New CCA treated wood & hangers

[opie1]

I just had an interesting conversation with a lumber broker friend of mine about the new federal mandated change to treated wood. (CCA) It would appear that the current galv. coating on joist hangers and such is incompatable with the new treatment chemicals and causes some kinda'
reaction that may eventually eat up the hanger. He said Simpson was already
working on a new process and would have the updated product out soon. He said to watch for good buys soon on the old hangers as companys try to change over. I don't know whether this is just here in the rainy NW or is nationwide. Rich, got any contacts??

[Rich]

From my understanding that is kind of a myth. Not a myth that the new pressure treated wood, or any treated wood, will eventually react with the typical simpson hangers or galvanized hangers. A myth that simpson is going to change the whole process of creating hangers. The pressure treated lumber industry specifically recommends using stainless steel hangers with pressure treated lumber.
I guess my question is how often are hangers used for pressure treated lumber? I've rarely used them except in situations where an owner has requested using PT wood on an exterior deck. And if done correctly I can get away without using any hangers at all.
So in answer to your question - yes Simpson is looking at other metods of fabricating a "new" type specifically for PT wood - but they will continue to make the standard galvanized and standard steel hangers. So don't look to get any cheap prices on hangers. Of course that's my opinion.

[opie1]

I thought I'd heard that a while back, like when they last changed the PT
chemicals. I've had two occasions to go back and remodel decks I'd previously done, one I'd done just when hangers where becoming popular, and didn't notice any deterioration of the hangers used on the post and beam and with using CCA .60 (ground contact) treated material. Both decks were
in very exposed conditions, which here in the NW says a lot, so it must take
some real adverse conditions for them to deteriorate.....