Posted by Hill on December 12, 1997 at 06:02:58:
In Reply to: Kitchen Vent Questions posted by Myron Maurer on December 12, 1997 at 04:47:11:
YES, YOU CAN TIE THEM TOGETHER UPSTAIRS - REALLY TWO 2" AND ONE 1 1/2" FROM THE KITCHEN OR CLOTHES WASHING MACHINE WOULD DO IT - YOU DO NOT HAVE TO HAVE A 3".
YOU CAN DRAIN THE DISHWASHER INTO THE GARBAGE DISPOSAL. YOU WILL NEED TO RUN THE DWM DRAIN INTO AN AIR GAP THEN TO THE DISPOSAL. IT'S EITHER THAT - OR VENT AND TRAP AND USE A JOHNSON TEE IN THE WALL. HERE IS A QUICKIE PIX OF THAT.
HILL
: Upon browsing the Internet, I felt compelled to ask a couple of question pertaining to the DWV requirements for our new residence in Michigan. Our city operates under the '91 Uniform Plumbing Code. My specific questions are as follows:
: 1. To compute specific soil and vent pipe sizes, I computed the dfu's for each respective fixture/stack. Upon doing so I further calculated that we would need to terminate (2) vent stacks above the roof. The pipe sizing table (Table 4-3) in the '91 UPC suggests I only need (2) 2" vent stacks. The asterisk on the sizing table, however, indicates that the cross-sectional area of ALL vent stacks (A=6.28) terminating through the roof must equal or exceed the cross-sectional area of the 4" building drain (A=12.57) entering our home. Therefore, I assume I must now vent (2) 3" stacks through the roof to meet code. Our exterior walls are 2" x 4" studded walls and I would REALLY like to come through the subfloor with a 2" vent stack upon draining each fixture and then use a 3"/2" reducer in the attic to meet the venting requirements. Is it acceptable (i.e. code) to use a reducer in the attic to meet the venting code?
: 2. Upon using the pipe sizing table, I also computed that in our kitchen we would need a 1 1/2" stack vent to vent the kitchen sink and dishwasher. The kitchen layout, however, is such that the sink and
: dishwasher are in an "angled" bar layout. I am within the allowable 3' 6" developed length to vent the kitchen sink (2 dfu) on the vertical soil stack, however, I do not know what the requirements are, if any, to vent the dishwasher. I ASSUME that since the flexible hose from the dishwasher connects through the garbage disposal/sink that it, too, may be vented with the sink stack vent (i.e. vertical soil stack)? If not, I will now exceed the 3' 6" allowable distance from the soil stack.