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02-23-2012, 09:11 PM   #1
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## 1/4 inch per foot equals ???

Hi everyone.

I know my 3 inch horizontal drain has got to be at a 1/4" per foot

My question is..

What would 1/4" per foot be equal to in degrees ?

I've looked on the internet for this answer and I havent had much luck. Your help is appreciated.

02-23-2012, 09:12 PM   #2
Concrete & Masonry

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It's extremely close to 2 degrees........

02-23-2012, 09:27 PM   #3
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Quote:
 Originally Posted by jomama45 It's extremely close to 2 degrees........

I wanted to clarify the distinction between the "2%" usually referred to with longer runs and larger pipes vs the 1/4" P/LF usually referred to with shorter runs and smaller pipes.

eg: When I trench to re-route 70 linear feet of 4" main/waste pipe I'm told I can use 2% (70x12 x .02) or 16.8" because I will dearly need that 3/4" (vs 17.5").

 02-23-2012, 09:32 PM #4 Concrete & Masonry   Join Date: Nov 2008 Location: Wisconsin Posts: 3,405 Rewards Points: 470 EDIT: After reading "Tarheel's" response, I realize I made a mistake. 1/4" per foot pitch equals 2%, NOT 2 degrees. I can't give you the exact answer off of the top of my head, but I'd say it's likely just under 1 degree....... Hopefully someone else here can give you a better answer.
 02-23-2012, 09:44 PM #5 GC/Master Plumber/Mech   Join Date: Feb 2009 Location: Hays, KS Posts: 1,500 Rewards Points: 560 One degree could be equal to any length depending on how far from the point of origin you are making a measurement. It is not normally a function of length. One degree can be broken down into 60 minutes or 360 seconds. __________________ John Wayne once said "Life is tough and it is even tougher if you are stupid" Tempstar and Trane Dealer
02-23-2012, 10:04 PM   #6
jschaben

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Quote:
 Originally Posted by kevin705 Hi everyone. I know my 3 inch horizontal drain has got to be at a 1/4" per foot My question is.. What would 1/4" per foot be equal to in degrees ? I've looked on the internet for this answer and I havent had much luck. Your help is appreciated.
Hi Kevin: works out to 1.2°. It would be the inverse tangent of .25/12 but I just drew it out in DeltaCad and let it figure out the math
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John Schaben

"Where all think alike, no one is thinking very much"

 02-23-2012, 11:40 PM #7 Newbie   Join Date: Feb 2012 Posts: 4 Rewards Points: 10 Thanks for the answers. If your curious , any levels that I can find find have an auto adjust for the degrees. And for this length of pipe it'll be helpful to know what I can set it at. Thanks Again.
02-24-2012, 12:00 AM   #8
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Quote:
 Originally Posted by kevin705 And for this length of pipe it'll be helpful to know what I can set it at.

If Point "A" = X" (below some known grade level or such)...
then Point "B" 100 linear feet away MUST be 24" shallower than X.
(100 x 12" x .02)

For the 1/4" P/lf method... 100' x .25" per = 25" shallower.

If you don't have a transit...
try some clear vinyl hose with water in it.

http://www.deckmagazine.com/article/64.html

02-24-2012, 12:18 AM   #9
Doing it myself

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Quote:
 Originally Posted by jschaben Hi Kevin: works out to 1.2°. It would be the inverse tangent of .25/12 but I just drew it out in DeltaCad and let it figure out the math

To be a little more accurate :

1.193489423982035

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Journeyman Plumber

 02-24-2012, 08:27 AM #10 Member   Join Date: Jan 2012 Location: ohio Posts: 1,154 Rewards Points: 616 go to home depot and buy a husky plumbers level it has 1/8, 1/4, 3/8, rise marks on it just make sure you use it right or your pipe will be going the wrong way http://www.homedepot.com/Tools-Hardw...&storeId=10051 __________________ "be careful at listening to just one persons advise" said me "be careful at listening to just one persons advise" said myself p.s. not all i say is a fact but not all i say is my opinion.
 02-24-2012, 09:03 AM #11 Member   Join Date: Jul 2010 Posts: 2,081 Rewards Points: 22 Tape a shim (1" in this case) on one end of a 4' level.
02-24-2012, 09:09 AM   #12
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Quote:
 Originally Posted by jaydevries go to home depot and buy a husky plumbers level it has 1/8, 1/4, 3/8, rise marks on it just make sure you use it right or your pipe will be going the wrong way http://www.homedepot.com/Tools-Hardw...&storeId=10051
Or, I've seen guys take a 4' level and tape a 1" block to the end of it.

edit: ^^^ he beat me.

02-24-2012, 07:49 PM   #13
KemoSabe

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I have two different sizes of these levels. They convert from degrees, % and ?/12(for roof pitch). A little fun and you can convert anything you want.

http://www.sears.com/shc/s/search_10...el%20craftsman

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