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npelzer 12-13-2007 08:42 AM

Toilet drain pipe slope.
i am putting a bathroom in my basement where there is NO piping at all, i have to chisel out the concrete floor and lay new pipes and everything. My biggest concern is what kind of slope do i need from where the toilet is to where the sewage exits my house. I want to make sure that its going to drain out and not backup or plug on me.

ToolGuy 12-13-2007 04:32 PM

The standard in my area is 1/4" per 4' length.

Daryl 12-13-2007 05:50 PM

There are systems now made to allow you to hook up whole bath where pipes don't exist and tie into the exising pipes. Called a macerator(?)

ToolGuy 12-13-2007 06:40 PM

Found it!

glennjanie 12-13-2007 08:38 PM

Welcome Npelzer:
Getting back to your original question; your drain line should have a minimum fall of 1/8" per foot (an 8' line would have 1" of fall from end to end) and a maximum of 1/4" per foot. The pump systems are great but if you have the space to get the proper fall, there is no need to go to the expense.
In a low fall situation all junctions should be made with wyes instead of tees; Y's get the waste flowing in the right direction before they enter the main line.

npelzer 12-14-2007 12:51 PM

thanks guys!!! thats all i needed to know, its about 24" from the top of the concrete to where the sewage pipe leaves the house, so i should easily be able to get that slope! thanks again

glennjanie 12-14-2007 10:34 PM

Congratulations Nathan!
I'm so happy that worked out for you and without the big expense.

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