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Old 03-26-2008, 12:29 PM   #1
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waste pipe leveling issue


back to my shed construction planning.

the 3" DWV that i decided to run from the shed will tie into the basement of the house. the shed is about 30 ft away from where the pipe will be entering into the basement under the foundation (that will be a little caving expedition). the shed is flush with the first floor.

the question here is: how should i handle the drop in elevation (and possibly minimize digging) ?

some ideas:

1. run the main waste line some 3 ft under the shed slab. use NORMAL GRADIENT and then, when the pipe reaches to the house, make a sudden vertical drop to get it down to under the foundation. was thinking a regular 90 deg elbow on top and a long bend 90 deg on the bottom.

2. run the main waste line some 3 ft under the shed slab but then use INCREASED GRADIENT (perhaps 20-30 deg) to pitch it exactly to the entry point under the foundation, i.e. a gradual and even descent.

3. something else

i think 1. is the solution but what do you all think ?

thanks,

- a -

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Old 03-26-2008, 02:05 PM   #2
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waste pipe leveling issue


As long as you have at least 1/4" of slope for each linear foot of line from the shed to the main drain, you're good.
If you need to drop it at the end, I would install a clean-out above that drop.
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Old 03-26-2008, 02:17 PM   #3
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waste pipe leveling issue


clean-out even if the pipe will be buried ? would you somehow make that clean-out accessible above ground ?
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Old 03-26-2008, 03:36 PM   #4
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I would use two 45s to drop instead of two elbows. That makes a stoppage much less likely. Yes the clean out would be located above ground.
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Old 03-27-2008, 09:50 AM   #5
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waste pipe leveling issue


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IYes the clean out would be located above ground.
if the top of the drop will still be some 3 ft underground, how do i do this ?

should i have a clean-out opening on top right before the drop and then another piece of pipe coming to the surface perpendicular to the line and parallel to the drop ?
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Old 03-27-2008, 04:35 PM   #6
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I would use two 45s to drop instead of two elbows.
isn't it the same as using a long bend elbow ? looks like it pretty much bends around the same radius.
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Old 03-27-2008, 04:53 PM   #7
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waste pipe leveling issue


I'd use two 45's as well. The "flow" may not have much momentum after it get's down there, so it could clog on the 90. I'd use 45's and then don't worry about the clean-out (as long as you can clean it from some other way anyway with a snake if necessary).
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Old 03-27-2008, 04:55 PM   #8
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Looks like this.
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Old 03-27-2008, 05:04 PM   #9
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waste pipe leveling issue


makes perfect sense. thanks gents !
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Old 03-27-2008, 05:12 PM   #10
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waste pipe leveling issue


A mid line clean out would be a wye cut into it the line then a 45 immediately after the 4 so the line would come straight up. You then put a rubber cap on it then have it stick up, flush with the ground, in a box under the ground, or even bury it if you like (you'll have a hard time finding it though).
If you choose not to do this make sure you have a clean out right before it exits the shed. Your average snake is 50ft, if your line is longer than that it's a good idea to have a clean out in the middle of the line. If it's longer than 100ft you should defiantly put one in the middle.


Last edited by Marlin; 03-27-2008 at 05:15 PM.
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