How to calculate invert distance

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Yvette Louka

May 13, 2023 00:41

Does anyone know please which of the NCARB resource books have information about invert? I’ve been researching and can’t find this information. Is there a standard slope we should memorize? Thank You 

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  Rebekka O'Melia May 17, 2023 18:23

  Hi Yvette,

  I assume you're talking about waste lines.  It's covered on page 31-27 in Ballast.  1/4" per foot slope is needed, unless the pipe is bigger than 3", in which case it can slope just 1/8" per foot.

  Hope this helps!

  Rebekka O'Melia, R.A., NCARB, B. Arch, M. Ed, NOMA, Step UP ARE 5.0 Courses

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  Pablo Diaz May 17, 2023 20:57

  basically use: Rise / Run = Percentage

  Then rearrange the formula if you need the rise or run

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  Rebekka O'Melia May 17, 2023 21:37 (Edited May 17, 2023 21:39)

  Hi Yvette,

  I assume you're talking about waste lines. It's covered on page 31-27 in Ballast. 1/4" per foot slope is needed, unless the pipe is bigger than 3", in which case it can slope just 1/8" per foot.  So the math is .25”/12”

  Hope this helps!

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  Yvette Louka May 17, 2023 21:42

  Thank you Pablo and Rebekka.

  I found in one book that it is 1/8" / ft and it is calculated to the inner bottom side of the pipe.

   

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