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Old 01-02-2013, 01:05 PM   #16
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1 foot per 8 feet drop on final leg


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> the code also states while minimum grade is acceptable, increased slope is recommended whenever possible

Now I'm completely confused.

OK let me put it another way. Min according to code for 4" abs is 1/8" per foot. Is there a max according to code? What's your recommendation (opinion) on optimum?
need to be careful how you interpret the code book increased slop on certain applications not all.

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Old 01-02-2013, 01:08 PM   #17
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1 foot per 8 feet drop on final leg


Quote:
Originally Posted by jackwashere View Post
> the code also states while minimum grade is acceptable, increased slope is recommended whenever possible

Now I'm completely confused.

OK let me put it another way. Min according to code for 4" abs is 1/8" per foot. Is there a max according to code? What's your recommendation (opinion) on optimum?
need to be careful how you interpret the code book increased slop on certain applications not all.
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Old 01-02-2013, 08:02 PM   #18
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1 foot per 8 feet drop on final leg


Actually my code excludes the use of cleanouts on horizontal lines that have a slope greater than 72 degrees or less from the VERTICAL angle.

That said, you still need to use the appropriate fittings to make the transition from your original 1/4" per foot. You can't just slap a couple of fernco couplings on it and call it good.
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Old 01-02-2013, 08:07 PM   #19
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1 foot per 8 feet drop on final leg


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Actually my code excludes the use of cleanouts on horizontal lines that have a slope greater than 72 degrees or less from the VERTICAL angle.

That said, you still need to use the appropriate fittings to make the transition from your original 1/4" per foot. You can't just slap a couple of fernco couplings on it and call it good.
I can use a fernco 45 though, right?
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Old 01-02-2013, 08:09 PM   #20
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1 foot per 8 feet drop on final leg


While I agree that there may be some benefit to using minimum grade as maximum grade I have never heard of that before and couldn't endorse it myself. The Great White North code states we should utilize above minimum grade if possible and even rewards us for doing so byallowing us to evade using expensive expansion joints assuming a horizontal run is A) long enough, and B) has excessive grade.

Maximum grade, in my opinion, is completely 100 % vertical, and would be how I would run every branch of piping I could if structure would allow. I'm not sure at what point between a straight drop and a 1/4" per foot slope that grade becomes "non-optimal" before becoming "optimal" again.

Minimum grade, is called "MINIMUM" for a reason, if that's not an accurate title why not just call it "Optimum Grade"?

If it was my home, I'd run it minimum and then use 2, 45 degree bends. If my travel on the 2 bends was short and I had to increase the slope of the main 4" line to line up correctly, I'd do so happily.
I would NOT however connect 2, 1/8" per foot lines with a heavily sloped piece in between bent into 2 couplings.
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Old 01-02-2013, 08:12 PM   #21
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1 foot per 8 feet drop on final leg


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I can use a fernco 45 though, right?
No, just a fernco p-trap. That would give you the obscene amount of slope needed without worrying about getting any sewer gas back up the line if something leaks.


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