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Old 07-26-2015, 03:52 PM   #16
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Originally Posted by slowmotion View Post
Just a crawl below so no other lines. If I reduce the vent to 1.5" below the top plate, at what point do I transition back to 2"?
If you can access it, I would go back to 2" in the vertical section thru the roof.
My electrical answers are based on 2017 NEC, you may have local amendments.

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Old 07-26-2015, 05:52 PM   #17
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So here is what I ended up doing... I reduced the pipe from 2" to 1.5" and made the 90 degree bend. Glad this was recommended because the 2" bend would have been too large to allow the drywall to extend to the corners - it will be tight enough with the 1.5" bend. I tried to hole saw it and you were correct that there was enough play if I could have drilled the hole in the center of the top plate for that to work, but I just couldn't get it to work. I decided instead to go for the notch and have installed a Simpson plate (not pictured) for reinforcement over the opening after installing the pipe.

Thanks for all the suggestions!
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