Bill

Why the high loop above the sanitary tee at the trap? Cant it be lower, or is that the thing to do, extend the "Loop" as high up under the sink top as you can get it to go?

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Virginia Plumbing Codes
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Killertoiletspider

You want to extend the vent as high in the cabinet as you can to prevent waste from entering the vent in case of a blockage.

Bill

Makes sense, thanks!

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905.3 ...... Vents less than six(6)
inches(152mm) above the flood-level rim of the
fixture shall be installed with approved drainage
fittings, material, and grade to the drain.

You allready mentioned the requirement for a cleanout on the vertical vent riser but I noticed that medium sweep 90 on the vent just before it rises vertical.

A code violation according to the UPC and inforced in my area.

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Ron

Not sure why it's not showing in my code, but it used to say type of fitting you can use on change of directions, all I know is how it's been done, and it's still being done today. So yes in reality it's not being done to code, I'll ask next time I see an inspector.

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WestCoastPlumber

For the record, the picture was for reference, it may or may not be code in your area. we have to do our island vents this way, except for the couple things i mentioned in my original post about the cleanout in the wall, on the vent, and the santee being a wye 1/8th.

this picture gave a good example, except for the few code changes that need to be done.

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Robert

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3KP

Here we can just stub up an 2" line through the bottom of the cabinet. In certian county's there are different rules. every county allows us to stub up 2" bu tin one county we have to install studer vent. in other countys put a 2" 90 with 2x 1 1/2 bushing in it. Code can be taken in so many different ways.

Here is a code that is quite broken here. In my Code book Table 7-5 DFU's chart it show that on a horizontial 1 1/2 can only have 1 dfu how many dfu's is a tub/shower unit??? According to my book it's 3 units SO how does this pass? There is another situation but I can't remember it right now.

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Bill

I always thought that any floor drain shall not be less than 2", so if a shower is considered a floor drain then it should have to be 2" waste line. AND I thought the code also says you can not reduce the size of the drain going downhill, and most showers I install have a 2" drain, so that means one would have to install a 2x1-1/2 flush bushing or reducer coupling, thus reducing the size as it flows downhill. And a tub/shower combo is a tub so to speak so the 2" rule does not apply to the tub. But then again, there is much more volume of water coming out of a tub than a shower, so I would had thought the tub should have a 2" drain. betcha the water would run out real quick that way!

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Ones intellect can often be summed up by his own words

Everything in the known universe is governed by "Cause and Effect", there is no getting around it. Think about what you do before you do it.

GrumpyPlumber

USP, you're diagram with the red dot shows a san tee connecting to the vertical portion of the bow, I think your inspector is on drugs buddy!

Robert / Westcoast's picture is a great display of a good bow vent / island sink.

As for the vent, we have to use combo's on all vents vertically connecting to a horizontal run.

A good way to look at it is if a small twig just long enough to not make the radius of a shortsweep falls into the external VTR, it will stop and rest in the horizontal run...leading to a clog.
It could also happen on a combo, but at least a combo gives a wider radius.

22rifle

I understand a combo for any vent connecting to a horizontal drain.

What I don't understand is a combo for a horizontal vent connecting to a vertical line. In fact, I think it's dead wrong.

A san-tee in the vertical position is definitely a drainage fitting just as a regular 90 is when used from horizontal flowing into a vertical pipe.

What am I missing guys?