[Greenbuilding] 2" drain line for a 0.8gpf toilet?

[Reuben Deumling]

On Sun, Apr 24, 2016 at 3:40 PM, Reuben Deumling <9watts at gmail.com> wrote:

> Here's a study that suggests 0.8gpf is pushing things* in a
> *[Edit: 4"]* drainline.
>
> http://www.allianceforwaterefficiency.org/uploadedFiles/Resource_Center/Library/residential/toilets/Drainline-Transport-Study-PhaseOne.pdf
>
>
> * or rather failing to do so reliably
>
> On Sun, Apr 24, 2016 at 3:29 PM, Reuben Deumling <9watts at gmail.com> wrote:
>
>> I have long wondered whether or when anyone would dare diverge from the
>> 3" standard drainline diameter as we get toilets that use less and less
>> water per flush.
>> Interpolating from this chart:
>> http://www.mpwmd.net/rules/Apr2008/pdfs/RegII/rule24_table1.pdf
>> I see that in terms of fixture units, a 0.8gpf toilet is now at 1, which
>> puts it comfortably within the same class as sinks, which as we know do not
>> require anywhere near a 3" drainline. So..... does anyone on this list know
>> if there is any movement toward allowing a 2" drainline for a 0.8gpf
>> toilet? Or whether there's been any testing of this configuration?
>>
>> Reuben
>>
>
>
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