good article on this....

http://www.deckmagazine.com/wood/bey...-flashing.aspx
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Old 06-09-2013, 03:45 PM   #8
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Ledger board flashing


I used galvanized but I still put a layer of 30 lb felt between the two.
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Old 06-09-2013, 04:31 PM   #9
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Ledger board flashing


What's it say in big letters right on the outside of the coil stock?
Do not put in direct contact with pressure treated lumber.
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Old 06-11-2013, 07:29 AM   #10
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Ledger board flashing


Took the ledger board down,removed the flashing and installed flex-o-wrap instead.
As far as directions,maps and the sort,I only consider them a rough guideline and I usually discard assembly instructions immediately upon opening the package.
But thats just me.

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