Water heater flue in tight space

If it’s brick veneer, which most likely, the deck cant be secured through the brick. It won’t have the sheer strength, and brick veneer is not structural. Even if lag bolts go directly to the rim joist, it would pull the brick to the framing, closing that void between the two.
It would likely need to be free standing.

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Reasonable recommendation based on the risks.

However, this has been allowed for a long time and only recently changed in many jurisdictions. It is not an automatic call-out for many inspectors.

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Interesting. To be honest, I never actually see this here. Decks are kinda rare, and when I do see them, it is at wood framed walls. But they are almost always missing flashing and hangers.

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Lol, apparently that is universal!

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Lots of other good info on the thread but I wanted to comment on this - the longest, most heated thread I’ve ever encountered on an HI forum dealt with this exact issue. It was on “Inspectionnews” and I want to say it was 15-20 years ago. Guys argued for pages about code saying 12" rise at the top of the tank before a bend vs. manufacturer specs NOT specifying it (or maybe it was the reverse of that). Anyway, my takeaway was that I don’t fight about it. I regularly see vents taking 90 degree bends right above the tank and as long as other things are okay (upward slope, termination, etc,) I don’t comment.

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Attaching a deck ledger board to brick veneer may have been “allowed” buy some jurisdictions, that doesn’t make it right. I always report it one way or another. Similar to what you said it may have been allowed, but the consequences and recommendations for correction, for safety. Note: It is not presently allowed, at least in my area, and hasn’t been for many years.

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