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Laying septic line using a bubble level.....

Laying septic line using a bubble level.....

#1
11-17-05, 02:43 PM
MikeJ
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Laying septic line using a bubble level.....

Ok I may be thinking it is a lot more technical.....

I am laying a septic line to a tank. I know it is supposed to fall about 1/8 to 1/4 inch per foot (or 1 1/4" to 2 1/2" per 10' pipe).
Now using a bubble level how would I measure that.

I have been told that if you place your thumb (width wise) under the low side of a 4' bubble level and it registers as level then it is ok, but that seems it would only be a 1" fall for the 10'.

My main question is, when I am using a 4' bubble level and it shows a 1 1/2" fall is that for the 10' pipe or is that just for the 4' level???

Or do I have to calculate it like a 1" fall over 4' would come out to 2 1/5" for ever 10'??? This sounds right at first but seems completely faulty... Maybe I am just very tired...... ARrrrg.

Mike

#2
11-17-05, 02:52 PM
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Join Date: Jul 2003
Location: Eastern USA
Posts: 948
Originally Posted by MikeJ

My main question is, when I am using a 4' bubble level and it shows a 1 1/2" fall is that for the 10' pipe or is that just for the 4' level???
That would be 1 1/2" over the length of the level, so its 4'. You would be dropping 3 3/4" over 10' or 7.5" over 20'.

#3
11-17-05, 03:17 PM
MikeJ
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Ok so then if I just bring the 4' level to a 3/4" rise then I will be on the average of 1/8" and 1/4" (average 1 7/8").

#4
11-17-05, 03:18 PM
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Join Date: Aug 2005
Location: Baltimore County Maryland
Posts: 2,002
Level

Lets do it this way, if you want a pitch of 1/8 in. per foot you take the pitch times the length of the level [in feet] that comes out to 1/2 inch, [1/8 x 4] put a 1/2 shim on the downside of your level and you are set. I assume that you are running plastic, this pitch is only good for the length of the level, set one 4 foot section and proceed to the next 4 foot section. Its always the same, pitch times length of the level, i.E. 18 in. level [1 1/2 ft. x 1/8 in. = 3 /16. Hopes this helps.

#5
11-17-05, 03:22 PM
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Join Date: Jul 2003
Location: N.E. Arkansas
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4 foot level @ 1/4" per foot = 1" from end to end of level. Put a 1" block at one end of the level and when it reads level, you have your correct pitch. Good Luck.