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LI_Deck_Guy 04-13-2007 01:52 PM

House shingles rotting where outside deck attaches....
 
Hey guys,

The shingles (cedar) on our house are rotting away where our backyard deck attaches to the house. The house is about 25 years old, and the deck is 20 or so. It appears that the ledger board for the deck was bolted right to the house (without any spacers), and it doesn't appear that any flashing was used. The deck boards also butt right up against the house. I assume water is getting trapped between the deck and the shingles, and over 25 years, it rotted them away. If left alone, it looks like the rot will eventually get to the structure of the building. The door jamb of a sliding glass door is also rotting.

We'd like to repair this now before it gets worse. Any ways to fix this but also be able to keep the deck? I'm thinking we need to remove the deck boards that butt to the home, and then somehow remove the ledger which is bolted to the house, in order to remove the rotted shingles. I guess we can cut the joists, maybe cut an inch off of them all, to free up the ledger board. Then, upon reassembly, now that the joists are all in inch shorter, we can use some washers or something to act as spacers so that the ledger no longer touches the home, but isntead there is a little space so that water can run through. I figure this would solve bothes issues - how to remove the ledger in the first place, and then also it would prevent moisture buildup against the house.

Any opinions or experiences would be appreciated.
thanks!

concretemasonry 04-13-2007 02:30 PM

The best way would be to make the deck free standing. This will eliminate the probable future water intrusion into the home structure.

Have you thoroughly checked out your interior studs, sill and joists? If the cedar is rotting the could be hidden damage since the framing is not as resistant as the cedar and it does not have the exposure to dry out. Fiberglass insulation can make it worse.

If you do decide to attach to the house, use through bolts, flashing and a method to prevent leakage around the bolts.

LI_Deck_Guy 04-13-2007 02:34 PM

Quote:

Originally Posted by concretemasonry (Post 40903)
The best way would be to make the deck free standing. This will eliminate the probable future water intrusion into the home structure.

Have you thoroughly checked out your interior studs, sill and joists? If the cedar is rotting the could be hidden damage since the framing is not as resistant as the cedar and it does not have the exposure to dry out. Fiberglass insulation can make it worse.

If you do decide to attach to the house, use through bolts, flashing and a method to prevent leakage around the bolts.

Thanks! How would we make the deck freestanding? I assume we can't just detach it from the house right? It will need some other means of support? Haven't checked the condition of the structure, I figure we can probably see that better once we remove the ledgerboard and the rotted row of shingles.

thanks!

concretemasonry 04-13-2007 04:33 PM

House shingles rotting where outside deck attaches....
 
Going to a freestanding deck would require new posts and footings or Sonotubes and a beam to replace the support given by the ledger. Then ther would be no direct path to the house for moisture.

Depending on the joists, the beam could be 1 or 2' away from the house and parallel to the house to support the joists. Your decking can run up close to the house so there would be no gap.

If you chose to change the support, an engineer can help you.

LI_Deck_Guy 05-20-2008 06:36 PM

The deck has now been repaired, however I have a question about flashing. Flashing was installed such that it goes up behind the shingles but comes out and lays on the deck boards. So it's sitting on top of the decking instead of on top of the ledger board. This makes sense to me in that it should still divert water away from the house and underlying ledger/wall connection. But, everything I've read online says that the ledger is supposed to be flashed. What's the difference, and is this setup we have OK?

Thanks!


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