Waste stack in garage

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Phil P.

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Hello plumbing pros :) I'm back with a bigger project and always appreciate your generous advice. First question is I'm adding a garage to my house with bedroom and bath above it. Most logical, simple way to route waste is down along inside garage wall and then connect to main drain. Garage is un-heated, with living space above. I'm in mild/moderate climate (Wash DC area) so not super cold, but want to know if this is bad idea having DWV piping in an unheated garage. I actually don't ever expect garage to freeze (insulated walls, etc) but code- or best practice-wise any issues? (all the actual drains, p-traps, etc will be in the insulated area between garage ceiling joists--just asking about main 3" waste stack). Thanks .. Phil
 

Sylvan

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As long as you do not have a stoppage in an ingested space you should be all right
 

Terry

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Waste lines in an unheated garage should be fine. Water lines will need some care, sounds like you have that handled.

 
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jadnashua

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If the line ends up in a position where it could be hit with your vehicle, you should install some protection for it.
 
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