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Oakdale, Mn
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Springfield, NJ
Posts: 1212
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 Deck ledger flashing question
[#2] Posted: 07/24/2011 - 2:01:03 PM |  |  |
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Look here:
http://www.awc.org/publication...6-09.pdf
Page 10 and Figure 14 should help.
Based on the direction of the deck boards it seems that the structure is running parallel to the building and the board you are concerned about is just a deck joist.
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Steven C. Hockstein, AIA
www.AHMArchitects.com |
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Oakdale, Mn
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Deck ledger flashing question
[#3] Posted: 07/24/2011 - 2:59:26 PM | | |
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Hi Steve, thanks a lot for the info.
I was looking at the deck more closely before you replied and was thinking it was strange that the boards ran perpendicular to the house (not parallel), and that the under side of the deck was built a bit differently than I remember seeing on other decks in the past.
After looking over the document you referred me to, I now see that it is a 'Free Standing' deck. This makes a lot of sense, as it is attached to the house at an overhang (see page 12 figure 18). Due to this, there are additional pillars to support the vertical load.
Symantically speaking, I think you're right in that the board in which the lag bolts attache the deck to the house is technically called a rim joist - however it appears that I either have a rim joist that is made out of two 2 bys or 1 rim joist and 1 ledger board.
At any rate, the flashing does not cover the full depth of those boards. I took one of the lag bolts out and it appears to be 6" in length and goes 2.25" into the house (past interface of ledger board and homes exterior).
That said and the fact that page 15 figure 23 indicates that the flashing should cover the entire depth of the board makes me still concerned and therefor my original questions still stand.
I hope I'm not being confusing.
Here are some additional pics of the house.
Thanks again!
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Friday Harbor, WA
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Deck ledger flashing question
[#4] Posted: 07/24/2011 - 2:59:57 PM | | |
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That's an unfortunate headache. They flashed the ledger, but then nailed a joist right to it. Water will get in between the two pieces and start rotting them out. Fix it now or fix it later. What I might do it to remove all the screws and the ends of the decking, remove the unflashed joist from below, re-install the joist with spacers (probably 3/4" thick PT or maybe PVC trimboard), and then re-screw the decking through new holes. The air gap between the two boards will prolong their life.
Steven's link above also shows a good detail. You would probably need to remove some siding to do it, and you would need to be able to slide the flashing in from the end... or else just remove the decking completely to install it.
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Oakdale, Mn
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Dallas, GA
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Deck ledger flashing question
[#6] Posted: 07/24/2011 - 6:29:27 PM | | |
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If this were my house I'd see if I could get a look at the bolts at the interior to determine if there has been any past moisture entry. If I didn't see any signs of moisture intrusion I'd just leave it like it is.
It has four supports under two beams that support all of the joists.
This deck is self supporting and the bolts only keep it anchored to the house.
The big concern with bolts and flashing is when the bolts are the only support at the house attachment which is what I see most of the time here in the south. In that case if the bolts fail the deck falls.
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| Tim M. |
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Springfield, NJ
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Deck ledger flashing question
[#7] Posted: 07/24/2011 - 6:32:11 PM | | |
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Diagonal bracing?
Tie Downs?
Get someone that knows about decks to take a few hours to make it safe and secure. Should not cost too much.
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Steven C. Hockstein, AIA
www.AHMArchitects.com |
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