Stacked bathrooms

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Plumber69

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two bathroom sink toilet stack. Had to plumb this way cause of steal beams
 

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Terry

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The lav will wet vent the toilet. In the US, that's done with 2" as long as their is a composite 3" out the roof. That would be two 2" vents and one 1.5" vent. The kitchen sink location is normally the 1.5" vent.
 

Plumber69

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The lav will wet vent the toilet. In the US, that's done with 2" as long as their is a composite 3" out the roof. That would be two 2" vents and one 1.5" vent. The kitchen sink location is normally the 1.5" vent.
I just tee'd the 2" pipes together and one through the roof, i heard in large cities that 2" isnt enough and it sucks p traps dry..... and kitchen sink is on other side of building, theres 2 sewer outlets
 

Terry

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I just tee'd the 2" pipes together and one through the roof, i heard in large cities that 2" isnt enough and it sucks p traps dry..... and kitchen sink is on other side of building, theres 2 sewer outlets

In Washington State I can vent three bathroom groups with 2"

This is two bathroom groups done with 2"

dwv_b2.jpg
 

Reach4

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In at least some cold areas, there is a requirement for bigger pipes through the roof. I think this may be to allow for a coating of ice inside of the pipe that would reduce the effective diameter.
 

Terry

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In at least some cold areas, there is a requirement for bigger pipes through the roof. I think this may be to allow for a coating of ice inside of the pipe that would reduce the effective diameter.

And that would be "through" the roof, not before.
On the West side of the Cascades, they don't make us do that.
 
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