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Old 02-17-2010, 09:56 AM   #1
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need some help on code compliance


a friend is going to re-do his drain plumbing as it is currently leaking (yuck) and I am sure I will get drafted to help. I am a fair to decent plumber but I really want to make sure his house is code compliant and is done properly.


I need to find the plumbing codes for Michigan and hopefully some general advice/assistance.

this is a single story with basement.

First question; are AAV's legal for kitchen or bath sinks in MI? Any specs for placement to be concerned with?

It looks like they place a vent on the tail end of the underground plumbing (main line out to city sewer) but no other vents in the system.

that's right, no proper vent on stool, sinks, tub/shower, nothing.

anybody have a good source for a decent pictorial of a proper system, hopefully with some spec's.

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Old 02-17-2010, 10:05 AM   #2
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need some help on code compliance


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a friend is going to re-do his drain plumbing as it is currently leaking (yuck) and I am sure I will get drafted to help. I am a fair to decent plumber but I really want to make sure his house is code compliant and is done properly.


I need to find the plumbing codes for Michigan and hopefully some general advice/assistance.

this is a single story with basement.

First question; are AAV's legal for kitchen or bath sinks in MI? Any specs for placement to be concerned with?

It looks like they place a vent on the tail end of the underground plumbing (main line out to city sewer) but no other vents in the system.

that's right, no proper vent on stool, sinks, tub/shower, nothing.

anybody have a good source for a decent pictorial of a proper system, hopefully with some spec's.
Contact your township and county. Even within Michigan, codes will vary.

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Old 02-17-2010, 10:32 AM   #3
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need some help on code compliance


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Contact your township and county. Even within Michigan, codes will vary.
I will check that but I believe we prescribe to the state code without alteration in this area.
thank you
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Old 02-17-2010, 09:13 PM   #4
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need some help on code compliance


AAV's are legal here in oregon, but like he said codes vary, and depending on the inspector, he might not allow them anyway (ours doesn't). Most things like that come in where structural conditions preclude the installation of a standard system.... and 99.9% of the time if you are a good plumber you will find a way to do it.

Anyway, as far as placement, you want them as high up as you can possibly get them, preferrably ABOVE the flood level rim of the fixture they're serving. That way if it gets stuck open, and you get a backup, it will come out of the fixture before it comes out of the AAV, which you shouldn't have to worry about.

Personally I don't like them, simply because code on venting requires airflow throughout the entire system. AAV's simply do not provide this.
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Old 02-17-2010, 09:41 PM   #5
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need some help on code compliance


thanks, I appreciate the input.

the reason for the AAV's is this is not a remod. All of the drainage is accessible without opening any walls from the basement so if AAV's are acceptable (yes, I know, I have to check for my area), it would help a lot.

I still have the stool and bath/shower to deal with but they are on a common wall and right next to each other so that will minimize and wall opening, if needed at all.. With any luck, I will be able to "fish" that one wall.

The bath and kitchen sinks are on different walls


thanks again for the input.
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Old 02-19-2010, 10:09 AM   #6
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need some help on code compliance


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I will check that but I believe we prescribe to the state code without alteration in this area.
thank you
Still depends on what the state code is. The IRC allows AAVs; the UPC does not.
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Old 02-19-2010, 10:39 AM   #7
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need some help on code compliance


thanks.

I'll have to do some checking on what code is applicable.

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