I am starting in on the rough-in plumbing of my house and would like some real world experience with DFU’s and such when it comes to sizing the drain line for my kitchen and utility room run.
Fixtures – standard kitchen sink, Bosch dishwasher, Bosch clothes washer, utility sink, dog/boot wash/drip pan on one line. Would like to use AAVs to vent to avoid roof penetration on eave of roof on the primary view aspect of the house. Need one 90* turn after all fixtures before main straight run to septic drain stack in basement mechanical room.
I add this up to 10 or 11 DFUs – depending on what online chart I use. I am using Rex Cauldwell’s “Plumbing” book as a reference and FWIW there is no code inspection in my locale. AAVs will go in just as illustrated in the book.
Given this – will a 2″ ABS drain handle this load or am I asking too much. I want to stick with 2″ because it will fit along the ICF basement wall and allow the wallboard to hide the drain line w/o furring the wall or boxing a soffit…
Thanks for your help!!
Replies
I'm not a plumber.
But I found this table on Google; the way I read it, you need 2.5" waste pipe. 2" only gives you 8 units for waste.
Regards,
Tim Ruttan
I'm not a plumber either but here in NC we recently had a code change that requires a 3" drain on all washers. Apparently some of these new, high performance washers were over-running the drains.
Like Matt said once a drain line for a washing machine goes horizonal it should be 3" to meet code here locally [ Ohio ].